CN106229946A - A kind of ferromagnetic resonance harmonic elimination apparatus and method - Google Patents
A kind of ferromagnetic resonance harmonic elimination apparatus and method Download PDFInfo
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- CN106229946A CN106229946A CN201610680904.2A CN201610680904A CN106229946A CN 106229946 A CN106229946 A CN 106229946A CN 201610680904 A CN201610680904 A CN 201610680904A CN 106229946 A CN106229946 A CN 106229946A
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- harmonic elimination
- sequence current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
- H02H7/05—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers for capacitive voltage transformers, e.g. against resonant conditions
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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Abstract
The present invention is about a kind of ferromagnetic resonance harmonic elimination apparatus and method, wherein, described device electrically connects with the electromagnetic potential transformer in power distribution network, including: power module, resonance judge module, harmonic elimination module summation current transformer, wherein, described power module is electrically connected to described resonance judge module and harmonic elimination module；Described current transformer is electrically connected to the connection wire between described electromagnetic potential transformer neutral point and ground, and described current transformer electrically connects with described resonance judge module；Described harmonic elimination module includes that harmonic elimination resistance and first controls switch, the two ends of described harmonic elimination resistance are connected to the two ends in the open delta loop of described electromagnetic potential transformer, and described first controls switch series is coupled between described harmonic elimination resistance and described open delta loop；Described resonance judge module is electrically connected to described first and controls switch.The device provided by the present embodiment can accurately, quickly eliminate ferromagnetic resonance, improves the harmonic elimination efficiency of ferromagnetic resonance.
Description
Technical field
The present invention relates to power system security Prevention Technique field, particularly relate to a kind of ferromagnetic resonance harmonic elimination apparatus and side
Method.
Background technology
In the power distribution network of 66kV and below 66kV, generally use system neutral earth-free and neutral point through small resistor or
The non-effectively earthed system of grounding through arc, system busbar is connected to monitor the electromagnetic potential transformer of insulation against ground
(Potential Transformer, PT).Because of circuit be struck by lightning, single-phase earthing, conjunction aircraft carrier line operation, load acute variation
And the transient state impact that produces of the reason such as secondary voltage load switching may excite the excitation reactance of electromagnetic potential transformer with
Between system direct-to-ground capacitance, ferromagnetic resonance occurs.Ferromagnetic resonance causes in recent years electromagnetic potential transformer frequent breakage, fusing
The device problem that frequently fuses still annoyings equipment operation maintenance unit, and this type of isolated neutral system or neutral point are through small resistor
Or the non-effectively earthed system (accidentally departing from small resistor or the part of grounding through arc) of grounding through arc easily causes and sets
Standby frequent breakage, increases operation expense.
At present, in correlation technique, the protection method of ferromagnetic resonance for occurring mainly uses: in electromagnetic potential mutual inductance
Neutral point of device installs resonance eliminator additional, or, use install additional in electromagnetic potential transformer residual voltage loop damping resistance,
By installing microcomputer secondary resonance elimination device additional and detecting residual voltage and every phase voltage waveform etc..Wherein, in electromagnetic potential mutual inductance
Neutral point of device installs resonance eliminator additional, i.e. connects resonance eliminator at electromagnetic potential transformer successively neutral point, by resonance eliminator pair
The ferromagnetic resonance produced carries out harmonic elimination.
But, install the mode of resonance eliminator additional at central point of electromagnetic potential transformer, although be prevented from system
The three-phase voltage easily produced over the ground between ferromagnetic resonance, but for the industrial frequency resonance harmonic elimination weak effect that causes of broken string, and easily
The bad phenomenon such as the voltage bringing electromagnetic potential transformer neutral point is raised, electromagnetic potential transformer tail end insulation breakdown,
Cause resonance eliminator ineffective；Installing damping resistance additional can be because damping resistance heating affects harmonic elimination effect；Microcomputer secondary is used to disappear
, because the method for detection residual voltage and three-phase voltage waveform is difficult to differentiate between industrial frequency resonance, there is measure loop and disappear in humorous device device
Humorous loop shares maybe to be needed to detect three-phase voltage problem.
Therefore, by using above-mentioned existing harmonic elimination mode, not only can extend the harmonic elimination time and increase harmonic elimination cost, and
And meeting extreme influence harmonic elimination efficiency, cause equipment frequent breakage, the safe and stable operation of electrical network and equipment is caused serious threat.
Summary of the invention
For overcoming problem present in correlation technique, the present invention provides a kind of ferromagnetic resonance harmonic elimination apparatus and method.
First aspect according to embodiments of the present invention, it is provided that a kind of ferromagnetic resonance harmonic elimination apparatus, is used for eliminating in power distribution network
Ferromagnetic resonance for electromagnetic voltage transformer, including power module, resonance judge module, harmonic elimination module summation current transformer, its
In,
Described power module is electrically connected to described resonance judge module and harmonic elimination module；
Described current transformer is electrically connected to the connection wire between described electromagnetic potential transformer neutral point and ground, institute
State current transformer to electrically connect with described resonance judge module；
Described harmonic elimination module includes that harmonic elimination resistance and first controls switch, and the two ends of described harmonic elimination resistance are connected to institute
Stating the two ends in the open delta loop of electromagnetic potential transformer, described first controls switch series is coupled to described harmonic elimination resistance and institute
State between open delta loop；Described resonance judge module is electrically connected to described first and controls switch.
Optionally, described harmonic elimination module also includes that the second control switchs, wherein,
Described second controls switch is connected with described harmonic elimination resistance and the first control switch in parallel, and described second controls switch
It is respectively electrically connected to the two ends in described open delta loop.
Optionally, described device also includes timer, described timer respectively with described resonance judge module and harmonic elimination mould
Block electrically connects.
Optionally, the Standard resistance range of described harmonic elimination resistance is 0.5-10 Ω.
Optionally, the resistance size of described harmonic elimination resistance is 1 Ω.
The second aspect of the embodiment of the present invention, also provides for a kind of ferromagnetic resonance harmonic elimination method, including:
Judge whether current transformer detects the zero-sequence current between electromagnetic potential transformer neutral point and ground；
When detecting that described zero-sequence current reaches to preset zero-sequence current, reach in calculating the first preset duration to preset arteries and veins
Rushing pulse number and the pulse width of the zero-sequence current of amplitude, wherein, described predetermined pulse amplitude is more than described default zero sequence electricity
The pulse amplitude of stream；
According to described pulse number and pulse width, it is judged that whether described electromagnetic potential transformer occurs ferromagnetic resonance；
When described electromagnetic potential transformer generation ferromagnetic resonance, control the first control being connected with harmonic elimination resistant series
Switch Guan Bi, carries out harmonic elimination process to described electromagnetic potential transformer.
Optionally, reach in calculating the first preset duration described in predetermined pulse amplitude zero-sequence current pulse number and
Pulse width, including:
When detecting that described zero-sequence current reaches to preset zero-sequence current, start the first timer, start timing；
The zero-sequence current in the first preset duration of described timing is gathered by current transformer；
Search the pulse amplitude zero-sequence current more than or equal to predetermined pulse amplitude；
Calculating pulse amplitude is more than or equal to pulse number and the pulse width of the described zero-sequence current of predetermined pulse amplitude.
Optionally, it is judged that whether described electromagnetic potential transformer occurs ferromagnetic resonance, including:
Judge the pulse number of described zero-sequence current whether more than 6, whether pulse width more than 3ms；
When the pulse number of described zero-sequence current is more than 6 and pulse width is more than 3ms, determine described electromagnetic potential
Transformer generation ferromagnetic resonance.
Optionally, when controlling the first control switch Guan Bi being connected with harmonic elimination resistant series, described method also includes:
Start the second timer, start timing；
Judge in the second preset duration, whether the pulse amplitude of described zero-sequence current is reduced to described default zero-sequence current
Pulse amplitude below；
Time below the pulse amplitude that described zero-sequence current is not reduced to described default zero-sequence current, control described first control
System switches off, and the second control switch controlling to electrically connect with the open delta loop of described electromagnetic potential transformer closes
Close, so that the open delta loop short circuit of described electromagnetic potential transformer, eliminate the ferromagnetic of described electromagnetic potential transformer
Resonance.
Optionally, switch when the second control controlling to electrically connect with the open delta loop of described electromagnetic potential transformer
During Guan Bi, described method also includes:
Start the 3rd timer, start timing；
The pulse amplitude of zero-sequence current described in real-time judge whether be reduced to the pulse amplitude of described default zero-sequence current with
Under；
Below the pulse amplitude that the pulse amplitude of described zero-sequence current is not reduced to described default zero-sequence current and described
When 3rd duration of timing reaches three preset duration, control described second and control to switch off；
When controlling described second control switch off-time and reaching four preset duration, again control described second and control
Open
Close Guan Bi, until the pulse amplitude of described zero-sequence current is down to below the pulse amplitude of described default zero-sequence current.
The technical scheme that embodiments of the invention provide can include following beneficial effect:
The embodiment of the present invention provides a kind of ferromagnetic resonance harmonic elimination apparatus, and described device is mutual with the electromagnetic potential in power distribution network
Sensor electrically connects, and concrete, described device includes power module, resonance judge module, harmonic elimination module summation current transformer, its
In, described power module is electrically connected to described resonance judge module and harmonic elimination module；Described current transformer is electrically connected to described
Connection wire between electromagnetic potential transformer neutral point and ground；Described harmonic elimination module includes that harmonic elimination resistance and first controls to open
Closing, the two ends of described harmonic elimination resistance are connected to the two ends in the open delta loop of described electromagnetic potential transformer, described
First controls switch series is coupled between described harmonic elimination resistance and described open delta loop；Described resonance judge module is electrically connected to
Described first controls switch.
The embodiment of the present invention provides supply voltage by power module for resonance judge module and harmonic elimination module, and by electric current
The zero-sequence current of transformer detection electromagnetic potential transformer open delta loop (i.e. residual voltage loop), and by described zero sequence
Electric current sends to resonance judge module, and described resonance judge module i.e. can determine whether described electromagnetic type electricity according to the size of zero-sequence current
Whether pressure transformer there is ferromagnetic resonance, if it occur that ferromagnetic resonance, then can control the first control switch Guan Bi, make harmonic elimination electricity
Resistance forms series loop with open delta loop, harmonic elimination resistance increase the damping of electromagnetic potential transformer primary circuit, thus
Quickly eliminate the ferromagnetic resonance of electromagnetic potential transformer, owing to harmonic elimination resistance is connected directly between on open delta loop, it is possible to
Accurately, quickly eliminate ferromagnetic resonance, thus be effectively improved the harmonic elimination efficiency of ferromagnetic resonance, and, this simple in construction, effectively reduces
The cost of the complicated microcomputer secondary resonance elimination device that electrical network uses in prior art.
It addition, in the present invention implements, by controlling to be connected in parallel one second control on switch at harmonic elimination resistance and first
Switch, the quick harmonic elimination of ferromagnetic resonance that cannot quickly described electromagnetic potential transformer be produced upon described harmonic elimination resistance
Time, described second can be controlled by resonance judge module and control switch Guan Bi, make the open delta of electromagnetic potential transformer return
Road forms short circuit, is equivalent to the energized circuit short circuit of the electromagnetic potential transformer of resonant tank, thus to electromagnetic potential
The ferromagnetic resonance that transformer produces quickly eliminates, it is possible to improves the elimination efficiency of ferromagnetic resonance further, is greatly shortened existing skill
The time that in art, ferromagnetic resonance eliminates.
It should be appreciated that it is only exemplary and explanatory, not that above general description and details hereinafter describe
The present invention can be limited.
Accompanying drawing explanation
Accompanying drawing herein is merged in description and constitutes the part of this specification, it is shown that meet the enforcement of the present invention
Example, and for explaining the principle of the present invention together with description.
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, for those of ordinary skill in the art
Speech, on the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
The structural representation of a kind of ferromagnetic resonance harmonic elimination apparatus that Fig. 1 provides for the embodiment of the present invention；
The application scenarios schematic diagram of a kind of ferromagnetic resonance harmonic elimination apparatus that Fig. 2 provides for the embodiment of the present invention；
The schematic flow sheet of a kind of ferromagnetic resonance harmonic elimination method that Fig. 3 provides for the embodiment of the present invention；
The detailed process signal of step S102 of a kind of ferromagnetic resonance harmonic elimination method that Fig. 4 provides for the embodiment of the present invention
Figure；
The detailed process signal of step S103 of a kind of ferromagnetic resonance harmonic elimination method that Fig. 5 provides for the embodiment of the present invention
Figure；
The schematic flow sheet of the another kind of ferromagnetic resonance harmonic elimination method that Fig. 6 provides for the embodiment of the present invention；
The detailed process schematic diagram of the another kind of ferromagnetic resonance harmonic elimination method that Fig. 7 provides for the embodiment of the present invention.
Detailed description of the invention
Here will illustrate exemplary embodiment in detail, its example represents in the accompanying drawings.Explained below relates to
During accompanying drawing, unless otherwise indicated, the same numbers in different accompanying drawings represents same or analogous key element.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistent with the present invention.On the contrary, they are only with the most appended
The example of the apparatus and method that some aspects that described in detail in claims, the present invention are consistent.
Fig. 1 is the structural representation according to a kind of ferromagnetic resonance harmonic elimination apparatus shown in an exemplary embodiment.Such as 1 institute
Showing, this device can include power module 11, resonance judge module 12, harmonic elimination module summation current transformer 16 (CT, Current
Tranfer)。
In embodiment disclosed by the invention, power module 11 is respectively electrically connected to described resonance judge module 12 and harmonic elimination
Module, thus provide power supply for resonance judge module 12 and harmonic elimination module, described power module 11 can be that described resonance judges
Module 12 and harmonic elimination module provide the power supply of corresponding supply voltage, and power module 11 can be directly connected to civil power, described resonance
Judge module 12 can be CPU (Central Processing Unit, central processing unit) or PLC (Programmable
Logic Controller, programmable logic controller (PLC)), described resonance judge module 12 is electrically connected to described harmonic elimination module, uses
Harmonic elimination is carried out in controlling described harmonic elimination module；Described current transformer 16 is used for being electrically connected to described electromagnetic potential transformer 17
Connection wire between neutral point and ground, thus measured zero-sequence current (i.e. electromagnetic potential transformer three by current transformer 16
Phase exciting current sum).
In order to realize the ferromagnetic resonance to electromagnetic potential transformer in power distribution network 17, this harmonic elimination module at least includes that one disappears
Humorous resistance 13 and first controls switch 14, and the two ends of described harmonic elimination resistance 13 are connected to described electromagnetic potential transformer 17
The two ends in open delta loop, described first control switch 14 be series at described harmonic elimination resistance 13 and open delta loop it
Between, i.e. open delta loop, harmonic elimination resistance 13 and first controls switch 14 formation series loop, and by the first control switch 14
Break-make make open delta loop, harmonic elimination resistance 13 and first control switch 14 formation Guan Bi or the series loops disconnected.And
In embodiment disclosed by the invention, described resonance judge module 12 is electrically connected to the first control switch 14, thus is judged by resonance
Module 12 controls the described first break-make controlling switch 14.
Wherein, in embodiment disclosed by the invention, the Standard resistance range of described harmonic elimination resistance 13 is 0.5-10 Ω, preferably
It is 1 Ω, is accessed the two ends in the open delta loop of electromagnetic potential transformer 17 by harmonic elimination resistance 13, thus by harmonic elimination electricity
The resistance of resistance 13 increases electromagnetic potential transformer loop damping successively, thus eliminates the ferromagnetic of electromagnetic potential transformer generation
Resonance.And, described first controls switch 14 typically uses electronic power switch or relay switch, and power module 11 is respectively
Electrical connection the first control switch 14 and second controls switch 15, thus is controlled the first control switch 14 by resonance judge module 12
Make harmonic elimination resistance 13 directly and open delta circuit in series so that it is harmonic elimination quick to electromagnetic potential transformer.It is being embodied as
During, the resistance of harmonic elimination resistance 13 is the smaller the better, such as, when the resistance of harmonic elimination resistance 13 is 0.5 Ω, it is possible at utmost
Increase the primary circuit damping of electromagnetic potential transformer 17, make the ferromagnetic resonance of electromagnetic potential transformer 17 quickly eliminate.
In the ferromagnetic resonance harmonic elimination apparatus that the embodiment of the present invention provides, cannot quickly eliminate electricity when using harmonic elimination resistance 13
During the ferromagnetic resonance of electromagnetic type voltage transformer 17, the harmonic elimination module in the ferromagnetic resonance harmonic elimination apparatus that the embodiment of the present invention provides is also
Including the second control switch 15, described second controls switch 15 and described harmonic elimination resistance 13 and first controls to switch 14 and in parallel sets
Put, and second controls to switch 15 two ends being respectively electrically connected to described open delta loop, by controlling the second control switch 15
Break-make make open delta loop and second control open extension 15 formation series loops.Thus, when harmonic elimination resistance 13 cannot be to electromagnetism
The ferromagnetic resonance that formula voltage transformer produces is when quickly eliminating, and can put into this and second control switch 15, make open delta loop with
Second controls switch 15 series connection forms short circuit, and then eliminates the ferromagnetic resonance of electromagnetic potential transformer.
It addition, in embodiment disclosed by the invention, this device can also include timer (being not shown), described
Timer electrically connects with resonance judge module 12 and harmonic elimination module respectively, power module 11 provide running voltage for timer,
Accurately controlled the first control switch 14 and second by resonance judge module 12 according to the timing time of timer to control switch and 15 close
Close, thus reach the ferromagnetic resonance of electromagnetic potential transformer 17 is carried out the purpose of accurate harmonic elimination, be effectively improved harmonic elimination efficiency.
Meanwhile, in embodiment disclosed by the invention, the timing of different periods, and described timer can be carried out by a timer
Number can be arranged as required to multiple, by multiple timers to different periods Split Time, thus be effectively improved the time
Accurate control.
Fig. 2 shows ferromagnetic resonance harmonic elimination apparatus application scenarios schematic diagram in power distribution network that the embodiment of the present invention provides,
As in figure 2 it is shown, the ferromagnetic resonance harmonic elimination apparatus that the embodiment of the present invention provides includes power module 11, resonance judge module 12, disappears
Humorous resistance 13, first controls switch 14, second and controls switch 15 summation current transformers 16, and described power module 11 is electrically connected
To described resonance judge module 12 and harmonic elimination module, described current transformer 16 is also electrically connected to resonance judge module 12, electric current
Transformer 16 sends to resonance judge module 12 for the zero-sequence current that will gather.
Wherein, in power distribution network, three-phase voltage (E1, E2, E3) is respectively electrically connected to electromagnetic potential transformer 17, and electricity
Electromagnetic type voltage transformer 17 is connected in parallel a three phase capacitance (C1, C2, C3), and three phase capacitance is respectively electrically connected to three-phase voltage.
Described electromagnetic potential transformer 17 includes an open delta loop, and it is mutual that described current transformer 16 is electrically connected to electromagnetic potential
Connection wire between neutral point and the ground of sensor 17, thus for gathering the zero-sequence current of electromagnetic potential transformer 17；Institute
Stating harmonic elimination resistance 13 and first control switch 14 concatenation and be series at the two ends in open delta loop, described second controls switch
15 are arranged in parallel with harmonic elimination resistance 13 and the first control switch 14, and described second controls switch 15 concatenation to open delta loop
Two ends.
In specific implementation process, in the case of there is not EMR electromagnetic resonance in electromagnetic potential transformer 17, described first control
System switch 14 and the second control switch 15 are in when electromagnetic potential transformer 17 occurs EMR electromagnetic resonance, resonance judging mould
Block 12 controls the first control switch 14 Guan Bi, makes open delta loop and harmonic elimination resistance 13 form series loop, by harmonic elimination electricity
The primary circuit damping of resistance 13 increase electromagnetic potential transformer 17, thus eliminate ferromagnetic resonance；When the first control switch 14 closes
Conjunction Preset Time (such as 50ms) ferromagnetic resonance afterwards is still without eliminating, and resonance judge module 12 controls the second control switch 15 and closes
Close, control switch by first simultaneously and 14 open, make open delta loop control switch 15 formation series loops with second, due to the
After two control switch 15 and open delta circuit in series, second controls switch 15 just as a wire, i.e. open delta loop
Direct short-circuit, thus eliminate the ferromagnetic resonance of electromagnetic potential transformer 17.
Use the ferromagnetic resonance harmonic elimination apparatus that the embodiment of the present invention provides, be resonance judge module and disappearing by power module
Humorous module provides supply voltage, and by the zero-sequence current in current transformer detection electromagnetic potential transformer open delta loop,
And described zero-sequence current is sent to resonance judge module, described resonance judge module i.e. can determine whether according to the size of zero-sequence current
Whether described electromagnetic potential transformer there is ferromagnetic resonance, if it occur that ferromagnetic resonance, then can control the first control switch
Guan Bi, makes harmonic elimination resistance form series loop with open delta loop, harmonic elimination resistance increases electromagnetic potential transformer once
Loop damping, thus quickly eliminate the ferromagnetic resonance of electromagnetic potential transformer, owing to harmonic elimination resistance is connected directly between opening three
On angular convolution road, it is possible to quickly eliminate ferromagnetic resonance, thus be effectively improved the harmonic elimination efficiency of ferromagnetic resonance, and, this simple in construction,
Effectively reduce enterprise in prior art and use the cost of complex appts.
It addition, in the present invention implements, by controlling to be connected in parallel one second control on switch at harmonic elimination resistance and first
Switch, the quick harmonic elimination of ferromagnetic resonance that cannot quickly described electromagnetic potential transformer be produced upon described harmonic elimination resistance
Time, described second can be controlled by resonance judge module and control switch Guan Bi, make the open delta of electromagnetic potential transformer return
Road forms short circuit, thus the ferromagnetic resonance producing electromagnetic potential transformer quickly eliminates, it is possible to improve ferromagnetic humorous further
The elimination efficiency shaken, is greatly shortened the time that in prior art, ferromagnetic resonance eliminates.
The embodiment being above the device for present invention offer is described in detail, in embodiment disclosed by the invention
In, additionally provide the way of example that ferromagnetic resonance is carried out harmonic elimination method when harmonic elimination processes, referring specifically to real in detailed below
Execute the description of example.
Fig. 3 shows the schematic flow sheet of a kind of ferromagnetic resonance harmonic elimination method that the embodiment of the present invention provides.The present invention is public
The ferromagnetic resonance harmonic elimination method opened is applied in the resonance judge module 12 in ferromagnetic resonance harmonic elimination apparatus, judges mould by resonance
According to the zero-sequence current that current transformer 16 gathers, block 12 judges whether electromagnetic potential transformer 17 occurs ferromagnetic resonance, and lead to
Cross and control the first control switch 14, second and control the ferromagnetic resonance that electromagnetic potential transformer 17 produces by the break-make of switch 15 and enter
Row harmonic elimination processes.As it is shown on figure 3, the method may include steps of.
In step S101, it is judged that whether current transformer detects between electromagnetic potential transformer neutral point and ground
Zero-sequence current.Otherwise, terminate.
Owing to when electromagnetic potential transformer does not occur ferromagnetic resonance, the open delta of electromagnetic potential transformer returns
Road then will not produce faradic current, therefore can be by between current transformer detection electromagnetic potential transformer neutral point and ground
The size of zero-sequence current.
When detecting that zero-sequence current reaches to preset zero-sequence current, in step s 102, calculate in the first preset duration
Reach pulse number and the pulse width of the zero-sequence current of predetermined pulse amplitude.
In embodiment disclosed by the invention, generally, when electromagnetic potential transformer does not produces ferromagnetic resonance, still
Having zero-sequence current, the most now the pulse amplitude of zero-sequence current is relatively low, about 0-0.2mA.When detecting zero-sequence current, need
Will be by judging that whether zero-sequence current is beyond predetermined pulse amplitude zero-sequence current (the i.e. startup zero sequence electricity of ferromagnetic resonance harmonic elimination apparatus
Stream), the pulse amplitude of described default zero-sequence current is 10-100mA, and the pulse amplitude of default zero-sequence current is preferably
60mA.And described predetermined pulse amplitude is more than the pulse amplitude of described default zero-sequence current, zero-sequence current within a certain period of time
Pulse number and pulse width could judge to be whether electromagnetic potential transformer occurs ferromagnetic resonance.Wherein, when detecting
By timer can be started during zero-sequence current, in calculating the first preset duration, reach the arteries and veins of the zero-sequence current of predetermined pulse amplitude
Rush number and pulse width.In specific implementation process, described first preset duration could be arranged to 20ms, described predetermined pulse
Amplitude be ferromagnetic resonance harmonic elimination apparatus start amplitude, predetermined pulse amplitude can be set as 100-500mA, be preferable to provide into
200mA such that it is able to be easy to find ferromagnetic resonance in time and eliminate.In implementation process, described first preset duration and
Predetermined pulse amplitude is not limited to be above the numerical value that embodiment proposes, can be according to electromagnetic potential transformer and harmonic elimination
The resistance of resistance determines, no longer elaborates at this.
The detailed process schematic diagram of step S102 that the embodiment of the present invention provides can be found in Fig. 4.As shown in Figure 4, step
S102 specifically includes following steps:
When detecting that described zero-sequence current reaches to preset zero-sequence current, in step S1021, start the first timer,
Start timing.
In embodiment disclosed by the invention, need the pulse number by judging the zero-sequence current in certain time and arteries and veins
Rush width, and then judge whether electromagnetic current transducer occurs EMR electromagnetic resonance, and open when zero-sequence current is more than 10-100mA
Begin i.e. to add up pulse number and the pulse width of zero-sequence current, therefore, when zero-sequence current being detected, by starting the first timing
Device carries out the timing of the first preset duration, in implementation process, can carry out timing by the way of countdown.
In step S1022, gathered the zero-sequence current in the first preset duration of described timing by current transformer.
When timing starts, then by current transformer collection all of zero-sequence current in the first preset duration, and according to note
The pulse number of all of zero-sequence current of record, calculates the pulse width of each zero-sequence current, it is simple to the process of step S1023.
Wherein, described first preset duration is 20ms, and the time of the first preset duration might not be set to 20ms, it is also possible to according to
The cycle of the pulse current of the ferromagnetic resonance that electromagnetic potential transformer produces calculates, and can be the pulse electricity of ferromagnetic resonance
The multiple in the cycle of stream.
When collecting all of zero-sequence current in the first preset duration, in step S1023, search pulse amplitude and be more than
Or the zero-sequence current equal to predetermined pulse amplitude.
In embodiment disclosed by the invention, described predetermined pulse amplitude is value set in advance, in specific implementation process
In, described predetermined pulse amplitude is that the pulse amplitude of 100-500mA, the most only zero-sequence current is more than or equal to described predetermined pulse
Just can be regarded as in the case of amplitude is the zero-sequence current under ferromagnetic resonance to occur, therefore it may only be necessary to be more than in finding step S1022
Or the zero-sequence current equal to predetermined pulse amplitude.
When finding the zero-sequence current that pulse amplitude is more than or equal to predetermined pulse amplitude, in step S1024, calculate
Pulse amplitude is more than or equal to pulse number and the pulse width of the described zero-sequence current of predetermined pulse amplitude.
According to the zero-sequence current determined in step S1023, calculate zero-sequence current in step S1023 pulse number and
Corresponding pulse width.
In embodiment disclosed by the invention, the detailed process of step S102 is not limited to the step shown in above-described embodiment
The restriction of rapid sequencing, can first calculate pulse number and the pulse width of all zero-sequence currents, further according to zero sequence electricity
The pulse amplitude of stream filters out satisfactory zero sequence pulse current.
Use the mode of above-described embodiment, it is possible to reduce data processing amount to greatest extent, thus accelerate suitable zero sequence
The screening of electric current, thus reduce process and process the time, quickly judge whether electromagnetic potential transformer occurs EMR electromagnetic resonance, and
Carry out harmonic elimination by harmonic elimination resistance, thus improve harmonic elimination efficiency further.
Pulse number and the pulse width of the zero-sequence current of predetermined pulse amplitude is reached in getting the first preset duration
Time, in step s 103, it is judged that whether described electromagnetic potential transformer occurs ferromagnetic resonance.Otherwise, step is continued executing with
S101。
In embodiments of the present invention, by step S102 draws the pulse of the zero-sequence current reaching predetermined pulse amplitude
Number and pulse width carry out judging whether electromagnetic potential transformer occurs ferromagnetic resonance, wherein, concrete, when in step S102
When the pulse number of the zero-sequence current obtained and pulse width reach default pulse number and default pulse width, it is determined that
Electromagnetic potential transformer generation ferromagnetic resonance.
In embodiments of the present invention, the detailed process schematic diagram of step S103 can be found in Fig. 5.As it is shown in figure 5, this step
S103 may include steps of:
In step S1031, it is judged that the pulse number of described zero-sequence current whether more than 6, whether pulse width be more than
3ms.Otherwise, step S101 is performed.
The pulse of the zero-sequence current of predetermined pulse amplitude is reached in calculating the first preset duration in step s 102
When number and pulse width, need to determine whether electromagnetic potential transformer occurs according to pulse number and pulse width ferromagnetic humorous
Shake.When the pulse number of zero-sequence current and pulse width reach preset value in step S102, i.e. determine electromagnetic potential mutual inductance
Device generation ferromagnetic resonance.In specific implementation process, above-mentioned preset value is: the pulse number of zero-sequence current is 6, pulse width
For 3ms, therefore, by judge the pulse number of zero-sequence current whether more than 6, whether pulse width i.e. can determine that more than 3ms
Whether electromagnetic potential transformer there is ferromagnetic resonance.
When the pulse number of described zero-sequence current is more than 6 and pulse width is more than 3ms, determine described electromagnetic potential
Transformer generation ferromagnetic resonance.
When electromagnetic potential transformer generation ferromagnetic resonance, in step S104, control to be connected with harmonic elimination resistant series
First control switch Guan Bi, described electromagnetic potential transformer is carried out harmonic elimination process.
In embodiments of the present invention, when step S103 determines electromagnetic potential transformer generation ferromagnetic resonance, then control
First controls switch Guan Bi, makes the open delta loop of electromagnetic potential transformer, harmonic elimination resistance and first control switch and is formed
Series loop, thus the primary circuit damping of electromagnetic potential transformer is increased by harmonic elimination resistance, thus mutual to electromagnetic potential
The ferromagnetic resonance that sensor produces eliminates.
Use the method that the embodiment of the present invention provides, it is possible to exceed predetermined pulse amplitude (i.e. according in certain time 20ms
The current threshold that ferromagnetic resonance harmonic elimination apparatus starts) the pulse number of zero-sequence current and pulse width determine that electromagnetic potential is mutual
Whether sensor produces ferromagnetic resonance, and then controls the first control switch motion, makes harmonic elimination resistance increase electromagnetic potential transformer
Primary circuit damping, thus the ferromagnetic resonance producing electromagnetic potential transformer quickly eliminates, thus is effectively improved ferromagnetic
The harmonic elimination efficiency of resonance, it is to avoid cause equipment frequent breakage, causes serious threat to the safe and stable operation of electrical network and equipment.
Fig. 6 illustrates the schematic flow sheet of another ferromagnetic resonance harmonic elimination method that the embodiment of the present invention provides.Such as Fig. 6 institute
Showing, the method may include steps of.
In step S101, it is judged that whether current transformer detects between electromagnetic potential transformer neutral point and ground
Zero-sequence current.
When detecting that described zero-sequence current reaches to preset zero-sequence current, in step s 102, first is calculated when presetting
Pulse number and the pulse width of the zero-sequence current of predetermined pulse amplitude is reached in length.
When calculating pulse number and the pulse width of zero-sequence current, in step s 103, it is judged that described electromagnetic type electricity
Whether pressure transformer there is ferromagnetic resonance.
When described electromagnetic potential transformer generation ferromagnetic resonance, in step S104, control and harmonic elimination resistant series
The the first control switch Guan Bi connected, carries out harmonic elimination process to described electromagnetic potential transformer.
When controlling the first control switch Guan Bi being connected with harmonic elimination resistant series, in step S105, start the second meter
Time device, start timing.
In embodiment disclosed by the invention, the second timer and the first timer in step S1021 can be pre-set
Make a distinction, owing to controlling the first control switch Guan Bi, harmonic elimination resistance ferromagnetic resonance electromagnetic potential transformer produced
When carrying out harmonic elimination, it is not possible to make harmonic elimination resistance be in series connection with the open delta loop of electromagnetic potential transformer for a long time,
Otherwise will burn harmonic elimination resistance, accordingly, it would be desirable to by this second timer reclocking, when reaching default the second preset duration
Time, control to switch off by first, protect harmonic elimination resistance.Certainly, again can also be counted by the first timer in this step
Time.
Wherein, in implementation process, the second preset duration is the duration pre-set, i.e. by disappearing in the second preset duration
Humorous resistance carries out harmonic elimination, if by the success of harmonic elimination resistance harmonic elimination in the second preset duration, then having resonance judge module to disconnect immediately
First controls switch, makes electromagnetic potential transformer again come into operation.The timing mode of the second preset duration can be by falling
The mode timing of timing.
In step s 106, it is judged that in the second preset duration, the pulse amplitude of described zero-sequence current whether be reduced to institute
State below the pulse amplitude of default zero-sequence current.Otherwise, control first to switch off.
In embodiments of the present invention, when step S105 starts timing, then read the zero-sequence current that current transformer gathers,
And judge whether the pulse amplitude of described zero-sequence current arrives below predetermined pulse amplitude according to the pulse amplitude of zero-sequence current.As
Fruit in the second preset duration, the pulse amplitude of described zero-sequence current be reduced to preset zero-sequence current pulse amplitude below time,
Then terminating, control the first control simultaneously and switch off, the ferromagnetic resonance of electromagnetic potential transformer eliminates.If the duration of timing
When reaching the second Preset Time, the pulse amplitude of described zero-sequence current be not reduced to the pulse amplitude of described default zero-sequence current with
Under, then perform step S107.Wherein, in specific implementation process, described second preset duration is 50ms, i.e. harmonic elimination resistance puts into
In the case of 50ms is still harmonic elimination, then may burn harmonic elimination resistance, under the influence of harmonic elimination once process, need to control the second control
System switch Guan Bi realizes harmonic elimination further, but, described second preset duration is not limited to 50ms.
Time below the pulse amplitude that described zero-sequence current is not reduced to described default zero-sequence current, in step s 107,
Control described first to control to switch off, and control the electrically connected with the open delta loop of described electromagnetic potential transformer
Two control switch Guan Bi.
In embodiments of the present invention, when the duration of timing reaches the second preset duration, the pulse amplitude of zero-sequence current is still
It is not reduced to below the pulse amplitude 10-100mA of described default zero-sequence current, first controls the first control and switch off, i.e.
Series circuit between the open delta loop of harmonic elimination resistance and electromagnetic potential transformer disconnects, and controls the second control simultaneously and opens
Close Guan Bi, i.e. the open delta loop of electromagnetic potential transformer and form series loop, due to this loop with the second control switch
In second control switch without resistance and without other electric elements, therefore, described open delta loop is just as short circuit, thus eliminates
The ferromagnetic resonance of electromagnetic potential transformer.
In embodiment of the present invention implementation process, the ferromagnetic resonance produced when electromagnetic potential transformer is relatively big, control the
Two control switch Guan Bi certain time, in the case of still cannot eliminating ferromagnetic resonance, if unanimously keeping electromagnetic potential mutual inductance
The open delta loop short circuit of device, then may burn electromagnetic potential transformer.Therefore, the embodiment of the present invention is at above-mentioned Fig. 6
On the basis of, additionally provide another embodiment.Specifically can be found in shown in Fig. 7.
The detailed process schematic diagram of the ferromagnetic resonance harmonic elimination method provided as shown in Figure 7, step S107 of the method also may be used
To comprise the steps.
When controlling the second control switch Guan Bi electrically connected with the open delta loop of described electromagnetic potential transformer,
In step S1071, start the 3rd timer, start timing.
In embodiment disclosed by the invention, can pre-set the 3rd timer, described 3rd timer is different from
One timer and the second timer, thus when second controls switch Guan Bi, start timing by the 3rd timer.Concrete real
During executing, the 3rd timer can also be the second timer or the first timer, or, the first timer, the second timer
It is same timer with the 3rd timer, simply respectively timing, and independent timing in timing course each time.
In step S1072, whether the pulse amplitude of zero-sequence current described in real-time judge is reduced to described default zero sequence electricity
Below the pulse amplitude of stream.Otherwise, the second control switch is disconnected.
When three timer, then by receiving the zero-sequence current that current transformer gathers, it is judged that zero-sequence current
The size of pulse amplitude, and judge whether less than the pulse presetting zero-sequence current according to the size of the pulse amplitude of zero-sequence current
Amplitude, the pulse amplitude of described default zero-sequence current is 10-100mA.When the pulse amplitude of described zero-sequence current is reduced to preset
Time below the pulse amplitude of zero-sequence current, i.e. harmonic elimination success, the first control switch can be disconnected；Pulse when described zero-sequence current
When amplitude is not reduced to preset below the pulse amplitude of zero-sequence current, then perform step S1073.
In step S1073, when the pulse amplitude of described zero-sequence current is not reduced to the pulse of described default zero-sequence current
Below amplitude and when the 3rd duration of described timing reaches three preset duration, control described second and control to switch off.
When the pulse amplitude of zero-sequence current is not reduced to preset below the pulse amplitude of zero-sequence current, and timing time does not reaches
During to three preset duration, then continue to be carried out harmonic elimination by the short circuit in open delta loop；When the pulse amplitude of zero-sequence current does not drops
As little as preset below the pulse amplitude of zero-sequence current, and when timing time reaches three preset duration, then electromagnetic potential mutual inductance
The ferromagnetic resonance of device eliminates not yet, therefore, can control to switch off by second in advance, it is to avoid the opening of electromagnetic potential transformer
Electromagnetic potential transformer is burnt in the short circuit for a long time of triangle loop.Wherein, described 3rd preset duration is set to 200ms, thus
Electromagnetic potential transformer is avoided to burn.But, the 3rd preset duration is not limited to 200ms, can be mutual according to electromagnetic potential
The open delta loop of sensor is set, and is not described in detail in this.
When controlling the second control and switching off, in step S1074, control switch off-time when controlling described second
When reaching four preset duration, again control described second and control switch Guan Bi, until described zero-sequence current is down to described zero sequence
Below the pulse amplitude of electric current.
In embodiment disclosed by the invention, described 4th preset duration may be configured as 20-60ms, and preferential 4th pre-
If duration may be configured as 40ms.Can there is the 3rd timer reclocking, or, pre-set the 4th timer, by the 4th meter
Time device start timing, when timing duration reaches 20-60ms, again control described second control switch Guan Bi, make electromagnetic type electricity
The open delta loop short circuit of pressure transformer, eliminates the ferromagnetic resonance of electromagnetic potential transformer.And repeat above-mentioned
Step S1071 to step S1073, until the pulse amplitude of described zero-sequence current be reduced to the pulse amplitude presetting zero-sequence current with
Under.
Using the said method that the embodiment of the present invention provides, described harmonic elimination resistance cannot be quickly mutual to described electromagnetic potential
During the quick harmonic elimination of ferromagnetic resonance that sensor produces, described second can be controlled by resonance judge module and control switch Guan Bi, make electricity
The open delta loop of electromagnetic type voltage transformer forms short circuit, thus the ferromagnetic resonance producing electromagnetic potential transformer is quick
Eliminate, it is possible to improve the elimination efficiency of ferromagnetic resonance further, be greatly shortened the time that in prior art, ferromagnetic resonance eliminates.With
Time, it is to avoid equipment frequent breakage, causes serious threat to the safe and stable operation of electrical network and equipment.
Those skilled in the art are considering description and are putting into practice here after disclosure of the invention, will readily occur to its of the present invention
Its embodiment.The application is intended to any modification, purposes or the adaptations of the present invention, these modification, purposes or
Person's adaptations is followed the general principle of the present invention and includes the undocumented common knowledge in the art of the present invention
Or conventional techniques means.Description and embodiments is considered only as exemplary, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be appreciated that the invention is not limited in precision architecture described above and illustrated in the accompanying drawings, and
And various modifications and changes can carried out without departing from the scope.The scope of the present invention is only limited by appended claim.
Claims (10)
1. a ferromagnetic resonance harmonic elimination apparatus, for eliminating the ferromagnetic resonance for electromagnetic voltage transformer in power distribution network, its feature
It is, including: power module, resonance judge module, harmonic elimination module summation current transformer, wherein,
Described power module is electrically connected to described resonance judge module and harmonic elimination module；
Described current transformer is electrically connected to the connection wire between described electromagnetic potential transformer neutral point and ground, described electricity
Current transformer electrically connects with described resonance judge module；
Described harmonic elimination module includes that harmonic elimination resistance and first controls switch, and the two ends of described harmonic elimination resistance are connected to described electricity
The two ends in the open delta loop of electromagnetic type voltage transformer, described first control switch series is coupled to described harmonic elimination resistance and opens with described
Between mouth triangle loop；Described resonance judge module is electrically connected to described first and controls switch.
Device the most according to claim 1, it is characterised in that described harmonic elimination module also includes that the second control switchs, wherein,
Described second controls switch is connected with described harmonic elimination resistance and the first control switch in parallel, and described second controls switch respectively
It is electrically connected to the two ends in described open delta loop.
Device the most according to claim 1, it is characterised in that described device also includes timer, described timer is respectively
Electrically connect with described resonance judge module and harmonic elimination module.
Device the most according to claim 2, it is characterised in that the Standard resistance range of described harmonic elimination resistance is 0.5-10 Ω.
Device the most according to claim 4, it is characterised in that the resistance size of described harmonic elimination resistance is 1 Ω.
6. a ferromagnetic resonance harmonic elimination method, it is characterised in that including:
Judge whether current transformer detects the zero-sequence current between electromagnetic potential transformer neutral point and ground；
When detecting that described zero-sequence current reaches to preset zero-sequence current, in calculating the first preset duration, reach predetermined pulse width
The pulse number of the zero-sequence current of value and pulse width, wherein, described predetermined pulse amplitude is more than described default zero-sequence current
Pulse amplitude；
According to described pulse number and pulse width, it is judged that whether described electromagnetic potential transformer occurs ferromagnetic resonance；
When described electromagnetic potential transformer generation ferromagnetic resonance, control the first control switch being connected with harmonic elimination resistant series
Guan Bi, carries out harmonic elimination process to described electromagnetic potential transformer.
Method the most according to claim 6, it is characterised in that described in calculate the first preset duration in reach predetermined pulse
The pulse number of the zero-sequence current of amplitude and pulse width, including:
When detecting that described zero-sequence current reaches to preset zero-sequence current, start the first timer, start timing；
The zero-sequence current in the first preset duration of described timing is gathered by current transformer；
Search the pulse amplitude zero-sequence current more than or equal to predetermined pulse amplitude；
Calculating pulse amplitude is more than or equal to pulse number and the pulse width of the described zero-sequence current of predetermined pulse amplitude.
Method the most according to claim 6, it is characterised in that judge whether described electromagnetic potential transformer occurs ferromagnetic
Resonance, including:
Judge the pulse number of described zero-sequence current whether more than 6, whether pulse width more than 3ms；
When the pulse number of described zero-sequence current is more than 6 and pulse width is more than 3ms, determine described electromagnetic potential mutual inductance
Device generation ferromagnetic resonance.
Method the most according to claim 8, it is characterised in that when the first control controlling to be connected with harmonic elimination resistant series is opened
When closing Guan Bi, described method also includes:
Start the second timer, start timing；
Judge in the second preset duration, whether the pulse amplitude of described zero-sequence current is reduced to the arteries and veins of described default zero-sequence current
Rush below amplitude；
Time below the pulse amplitude that described zero-sequence current is not reduced to described default zero-sequence current, control described first and control to open
Close and disconnect, and control the second control switch Guan Bi electrically connected with the open delta loop of described electromagnetic potential transformer, with
Make the open delta loop short circuit of described electromagnetic potential transformer, eliminate the ferromagnetic resonance of described electromagnetic potential transformer.
Method the most according to claim 9, it is characterised in that when controlling the opening with described electromagnetic potential transformer
When second control switch of triangle loop electrical connection closes, described method also includes:
Start the 3rd timer, start timing；
Whether the pulse amplitude of zero-sequence current described in real-time judge is reduced to below the pulse amplitude of described default zero-sequence current；
Below the pulse amplitude that the pulse amplitude of described zero-sequence current is not reduced to described default zero-sequence current and described timing
The 3rd duration when reaching three preset duration, control described second and control to switch off；
When controlling described second control switch off-time and reaching four preset duration, again control described second and control switch
Guan Bi, until the pulse amplitude of described zero-sequence current is down to below the pulse amplitude of described default zero-sequence current.
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| CN106992506A (en) * | 2017-06-02 | 2017-07-28 | 云南电网有限责任公司电力科学研究院 | A kind of fuse protection device and method applied to electromagnetic potential transformer |
| CN107957539A (en) * | 2018-01-15 | 2018-04-24 | 云南电网有限责任公司电力科学研究院 | A kind of electromagnetic potential transformer first winding tail end insulation detecting method and device |
| CN108631281A (en) * | 2018-05-18 | 2018-10-09 | 云南电网有限责任公司电力科学研究院 | A kind of harmonic elimination method of ferromagnetic resonance |
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| CN106992506B (en) * | 2017-06-02 | 2018-09-11 | 云南电网有限责任公司电力科学研究院 | A kind of fuse protective device and method applied to electromagnetic potential transformer |
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| CN108988308A (en) * | 2018-08-24 | 2018-12-11 | 国网河北省电力有限公司电力科学研究院 | The inhibition device and method of resonance overvoltage |
| CN110021920B (en) * | 2019-03-14 | 2020-11-20 | 国网新疆电力有限公司昌吉供电公司 | Active harmonic elimination resistor device and resistor setting method |
| CN110021920A (en) * | 2019-03-14 | 2019-07-16 | 国网新疆电力有限公司昌吉供电公司 | Active harmonic elimination resistance device and resistance setting method |
| CN110007261A (en) * | 2019-03-14 | 2019-07-12 | 国网新疆电力有限公司昌吉供电公司 | Voltage transformer primary side High-voltage Fuse Blow judgment means and its judgment method |
| CN110007261B (en) * | 2019-03-14 | 2024-03-19 | 国网新疆电力有限公司昌吉供电公司 | Device and method for judging fusing of primary side high-voltage fuse of voltage transformer |
| CN110165669A (en) * | 2019-04-30 | 2019-08-23 | 云南电网有限责任公司电力科学研究院 | A kind of power distribution network active compensator and its suppressing method |
| CN110829373A (en) * | 2019-11-14 | 2020-02-21 | 国网山东省电力公司潍坊市寒亭区供电公司 | Anti-excitation current electromagnetic voltage transformer |
| CN110988597A (en) * | 2019-12-15 | 2020-04-10 | 云南电网有限责任公司文山供电局 | Resonance type detection method based on neural network |
| CN112039038A (en) * | 2020-08-24 | 2020-12-04 | 国网河北省电力有限公司邯郸供电分公司 | Voltage transformer resonance active elimination method based on energy release |
| CN113097986A (en) * | 2021-03-31 | 2021-07-09 | 国网内蒙古东部电力有限公司电力科学研究院 | Protection method, device and system for primary harmonic elimination device of distribution network voltage transformer |
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