CN106229945B - A kind of excitation surge current elimination system and method - Google Patents
A kind of excitation surge current elimination system and method Download PDFInfo
- Publication number
- CN106229945B CN106229945B CN201610884961.2A CN201610884961A CN106229945B CN 106229945 B CN106229945 B CN 106229945B CN 201610884961 A CN201610884961 A CN 201610884961A CN 106229945 B CN106229945 B CN 106229945B
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- China
- Prior art keywords
- control switch
- transformer
- generating set
- surge current
- bus
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Classifications
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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
-
- 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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Eletrric Generators (AREA)
- Protection Of Transformers (AREA)
Abstract
The invention discloses a kind of excitation surge currents to eliminate system and method, including the regulator or generating set with transformers connected in parallel to be impacted on bus, the junction of the regulator or generating set and bus is provided with the first control switch, the junction of the transformer to be impacted and bus is provided with the second control switch, and the system outlet of bus or the secondary end of transformer to be impacted are provided with third control switch；By the switch state and switching sequence of the first control switch of control, the second control switch and third control switch, make the voltage of transformer to be impacted from stepping up from zero to voltage rating, realizes the slow promotion of stable state magnetic flux to eliminate excitation surge current.The problem of influence of the excitation surge current to system when the present invention completely eliminates transformer impact, the scope of application is very wide, leads to systemic breakdown because of excitation surge current when isolated network impact high-power transformer can be solved perfectly.
Description
Technical field
The present invention relates to a kind of excitation surge currents to eliminate system and method.
Background technique
It can be obtained in transformer impact process by following formula due to transient state magnetic flux (Φr+Φmcosα)e-Rt/LPresence,
Cause its impact moment may magnetic saturation, to generate very high excitation surge current.Wherein α is that transformer impacts moment
Initial phase angle, R are coil-block of transformer, and L is transformer winding inductance, ΦrRemanent magnetism in iron core when being impacted for transformer.
According to
It can obtain: Φ=- Φmcos(ωt+α)+(Φr+Φmcosα)e-Rt/L (2)
Now for excitation surge current conventional treatment method there are two types of:
(1) pass through Recognition feedback to the excitation surge current of secondary circuit and the feature differentiation primary system of fault current analog quantity
Prevent excitation surge current from leading to false protection in the moment latch-up protection that excitation surge current generates with the presence or absence of failure.Such scheme one
Excitation surge current in minor loop still has, and cannot be guaranteed 100% not malfunction of device；
(2) the voltage phase angle α of last time separating brake is recorded, the voltage phase angle α ' when closing a floodgate again by controlling makes to remain in transformer
Magnetic is opposite with bias polarity to offset each other to realize the purpose for inhibiting excitation surge current.Although such scheme can inhibit even to disappear
Except excitation surge current, but the premise realized is the voltage phase angle α that must record separating brake moment last time, and it is first not to be suitable for transformer
The uncontrollable situation of the remanent magnetism such as transformer special test was done after putting into operation or stopping transport.
Summary of the invention
The present invention to solve the above-mentioned problems, proposes a kind of excitation surge current elimination system and method, and the present invention disappears completely
Influence of the excitation surge current to system when except transformer impact, the scope of application is very wide, and isolated network impact large capacity can be solved perfectly
The problem of leading to systemic breakdown because of excitation surge current when transformer.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of excitation surge current eliminates system, including with transformers connected in parallel to be impacted or the regulator being connected on bus or
The junction of generating set, the regulator or generating set and bus is provided with the first control switch, described to become wait impact
The junction of depressor and bus is provided with the second control switch, the system outlet of bus or the secondary end setting of transformer to be impacted
There is third control switch；
By controlling the switch state and switching sequence of the first control switch, the second control switch and third control switch,
Make the voltage of transformer to be impacted from stepping up from zero to voltage rating, realizes that the slow promotion of stable state magnetic flux is gushed to eliminate excitation
Stream.
It is described wait impact transformer voltage rise to it is specified after, synchronization device is incorporated to bus-bar system, voltage adjusting device or power generation
Unit off-grid.
It is described wait impact transformer voltage rise to it is specified after, the synchronization device of third control switch is closed a floodgate, and its combined floodgate is led
The preceding time obtains according to false side-by-side experiment, and false side-by-side experiment confirms that asynchronous switch-on point is qualified simultaneously.
When selecting generating set, releases the gate out switch of generating set and mesh belt initial load logic and gate out switch join
Jump steam turbine logic.
The excitation surge current eliminates the secondary circuit of system, by the closing position auxiliary contact elder generation three-phase of third control switch
Series connection in the manual brake separating circuit of first control switch of access in parallel, realizes the first control described in third control switch combined floodgate shunt tripping again
System switch is connected into the time to reduce voltage adjusting device or the arranged side by side of generating set.
It, must when being boosted by generating set and not using the first control switch logic described in third control switch combined floodgate shunt tripping
The third control switch closing position must be connected to generating set and mesh belt initial load interdependent node, prevent generator against function
Rate.
First control switch, the second control switch and third control switch are breaker.
The regulator or generating set and transformer to be impacted are mutually independent system, non-dedicated to become in wait impact
Depressor power transmission.
A kind of excitation surge current removing method needs the transformer that impacts and phase using voltage adjusting device or by generating set band
It closes bus and slowly boosts to specified, specifically include:
1) confirm the pass the tests such as equipment pressure resistance, and system wiring is errorless to maintain to operate normally；
2) the first control switch, the second control switch are confirmed in "on" position, and third control switch is in gate-dividing state；
3) start voltage adjusting device or generating set, make bus and transformer stepping up from zero to be impacted to system nominal voltage；
4) confirmation transformer station high-voltage side bus normally starts synchronization device, third control switch asynchronous switch-on afterwards；
5) the first control switch of confirmation has disconnected, and transformer station high-voltage side bus is normal, and system restores normal operating mode.
The invention has the benefit that influence of the excitation surge current to system when completely eliminating transformer impact, it can be perfect
It solves the problems, such as when isolated network impacts high-power transformer because excitation surge current leads to systemic breakdown.Change suitable for all voltage class
Depressor；By booster apparatus or generating set and transformer series or in parallel, transformer voltage zero, which opens, to boost to specified, and process is flat
Surely, booster apparatus or generating set and it is non-expert with impact transformer, be connected on power grid any one power generation can be used
Unit or voltage adjusting device replace, practical.
Detailed description of the invention
Fig. 1 is primary system wiring schematic diagram；
Fig. 2 is another primary equipment wiring schematic diagram；
Fig. 3 is Fig. 1, K3 breaker closing shunt tripping K1 breaker secondary connection schematic diagram in 2；
In figure: K1, K2, K3 are breaker, and system busbar, voltage adjusting device or generating set, system outlet are normal
Running equipment.
Specific embodiment:
The invention will be further described with embodiment with reference to the accompanying drawing.
The technical solution adopted by the present invention is that: one kind passing through the stable state magnetic flux-Φ in control formula (2)mcos(ωt+α)
It is slowly promoted and avoids generating excitation surge current because of transformer magnetic saturation, comprising: needed using voltage adjusting device or by generating set band
The transformer and associated bus of impact slowly boost to specified.
Further, transformer voltage rise to it is specified after the same period be incorporated to system, voltage adjusting device or generating set off-grid.
Shunt tripping voltage adjusting device or generating set gate out switch make its off-grid after grid-connected switch and combined floodgate.
As shown in Figure 1 and Figure 2, a kind of primary system wiring schematic diagram for making transformer slowly boost, including pressure regulation is used to set
The standby or transformer that needs to impact by generating set band and the slow pressure regulation of associated bus are to specified.Scheme implementation steps are as follows:
1) confirm the pass the tests such as equipment pressure resistance, and system wiring is errorless to operate normally；
2) confirmation K1, K2 is in "on" position, and K3 is in gate-dividing state；
3) start voltage adjusting device or generating set, band system busbar and transformer stepping up from zero to be impacted are electric to system nominal
Pressure；
4) confirmation transformer station high-voltage side bus normally starts synchronization device, K3 asynchronous switch-on afterwards；
5) confirmation K1 has been disconnected, and transformer station high-voltage side bus is normal；
6) normal charging operation, system restore normal operating mode to transformer.
Remarks: if using this scheme for the first time, it is necessary to confirm asynchronous switch-on leading time, it is false to carry out K3 breaker synchronization device
Side-by-side experiment confirms that asynchronous switch-on point is qualified.If using generating set, it is necessary to release its gate out switch and mesh belt initial load logic
And gate out switch shunt tripping steam turbine logic.
As shown in figure 3, a kind of second loop return wiring of the later shunt tripping K1 breaker of K3 breaker closing made in Fig. 1, Fig. 2
Figure, including will be accessed after K3 breaker closing location assistance contact three-phase series (or two group node elder generation three-phase series are in parallel connection)
In K1 breaker manual brake separating (or protection separating brake) circuit, realizes K3 breaker closing shunt tripping K1 breaker, reduce voltage adjusting device
Or the time arranged side by side (being detailed in Fig. 3) of generating set and system.
If not using Fig. 3 correlation secondary circuit and being boosted using generating set, K3 breaker closing position can be connected to
Simultaneously mesh belt initial load interdependent node prevents reverse-power in the generator to generating set.
It, can to realize K3 breaker three-phase closing position auxiliary node used by K3 breaker closing shunt tripping K1 breaker
It, can also be in parallel with trip protection instruction in parallel with simultaneously K1 breaker manual brake separating instruction as shown in the figure.
Above-mentioned, although the foregoing specific embodiments of the present invention is described with reference to the accompanying drawings, not protects model to the present invention
The limitation enclosed, those skilled in the art should understand that, based on the technical solutions of the present invention, those skilled in the art are not
Need to make the creative labor the various modifications or changes that can be made still within protection scope of the present invention.
Claims (7)
1. a kind of excitation surge current eliminates system, it is characterized in that: including and transformers connected in parallel to be impacted or the tune being connected on bus
The junction of pressure device or generating set, the regulator or generating set and bus is provided with the first control switch, described
The junction of transformer and bus to be impacted is provided with the second control switch, the system outlet of bus or time of transformer to be impacted
Grade end is provided with third control switch；
By control the first control switch, the second control switch and third control switch switch state and switching sequence, make to
The voltage of transformer is impacted from stepping up from zero to voltage rating, realizes the slow promotion of stable state magnetic flux to eliminate excitation surge current；
When selecting generating set, the gate out switch and mesh belt initial load logic and gate out switch shunt tripping vapour of generating set are released
Turbine logic；
The regulator or generating set are any one regulator or generating set being connected on power grid.
2. a kind of excitation surge current as described in claim 1 eliminates system, it is characterized in that: the transformer voltage to be impacted rises to
After specified, synchronization device is incorporated to bus-bar system, voltage adjusting device or generating set off-grid.
3. a kind of excitation surge current as described in claim 1 eliminates system, it is characterized in that: the transformer voltage to be impacted rises to
After specified, the synchronization device of third control switch is closed a floodgate, and its combined floodgate leading time is obtained according to false side-by-side experiment, false examination side by side
It tests while confirming that asynchronous switch-on point is qualified.
4. a kind of excitation surge current as described in claim 1 eliminates system, it is characterized in that: the excitation surge current eliminates the two of system
Minor loop accesses the manual of the first control switch in parallel again after the closing position auxiliary contact three-phase series of third control switch
In sub-gate circuit, the first control switch described in third control switch combined floodgate shunt tripping is realized, to reduce voltage adjusting device or generating set
Be connected into the time side by side.
5. a kind of excitation surge current as claimed in claim 4 eliminates system, it is characterized in that: when being boosted and not adopted by generating set
The logic of the first control switch described in above-mentioned third control switch combined floodgate shunt tripping, it is necessary to by third control switch closing position
It sets and is connected to generating set and mesh belt initial load interdependent node, prevent reverse-power in the generator.
6. a kind of excitation surge current as described in claim 1 eliminates system, it is characterized in that: first control switch, the second control
System switch and third control switch are breaker.
7. a kind of excitation surge current removing method using such as excitation surge current of any of claims 1-6 elimination system,
It is characterized in that: needing the transformer that impacts and the slow pressure regulation of associated bus to volume using voltage adjusting device or by generating set band
It is fixed, it specifically includes:
1) confirm the pass the tests such as equipment pressure resistance, and system wiring is errorless to maintain to operate normally；
2) the first control switch, the second control switch are confirmed in "on" position, and third control switch is in gate-dividing state；
3) start voltage adjusting device or generating set, make bus and transformer stepping up from zero to be impacted to system nominal voltage；
4) confirmation transformer station high-voltage side bus normally starts synchronization device, third control switch asynchronous switch-on afterwards；
5) the first control switch of confirmation has disconnected, and transformer station high-voltage side bus is normal, and system restores normal operating mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610884961.2A CN106229945B (en) | 2016-10-10 | 2016-10-10 | A kind of excitation surge current elimination system and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610884961.2A CN106229945B (en) | 2016-10-10 | 2016-10-10 | A kind of excitation surge current elimination system and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106229945A CN106229945A (en) | 2016-12-14 |
| CN106229945B true CN106229945B (en) | 2019-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610884961.2A Expired - Fee Related CN106229945B (en) | 2016-10-10 | 2016-10-10 | A kind of excitation surge current elimination system and method |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111884204B (en) * | 2020-06-12 | 2021-12-10 | 武汉天富海科技发展有限公司 | Phase selection switching control method of non-contact regulation voltage stabilizing device |
| CN114362115B (en) * | 2021-12-31 | 2024-04-05 | 贵州电网有限责任公司 | Main transformer excitation-free inrush current operation method based on flexible power electronic switch |
| CN114583673A (en) * | 2022-03-03 | 2022-06-03 | 贵州电网有限责任公司 | Main transformer excitation-free inrush current commissioning method for zero start boosting of flexible power electronic switch |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075498A (en) * | 2007-04-13 | 2007-11-21 | 中国南车集团株洲电力机车研究所 | Method and device for inhibiting transformer no-load switchon surge |
| CN101557096A (en) * | 2009-01-21 | 2009-10-14 | 湖南大学 | Voltage transformer excitation surge current free idle-loaded switching-on controller |
| CN102790405A (en) * | 2012-07-30 | 2012-11-21 | 能科节能技术股份有限公司 | Device and method for controlling magnetizing inrush current through wave chopping and voltage regulating |
| CN202749184U (en) * | 2012-06-26 | 2013-02-20 | 华锐风电科技(集团)股份有限公司 | Pre-magnetizing device for transformer of high-power wind power complete machine test bench |
| CN105870929A (en) * | 2016-03-28 | 2016-08-17 | 清华大学 | Device and method for suppressing excitation surge current of ship transformer |
-
2016
- 2016-10-10 CN CN201610884961.2A patent/CN106229945B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101075498A (en) * | 2007-04-13 | 2007-11-21 | 中国南车集团株洲电力机车研究所 | Method and device for inhibiting transformer no-load switchon surge |
| CN101557096A (en) * | 2009-01-21 | 2009-10-14 | 湖南大学 | Voltage transformer excitation surge current free idle-loaded switching-on controller |
| CN202749184U (en) * | 2012-06-26 | 2013-02-20 | 华锐风电科技(集团)股份有限公司 | Pre-magnetizing device for transformer of high-power wind power complete machine test bench |
| CN102790405A (en) * | 2012-07-30 | 2012-11-21 | 能科节能技术股份有限公司 | Device and method for controlling magnetizing inrush current through wave chopping and voltage regulating |
| CN105870929A (en) * | 2016-03-28 | 2016-08-17 | 清华大学 | Device and method for suppressing excitation surge current of ship transformer |
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| CN106229945A (en) | 2016-12-14 |
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Granted publication date: 20190409 Termination date: 20211010 |