CN107015114A - The broken string recognition methods compared based on non-faulting phase current correlation - Google Patents
The broken string recognition methods compared based on non-faulting phase current correlation Download PDFInfo
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- CN107015114A CN107015114A CN201710232550.XA CN201710232550A CN107015114A CN 107015114 A CN107015114 A CN 107015114A CN 201710232550 A CN201710232550 A CN 201710232550A CN 107015114 A CN107015114 A CN 107015114A
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- phase
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/088—Aspects of digital computing
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- Engineering & Computer Science (AREA)
- Mathematical Physics (AREA)
- Theoretical Computer Science (AREA)
- Locating Faults (AREA)
Abstract
The invention discloses a kind of broken string recognition methods compared based on non-faulting phase current correlation, by gathering the three-phase voltage of bus and the three-phase current of every outlet in transformer station, and the Sudden Changing Rate and the amplitude of each outlet three-phase current that three-phase voltage amplitude calculated based on this, the phase for selecting voltage rise mutually to occur for broken string, voltage reduction is mutually to perfect phase, and then the size of all outlet coefficient correlation absolute values is obtained, maximum of which is exactly faulty line；The present invention only uses substation information, is not influenceed by neutral grounding in distribution power network and broken position, and can be broken phase to phase fault and broken string application of load side joint earth fault with reliable recognition, effectively improve the reliability that power distribution network is powered.
Description
Technical field
The present invention relates to a kind of power distribution network relay protecting method, specially power distribution network is mutually electric based on non-faulting after breaking
The recognition methods that stream correlation compares.
Background technology
Power distribution network is the supply network that region be directly facing user, is the important component of power system, the development speed of distribution
Degree is closely bound up with the life of the level of economic development and people, inseparable.The current most of city of China uses 10kV
Voltage class is to customer power supply.The probability highest of single-phase wire break and earth fault occurs in power distribution network, disconnection fault can be because of circuit
Land and form earth fault.Current China power distribution network is mainly small current neutral grounding mode, when single-phase earthing event occurs for power distribution network
During barrier, in order to improve power supply reliability, it is desirable to power network continuous service 1-2h.In the meantime when personnel pass through accident point, easily
Human casualty accident is caused, the life security and safe operation of electric network of the serious threat people.
With the growth of national economy, people increasingly pay attention to the construction of power distribution network.In order to reduce human casualty accident, have
The quick identification of necessity research distribution single-phase fault and treatment technology.Due to power distribution network broad covered area, in order to exploitativeness,
Study extremely urgent with treatment technology based on the single-phase fault identification under existing distribution net equipment configuration condition.Patented technology of the present invention
New method is recognized merely with the broken string of substation information.
The content of the invention
Patent of the present invention mainly solves earth-free and broken string load side earth fault identification of breaking.When generation is broken not
Fault signature after earth fault and broken string load side earth fault is to have one mutually to raise in bus three-phase voltage, two-phase in addition
Reduction, the voltage rise phase current of faulty line is changed into 0, for faulty line, perfects the current phase of phase on the contrary, for sound
Circuit, three-phase voltage almost symmetry.Based on this construction broken string identical criterion.
To realize above-mentioned target, the present invention is adopted the following technical scheme that：
Step one：The three-phase voltage of bus and the three-phase current of every outlet are gathered in transformer station.
Step 2：The power frequency amplitude of bus three-phase voltage is extracted by fft algorithm.
Step 3：The Sudden Changing Rate of bus three-phase voltage amplitude is calculated by formula (1).
WhereinThe Sudden Changing Rate of phase voltage amplitude is represented,For the amplitude of phase voltage after failure,Represent phase before failure
The amplitude of voltage.
The Sudden Changing Rate of phase voltage amplitude is more than 0, represents phase voltage rise, and the Sudden Changing Rate of phase voltage amplitude is less than 0, represents drop
It is low.Mutually raised if it is judged that bus three-phase electricity is pressed with one, two-phase is reduced in addition, then step 4 is carried out, if not this feelings
Condition, then return to step one and recalculate.
Step 4：The amplitude of each outlet three-phase current is proposed by fft algorithm, if voltage is raised in any certain outlet
The electric current of phase is 0, then carries out step 5, if the voltage rise phase current of all outlets is not 0, is opened again from step one
Begin to calculate.
Step 5：Voltage is selected to raise the phase mutually occurred for broken string, voltage reduction is mutually to perfect phase.
Step 6：The coefficient correlation that all outlets perfect biphase current is calculated by formula (2).
ρxyCoefficient correlation is represented, N is the sampling number in a cycle, and x (n) and y (n) represent that two perfect phase respectively.
When two frequency identical sinusoidal quantity phases differ 120 °, coefficient correlation is -0.5, when two frequency identicals just
When string amount phase differs 180 °, coefficient correlation is -1.
Step 7：Seek the absolute value of all outlet coefficient correlations.
Step 8：Compare the size of all outlet coefficient correlation absolute values, maximum of which is exactly faulty line
The beneficial effects of the invention are as follows：The broken string recognition methods of the invention compared based on non-faulting phase current correlation is not
Influenceed, with reliable recognition broken string phase to phase fault and broken string plus can be born by neutral grounding in distribution power network and broken position
Lotus side joint earth fault.
Brief description of the drawings
Fig. 1 is 10kV power distribution network simulation models；
The phase relation absolute value of 4 outlet non-faulting phase currents when Fig. 2 is breaks earth-free；
The phase relation absolute value of 4 outlet non-faulting phase currents when Fig. 3 is broken string load side ground connection.
Embodiment
Fig. 1 is the 10kV power distribution network simulation model schematic diagrames set up based on PSCAD；In the model, 35kV transformer stations have two
Back into line, the 10kV systems allotted by two main transformers are single busbar form；Bus carries each in 4 main feeders, outlet
The numbering of section is as shown in FIG..Wherein, section 1,3,5,10 is cable, and section 2,9,11,12,13 is aerial insulated wire, area
Section 4,6,7,8,14 is overhead bare conductor.Arc suppression coil becomes on neutral point mounted in used.When switching K openings, system is neutral point
Isolated neutral system；It is then arc suppression coil earthing system to switch K closures, and overcompensation degree is taken as 10%.
Each section length is respectively：L1=5.1km, L2=4km, L3=3.8km, L4=7.5km, L5=4km, L6=
10km, L7=0.1km, L8=3km, L9=4km, L10=3.2km, L11=10km, L12=5km, L13=3km, L14=7.5km.
Cable data is：Positive sequence resistance r1=0.157 Ω/km, positive sequence induction reactance x1=0.076 Ω/km, positive sequence accommodates b1=
132×10-6S/km；Zero sequence resistance r0=0.307 Ω/km, zero sequence induction reactance x0=0.304 Ω/km, zero sequence accommodates b0=110 ×
10-6S/km。
Aerial insulated wire parameter is：Positive sequence resistance r1=0.27 Ω/km, positive sequence induction reactance x1=0.352 Ω/km, positive sequence is accommodated
b1=3.178 × 10-6S/km；Zero sequence resistance r0=0.42 Ω/km, zero sequence induction reactance x0=3.618 Ω/km, zero sequence accommodates b0=
0.676×10-6S/km。
Bare conductor parameter is in section 7,8：Positive sequence resistance r1=0.91 Ω/km, positive sequence induction reactance x1=0.403 Ω/km, just
Sequence accommodates b1=2.729 × 10-6S/km；Zero sequence resistance r0=1.06 Ω/km, zero sequence induction reactance x0=3.618 Ω/km, zero sequence is accommodated
b0=0.672 × 10-6S/km。
Other section bare conductor parameters are：Positive sequence resistance r1=0.63 Ω/km, positive sequence induction reactance x1=0.392 Ω/km, positive sequence
Accommodate b1=2.807 × 10-6S/km；Zero sequence resistance r0=0.78 Ω/km, zero sequence induction reactance x0=3.593 Ω/km, zero sequence accommodates b0
=0.683 × 10-6S/km。
Two main transformer parameters are respectively：Capacity SN=2MVA, short circuit loss Pk=20.586kW, short-circuit voltage percentage
Uk%=6.37%, open circuit loss P0=2.88kW, no-load current percentage I0%=0.61%；Capacity SN=2MVA, short circuit is damaged
Consume Pk=20.591kW, short-circuit voltage percentage Uk%=6.35%, open circuit loss P0=2.83kW, no-load current percentage
I0%=0.62%.
Make each distribution transformer and institute's jointing numbering unanimously, then their capacity is respectively：S5N=50kVA, S7N=
500kVA, S8N=200kVA, S9N=1MVA, S10N=100kVA, S12N=1MVA, S13N=400kVA, S14N=630kVA.For
For the sake of simplicity, it is the 80% of transformer capacity that each distribution transformer institute on-load is unified, power factor is 0.85.
Fig. 2 is the waveform for setting the emulation of single-phase wire break phase to phase fault to obtain in the end of isolated neutral system section 1.Can be with
Find out, the coefficient correlation maximum absolute value of circuit 1, it is possible to it is determined that being that circuit 1 there occurs disconnection fault.
Fig. 3 is that arc suppression coil earthing system sets single-phase wire break application of load side joint earth fault to emulate in the head end of section 4
The waveform arrived.As can be seen that the coefficient correlation maximum absolute value of circuit 4, it is possible to which true timing circuit 4 there occurs broken string event
Barrier.
To sum up analysis is not it can be seen that the broken string recognition methods compared based on non-faulting phase current correlation is by power distribution network
Property point earthing mode and broken position influence, can with reliable recognition break phase to phase fault and broken string application of load side joint it is former
Barrier.
Claims (4)
- The recognition methods 1. a kind of power distribution network breaks, it is characterised in that the correlation based on non-faulting phase current is relatively identified, Substation information is only used, is not influenceed by neutral grounding in distribution power network and broken position, can recognize that broken string is earth-free Failure and broken string load side earth fault.
- The recognition methods 2. power distribution network according to claim 1 breaks, it is characterised in that the recognition methods further comprises Following steps：Step one：The three-phase voltage of bus and the three-phase current of every outlet are gathered in transformer station；Step 2：The power frequency amplitude of bus three-phase voltage is extracted by fft algorithm；Step 3：Calculate the Sudden Changing Rate of bus three-phase voltage amplitude；Mutually raised if it is judged that bus three-phase electricity is pressed with one, in addition Two-phase is reduced, then carries out step 4, recalculated if it is not the case, then returning to step one；Step 4：The amplitude of each outlet three-phase current is proposed by fft algorithm, if voltage rise phase in any certain outlet Electric current is 0, then carries out step 5, if the voltage rise phase current of all outlets is not 0, is counted at the beginning from step again Calculate；Step 5：Voltage is selected to raise the phase mutually occurred for broken string, voltage reduction is mutually to perfect phase；Step 6：Calculate the coefficient correlation that all outlets perfect biphase current；Step 7：Seek the absolute value of all outlet coefficient correlations；Step 8：Compare the size of all outlet coefficient correlation absolute values, maximum of which is exactly faulty line.
- The recognition methods 3. power distribution network according to claim 2 breaks, it is characterised in that bus three-phase is calculated by formula (1) The Sudden Changing Rate of voltage magnitude；WhereinThe Sudden Changing Rate of phase voltage amplitude is represented,For the amplitude of phase voltage after failure,Represent phase voltage before failure Amplitude；The Sudden Changing Rate of phase voltage amplitude is more than 0, represents phase voltage rise, and the Sudden Changing Rate of phase voltage amplitude is less than 0, represents drop It is low.
- The recognition methods 4. power distribution network according to claim 2 breaks, it is characterised in that all outlets are calculated by formula (2) Perfect the coefficient correlation of biphase current：ρxyCoefficient correlation is represented, N is the sampling number in a cycle, and x (n) and y (n) represent that two perfect phase respectively；Two frequencies When rate identical sinusoidal quantity phase differs 120 °, coefficient correlation is -0.5, when two frequency identical sinusoidal quantity phase differences At 180 °, coefficient correlation is -1.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375030A (en) * | 2018-09-06 | 2019-02-22 | 深圳供电局有限公司 | High-voltage overhead line disconnection fault identification method and device |
| CN109950891A (en) * | 2019-03-29 | 2019-06-28 | 云南电网有限责任公司电力科学研究院 | Tracking compensation technique is compensated entirely based on the controllable voltage source for perfecting phase phase voltage amplitude |
| CN111614065A (en) * | 2020-05-07 | 2020-09-01 | 国网四川省电力公司 | Line disconnection protection method based on line parameter identification |
| CN113848429A (en) * | 2021-10-15 | 2021-12-28 | 国网陕西省电力公司电力科学研究院 | Power distribution network single-phase line break fault protection method and system |
| CN114089098A (en) * | 2021-10-25 | 2022-02-25 | 珠海许继电气有限公司 | Power distribution network fault type identification method and device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109375030A (en) * | 2018-09-06 | 2019-02-22 | 深圳供电局有限公司 | High-voltage overhead line disconnection fault identification method and device |
| CN109950891A (en) * | 2019-03-29 | 2019-06-28 | 云南电网有限责任公司电力科学研究院 | Tracking compensation technique is compensated entirely based on the controllable voltage source for perfecting phase phase voltage amplitude |
| CN111614065A (en) * | 2020-05-07 | 2020-09-01 | 国网四川省电力公司 | Line disconnection protection method based on line parameter identification |
| CN113848429A (en) * | 2021-10-15 | 2021-12-28 | 国网陕西省电力公司电力科学研究院 | Power distribution network single-phase line break fault protection method and system |
| CN114089098A (en) * | 2021-10-25 | 2022-02-25 | 珠海许继电气有限公司 | Power distribution network fault type identification method and device |
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Application publication date: 20170804 |