CN106569075B - Main transformer and high-pressure side cable zero sequence differential protection polarity hookup and method - Google Patents
Main transformer and high-pressure side cable zero sequence differential protection polarity hookup and method Download PDFInfo
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- CN106569075B CN106569075B CN201510649753.XA CN201510649753A CN106569075B CN 106569075 B CN106569075 B CN 106569075B CN 201510649753 A CN201510649753 A CN 201510649753A CN 106569075 B CN106569075 B CN 106569075B
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- zero sequence
- main transformer
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- cable
- differential protection
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- 238000004088 simulation Methods 0.000 claims abstract description 3
- 230000001264 neutralization Effects 0.000 claims description 26
- 238000004804 winding Methods 0.000 claims description 13
- 238000010998 test method Methods 0.000 claims description 9
- 230000001681 protective Effects 0.000 claims description 8
- 238000001514 detection method Methods 0.000 claims description 6
- 230000000994 depressed Effects 0.000 claims description 5
- 230000005611 electricity Effects 0.000 claims description 4
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000003287 optical Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000002955 isolation Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- SFZCNBIFKDRMGX-UHFFFAOYSA-N Sulfur hexafluoride Chemical compound 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- 238000006243 chemical reaction Methods 0.000 description 1
- 235000005035 ginseng Nutrition 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 230000001105 regulatory Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 229960000909 sulfur hexafluoride Drugs 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
Classifications
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
Abstract
The invention discloses a kind of main transformer and high-pressure side cable zero sequence differential protection polarity hookup and methods, the hookup stops under labour state in main transformer and high-voltage side bus, connect maintenance power supply, adjust single-phase voltage regulator, output current to appropriate value, then formed by maintenance power supply-single-phase voltage regulator TT- isolating transformer TI- ammeter-main transformer high-pressure side Y shape three-phase windings-main transformer high-pressure side cable-main transformer high-pressure side route plug-in strip Q9-GIS circuit breaker Q 0- positive pole plug-in strip Q1(or secondary mother plug-in strip Q2)-positive pole earthing switch blade QG1(or secondary mother's earthing switch blade) current loop that constitutes of-grounded screen-the earth, the electric current has flowed through the primary of the first zero sequence current mutual inductor ZCT1 and the second zero sequence current mutual inductor ZCT2 of zero sequence differential protection 87GMC The polarity of main transformer and high-pressure side cable zero sequence differential protection is tested using the loop current and is checked in side, the simulation of zero-sequence current when realizing primary system external earth-fault.
Description
Technical field
The present invention relates to a kind of main transformer and high-pressure side cable zero sequence differential protection polarity hookup and test method,
And the case where being suitable for main transformer and high-pressure side cable zero sequence differential protection two sides ZCT mounting distance farther out.
Background technique
Main transformer and high-pressure side cable zero sequence differential protection 87GMC, be used as main transformer high-pressure side Y shape winding and
Main protection when ground fault occurs for high-pressure side cable has especially for main transformer neutral point grounded system via resistance
The characteristics of reacting high ground-fault sensitivity, quick action, protects movement in 0 second in unit full cut-off, i.e. tripping main transformer is high
It presses the total low pressure side switch of side GIS breaker, factory, generator field switch, close steam turbine main inlet throttle-stop valve.Main transformer and high-pressure side
For cable zero sequence differential protection there are two types of type, the first seed type is guiding line style zero sequence differential protection, referring to Fig. 1 left-hand component,
Differential protection 87GMC is electric by the first zero sequence current mutual inductor ZCT1 and secondary side for being installed on main transformer neutral point
Cable, the second zero sequence current mutual inductance being installed in main transformer high-pressure side cable end piece GIS breaker (sulfur hexafluoride breaker)
It device ZCT2 and secondary side cable and is installed on Power Plant Side and is constituted close to differential protection relay of generator G etc..Another seed type
It is optical differential type zero sequence differential protection, left-hand component referring to fig. 2, differential protection 87GMC is by two differential guarantors
Protection unit is constituted, and two differential protections are connected and communicated by optical fiber, and first differential protection is by being installed on main transformer pressure
The the first zero sequence current mutual inductor ZCT1 and secondary side cable of device neutral point, it is installed on differential guarantor of the Power Plant Side close to generator G
Relay etc. is protected to constitute, second differential protection by be installed in the cable end piece GIS breaker of main transformer high-pressure side second
Zero sequence current mutual inductor ZCT2 and secondary side cable, the differential protection relay for being installed on transformer substation side etc. are constituted.
Main transformer and the characteristics of high-pressure side cable zero sequence differential protection 87GMC are that main transformer high pressure is flowed through in detection
Zero-sequence current in side Y shape winding and high-pressure side cable, the first zero sequence current mutual inductor ZCT1 and the second zero sequence current mutual inductor
Distance is relatively far away between ZCT2.The polarity correctness of main transformer and high-pressure side cable zero sequence differential protection 87GMC,
Directly influence the correctness of protection act.And zero sequence differential protection polarity test, being one makes us the problem of perplexing, by
When generator G- main transformer MTR unit operates normally, protected device (main transformer and high-pressure side cable) primary circuit
In only forward-order current, zero-sequence current is not present, thus can not examine zero sequence differential protection polar with load current
Correctness.However, such as often resulting in without main transformer and high-pressure side cable zero sequence differential protection polarity test due to zero
Sequence differential protection incorrect polarity and external system occur ground fault when malfunction chaser accident, cause economic damage
It loses.
Summary of the invention
The purpose of the present invention is to provide a kind of main transformer and high-pressure side cable zero sequence differential protection polarity hookups
And method, the hookup and method can accurately, easily carry out main transformer and high-pressure side cable zero sequence differential protection
Polarity test, it is ensured that the polar correctness of zero sequence differential protection, zero sequence differential protection malfunction when preventing the external earth fault in area
Make, occur the problem of zero sequence differential protection refused action when ground fault in area.
In order to achieve the above technical purposes, the present invention adopts the following technical scheme:
A kind of main transformer and high-pressure side cable zero sequence differential protection polarity hookup, the main transformer and high-pressure side
Cable zero sequence differential protection 87GMC by the first zero sequence current mutual inductor ZCT1 be installed on main transformer high-pressure side Y shape around
Group neutral lead, the second zero sequence current mutual inductor ZCT2 are installed in the cable end piece GIS breaker of main transformer high-pressure side,
The high-pressure side main transformer MTR is after high-tension cable series transformer route plug-in strip Q9 and GIS circuit breaker Q 0 and meets positive pole plug-in strip Q1
With secondary female plug-in strip Q2；The Y shape winding neutral lead of main transformer high-pressure side connect main transformer neutral point earthing switch blade QN and
Resistance R is followed by grounded screen lead-out wire；
The hookup further includes maintenance power supply, single-phase voltage regulator TT, isolating transformer TI, ammeter, positive pole ground connection
Plug-in strip QG1, secondary female earthing switch blade；
The maintenance plant-grid connection single-phase voltage regulator TT input terminal, single-phase voltage regulator TT output end are connected to isolating transformer
TI input terminal, isolating transformer TI export one end concatenation ammeter and are followed by the front end main transformer neutral point earthing switch blade QN, the
One rear end zero sequence current mutual inductor ZCT1, isolating transformer TI output is another to be terminated at grounded screen lead-out wire；
The positive pole plug-in strip Q1 other end external cable is followed by the one end positive pole earthing switch blade QG1, and positive pole earthing switch blade QG1 is another
One end is connected to grounded screen lead-out wire, and secondary mother's plug-in strip Q2 other end external cable is followed by secondary female earthing switch blade, and secondary mother's earthing switch blade is another
One end is connected to grounded screen lead-out wire.
A kind of main transformer and high-pressure side cable zero sequence differential protection polarity test method, it is female in main transformer and high-pressure side
Line stops under labour state, will overhaul plant-grid connection single-phase voltage regulator TT input terminal, and single-phase voltage regulator TT output end is connected to isolation and becomes
Depressor TI input terminal, isolating transformer TI export one end concatenation ammeter and are followed by before main transformer neutral point earthing switch blade QN
End, the first rear end zero sequence current mutual inductor ZCT1, isolating transformer TI output is another to be terminated at grounded screen lead-out wire；Positive pole ground connection
Mono- end plug-in strip QG1 is connected to the cable that positive pole plug-in strip Q1 is connected to, and positive pole earthing switch blade QG1 is another to be terminated at grounded screen lead-out wire, pair
Female one end of earthing switch blade is connected to the cable that pair mother plug-in strip Q2 is connected to, and secondary female earthing switch blade is another is terminated at grounded screen lead-out wire；
Close main transformer route plug-in strip Q9, GIS circuit breaker Q 0, positive pole plug-in strip Q1(or secondary mother plug-in strip Q2), positive pole is grounded
The female earthing switch blade of plug-in strip QG1(or secondary), main transformer neutral point earthing switch blade QN is remained off；
Maintenance power supply is connected, single-phase voltage regulator TT is adjusted, outputs current to appropriate value, then is formed mono- by maintenance power supply-
Phase voltage regulator TT- isolating transformer TI- ammeter-main transformer high-pressure side Y shape three-phase windings-main transformer high-pressure side cable-
Main transformer high-pressure side route plug-in strip Q9-GIS circuit breaker Q 0- positive pole plug-in strip Q1(or secondary mother plug-in strip Q2)-positive pole earthing switch blade QG1
The current loop that (or secondary female earthing switch blade)-grounded screen-the earth is constituted, the electric current have flowed through zero sequence differential protection 87GMC
The first zero sequence current mutual inductor ZCT1 and the second zero sequence current mutual inductor ZCT2 primary side, realize and connect outside primary system
The simulation of zero-sequence current when earth fault tests using the loop current and checks that main transformer and high-pressure side cable zero sequence are differential
The polarity of protective device 87GMC；
After hookup is passed through electric current: the first zero sequence current mutual inductor of detection zero sequence differential protection 87GMC
The phase of ZCT1 and the second zero sequence current mutual inductor ZCT2 secondary side input current is with the protective device 87GMC polar end
Reference polarity, if about 180 ° of the two phase phase difference, main transformer and high-pressure side cable zero sequence differential protection 87GMC polarity
Correctly, if about 0 ° of the two phase phase difference, main transformer and high-pressure side cable zero sequence differential protection 87GMC polarity are reversed.
Further, the first zero sequence is detected from zero sequence differential protection 87GMC connecting terminal with embedding shape current phase table
The phase of current transformer ZCT1 and the second zero sequence current mutual inductor ZCT2 secondary side input current.
Further, the first zero sequence current mutual inductor ZCT1 and the 2nd 0 is detected inside zero sequence differential protection 87GMC
The phase of sequence current transformer ZCT2 secondary side input current.
Main transformer of the present invention and high-pressure side cable zero sequence differential protection polarity hookup and method and prior art phase
Than the present invention can accurately, easily carry out main transformer and high-pressure side cable zero sequence differential protection polarity test, it is ensured that zero
The polar correctness of sequence differential protection, zero sequence differential protection misoperation when preventing the external earth fault in area, ground fault in area
When zero sequence differential protection refused action the problem of occur.
Detailed description of the invention
Fig. 1 is main transformer of the present invention and high-pressure side cable zero sequence differential protection polarity hookup schematic diagram (guide wire
Type zero sequence differential protection)；
Fig. 2 is that (optical fiber is poor for main transformer of the present invention and high-pressure side cable zero sequence differential protection polarity hookup schematic diagram
Ejector half zero sequence differential protection).
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples.
Referring to Fig. 1 and Fig. 2, a kind of main transformer and high-pressure side cable zero sequence differential protection polarity hookup, the master
Transformer and high-pressure side cable zero sequence differential protection 87GMC are installed on main transformer pressure by the first zero sequence current mutual inductor ZCT1
The Y shape winding neutral lead of device high-pressure side, the second zero sequence current mutual inductor ZCT2 are installed on main transformer high-pressure side cable end
It holds in GIS circuit breaker Q 0.Main transformer height is flowed through in main transformer and high-pressure side cable zero sequence differential protection 87GMC, reaction
It presses side Y shape winding and high-pressure side cable zero-sequence current and acts.The high-pressure side main transformer MTR is through high-tension cable series transformer line
After switch knife Q9 and GIS circuit breaker Q 0 and meet positive pole plug-in strip Q1 and secondary female plug-in strip Q2；Main transformer high-pressure side Y shape winding neutral point
Lead-out wire series connection main transformer neutral point earthing switch blade QN and resistance R is followed by grounded screen lead-out wire.
The hookup further includes maintenance power supply, single-phase voltage regulator TT, isolating transformer TI, ammeter, positive pole ground connection
Plug-in strip QG1, secondary female earthing switch blade, the maintenance power supply (alternating current 220V or 380V) accesses single-phase voltage regulator TT input terminal, single-phase
Pressure regulator TT output end is connected to isolating transformer TI input terminal, and isolating transformer TI exports one end concatenation ammeter and is followed by master
The front end transformer neutral point earthing switch blade QN, the first rear end zero sequence current mutual inductor ZCT1, isolating transformer TI export the other end
It is connected to grounded screen lead-out wire.Using pressure regulator, keep loop current adjustable, using isolating transformer, makes experiment power supply and primary system
System isolation, tests using the loop current and checks that main transformer and high-pressure side cable zero sequence differential protection are polar just
True property.
The positive pole plug-in strip Q1 other end external cable is followed by the one end positive pole earthing switch blade QG1, and positive pole earthing switch blade QG1 is another
One end is connected to grounded screen lead-out wire, and secondary mother's plug-in strip Q2 other end external cable is followed by secondary female earthing switch blade, and secondary mother's earthing switch blade is another
One end is connected to grounded screen lead-out wire.
Hookup basic principle of the invention is: stopping using as a servant shape in main transformer and high-voltage side bus (positive pole or secondary female)
Under state, from one electricity of injection between the main transformer high-pressure side Y shape winding neutral ground front end plug-in strip QN and grounded screen lead-out wire
Stream, allows the electric current to flow through from the first zero sequence current mutual inductor ZCT1 from main transformer MTR neutral point to high-pressure side cable end piece GIS
The primary circuit of second zero sequence current mutual inductor ZCT2 in breaker, using main transformer high-voltage side bus three-phase ground lock
Knife, grounded screen, the earth constitute test loop.If flowing through the electric current of the first zero sequence current mutual inductor ZCT1 at main transformer neutral point
For I0 , since main transformer is identical with the zero sequence impedance three-phase of high-pressure side cable, then the electric current flows into main transformer high-pressure side Y shape
After winding and high-pressure side cable, become that three-phase is equal in magnitude, the identical electric current of phase, every phase current size is I0/ 3, using
Main transformer high-pressure side route plug-in strip Q9, GIS circuit breaker Q 0, positive pole plug-in strip Q1 (or secondary mother plug-in strip Q2), positive pole earthing switch blade QG1
After (or secondary female earthing switch blade), with I0The earth is flowed into, material is thus formed zero-sequence current accesses, have truly simulated main transformer
And the case where when the external earth fault in high-pressure side cable area.Since main transformer uses -11 mode of connection of Y/ Δ, when the side Y winding
When flowing through zero-sequence current, Δ side winding zero-sequence current then forms loop, may not flow into generator G winding.The present invention utilizes the examination
Testing loop current accurately can test and analyze the correctness of main transformer and high-pressure side cable zero sequence differential protection polarity, with
Ensure in main transformer and the operation of high-pressure side cable in generating region zero sequence differential protection action message when ground fault, outside generating region
Zero sequence differential protection is reliably failure to actuate when ground fault.
A kind of main transformer and high-pressure side cable zero sequence differential protection polarity test method are based on main transformer and high pressure
Side cable zero sequence differential protection polarity hookup.
Main transformer 110KV positive pole (or secondary female) is vacated first for this test.Plant-grid connection single-phase voltage regulator will be overhauled
TT input terminal, single-phase voltage regulator TT output end are connected to isolating transformer TI input terminal, and isolating transformer TI exports one end concatenation
Ammeter is followed by that transformation is isolated in the front end main transformer neutral point earthing switch blade QN, the first rear end zero sequence current mutual inductor ZCT1
Device TI output is another to be terminated at grounded screen lead-out wire.Mono- end positive pole earthing switch blade QG1 is connected to the cable that positive pole plug-in strip Q1 is connected to, just
Female earthing switch blade QG1 is another to be terminated at grounded screen lead-out wire, and one end of secondary mother's earthing switch blade is connected to the cable that pair mother plug-in strip Q2 is connected to,
It is secondary female that earthing switch blade is another is terminated at grounded screen lead-out wire.
Then, close main transformer route plug-in strip Q9, GIS circuit breaker Q 0, positive pole plug-in strip Q1(or secondary mother plug-in strip Q2), positive pole
The female earthing switch blade (not shown) of earthing switch blade QG1(or secondary), main transformer neutral point earthing switch blade QN is remained off.
It connects alternating current 220V or 380V overhauls power supply, adjust single-phase voltage regulator TT, output current to appropriate numerical value, make first
Zero sequence current mutual inductor ZCT1 and the second zero sequence current mutual inductor ZCT2 secondary side current, which meet embedding shape current phase table detection, to be wanted
It asks or zero sequence differential protection 87GMC testing requirements, is then formed by maintenance power supply-single-phase voltage regulator TT- isolating transformer TI-
Ammeter-main transformer high-pressure side Y shape three-phase windings-main transformer high-pressure side cable-main transformer high-pressure side route plug-in strip
Q9-GIS circuit breaker Q 0-positive pole plug-in strip Q1(or secondary mother plug-in strip Q2)-the female earthing switch blade of positive pole earthing switch blade QG1(or secondary)-it connects
The current loop that earth mat-the earth is constituted, the electric current have flowed through the first zero sequence current mutual inductor of zero sequence differential protection 87GMC
The primary side of ZCT1 and the second zero sequence current mutual inductor ZCT2, the mould of zero-sequence current when realizing primary system external earth-fault
It is quasi-, the polarity of main transformer and high-pressure side cable zero sequence differential protection 87GMC is tested and checked using the loop current.
After hookup is passed through electric current: (1) for guiding line style zero sequence differential protection, referring to Fig. 1, with embedding shape electricity
Stream phase meter detects the first zero sequence current mutual inductor ZCT1 and the second zero sequence from zero sequence differential protection 87GMC connecting terminal
The phase of current transformer ZCT2 secondary side input current is ginseng with the protective device 87GMC polar end (the band end * in figure)
Polarity is examined, if about 180 ° of the two phase phase difference, main transformer and high-pressure side cable zero sequence differential protection 87GMC polarity are just
Really；If about 0 ° of the two phase phase difference, main transformer and high-pressure side cable zero sequence differential protection 87GMC polarity are reversed.(2)
For optical differential type zero sequence differential protection, referring to fig. 2, the detection the 1st inside zero sequence differential protection 87GMC
The phase of sequence current transformer ZCT1 and the second zero sequence current mutual inductor ZCT2 secondary side input current check difference current, system
The size of streaming current, if about 180 ° of the phase phase difference of the two input current, difference current zero, stalling current is not zero, and (it is counted
Value can be calculated by protective device stalling current formula), then main transformer and the high-pressure side pole cable zero sequence differential protection 87GMC
Property is correct；Conversely, if about 0 ° of the phase phase difference of the two input current, stalling current zero, difference current is not zero, and (its numerical value can
Calculated by protective device difference current formula), then main transformer and high-pressure side cable zero sequence differential protection polarity are reversed.Sentence
It is disconnected go out main transformer and high-pressure side cable zero sequence differential protection polarity it is reversed after, side zero sequence current mutual inductor should be changed
ZCT circuit connection.
Embodiment
Certain factory's import 350MW transformer unit system, is mounted with that optical differential type main transformer and high-pressure side cable zero sequence are differential
Protection carries out main transformer and high-pressure side cable zero sequence differential protection polarity by hookup of the invention and test method
When test, referring to fig. 2,40A electric current is injected from the main transformer neutral point front end earthing switch blade QN, inside protective device 87GMC
Data measured is shown in Table 1:
Table 1
Test method according to the present invention analyzes above-mentioned 1 test data of table, can determine whether out main transformer and high pressure
Side cable zero sequence differential protection 87GMC polarity is mistake, after changing side zero sequence current mutual inductor ZCT circuit connection, then
Secondary to be tested, measurement data is shown in Table 2:
Table 2
Test method according to the present invention analyzes above-mentioned 2 test data of table, can determine whether out main transformer and high pressure
Side cable zero sequence differential protection 87GMC polarity is correct.
Embodiment test when it should be noted that 1. test in Injection Current size, should be according to protection zero sequence current mutual inductor
The no-load voltage ratio of ZCT determines, meets the requirement of test instrumentation and protective device measuring accuracy.2. the capacity of testing equipment, Ying Gen
According to depending on the size of primary circuit zero sequence impedance when test and Injection Current, due to main transformer neutral point resistance grounded, zero
The no-load voltage ratio of sequence current transformer ZCT is protected much smaller than phase fault uses CT no-load voltage ratio, thus general capacity test equipment (single-phase voltage regulating
Device, isolating transformer) it can meet the requirements.
The above is merely preferred embodiments of the present invention, be not intended to limit the scope of the present invention, therefore, it is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention should be included in protection model of the invention
Within enclosing.
Claims (4)
1. a kind of main transformer and high-pressure side cable zero sequence differential protection polarity hookup, the main transformer and high-pressure side electricity
Cable zero sequence differential protection 87GMC is installed on main transformer high-pressure side Y shape winding by the first zero sequence current mutual inductor ZCT1
Neutral lead, the second zero sequence current mutual inductor ZCT2 are installed in the cable end piece GIS breaker of main transformer high-pressure side, main
The high-pressure side transformer MTR after high-tension cable series transformer route plug-in strip Q9 and GIS circuit breaker Q 0 and connect positive pole plug-in strip Q1 and
Secondary mother's plug-in strip Q2；Main transformer high-pressure side Y shape winding neutral lead series connection main transformer neutral point earthing switch blade QN and electricity
Resistance R is followed by grounded screen lead-out wire；
It is characterized in that: the hookup further includes maintenance power supply, single-phase voltage regulator TT, isolating transformer TI, ammeter, positive pole
Earthing switch blade QG1, secondary female earthing switch blade；
The maintenance plant-grid connection single-phase voltage regulator TT input terminal, it is defeated that single-phase voltage regulator TT output end is connected to isolating transformer TI
Enter end, isolating transformer TI exports one end concatenation ammeter and is followed by the front end main transformer neutral point earthing switch blade QN, the 1st
The rear end sequence current transformer ZCT1, isolating transformer TI output is another to be terminated at grounded screen lead-out wire；
The positive pole plug-in strip Q1 other end external cable is followed by the one end positive pole earthing switch blade QG1, the positive pole earthing switch blade QG1 other end
It is connected to grounded screen lead-out wire, secondary mother's plug-in strip Q2 other end external cable is followed by secondary female earthing switch blade, secondary mother's earthing switch blade other end
It is connected to grounded screen lead-out wire.
2. a kind of main transformer and high-pressure side cable zero sequence differential protection polarity test method, it is characterized in that:
In the case where main transformer and high-voltage side bus stop labour state, plant-grid connection single-phase voltage regulator TT input terminal, single-phase tune will be overhauled
Depressor TT output end is connected to isolating transformer TI input terminal, and isolating transformer TI exports one end concatenation ammeter and is followed by main transformer
The front end depressor neutral ground plug-in strip QN, the first rear end zero sequence current mutual inductor ZCT1, isolating transformer TI export another termination
In grounded screen lead-out wire；Mono- end positive pole earthing switch blade QG1 is connected to the cable that positive pole plug-in strip Q1 is connected to, and positive pole earthing switch blade QG1 is another
One end is connected to grounded screen lead-out wire, and one end of secondary mother's earthing switch blade is connected to the cable that pair mother plug-in strip Q2 is connected to, and secondary mother's earthing switch blade is another
One end is connected to grounded screen lead-out wire；
Close the female plug-in strip Q2 of main transformer route plug-in strip Q9, GIS circuit breaker Q 0, positive pole plug-in strip Q1 or secondary, positive pole earthing switch blade QG1
Or secondary female earthing switch blade, main transformer neutral point earthing switch blade QN are remained off；
Maintenance power supply is connected, single-phase voltage regulator TT is adjusted, outputs current to appropriate value, then is formed by maintenance power supply-single-phase tune
Depressor TT- isolating transformer TI- ammeter-main transformer high-pressure side Y shape three-phase windings-main transformer high-pressure side cable-main transformer
Depressor high-pressure side route plug-in strip Q9-GIS circuit breaker Q 0- positive pole plug-in strip Q1 or pair mother plug-in strip Q2- positive pole earthing switch blade QG1 or secondary is female
The current loop that earthing switch blade-grounded screen-the earth is constituted, the electric current have flowed through the 1st of zero sequence differential protection 87GMC
The primary side of sequence current transformer ZCT1 and the second zero sequence current mutual inductor ZCT2, when realizing primary system external earth-fault
Main transformer and high-pressure side cable zero sequence differential protection are tested using the loop current and are checked in the simulation of zero-sequence current
The polarity of 87GMC；
After hookup is passed through electric current: detection zero sequence differential protection 87GMC the first zero sequence current mutual inductor ZCT1 and
The phase of second zero sequence current mutual inductor ZCT2 secondary side input current is with reference to pole with the protective device 87GMC polar end
Property, if 180 ° of the two phase phase difference, main transformer and high-pressure side cable zero sequence differential protection 87GMC polarity are correct, if
0 ° of the two phase phase difference, then main transformer and high-pressure side cable zero sequence differential protection 87GMC polarity are reversed.
3. main transformer according to claim 2 and high-pressure side cable zero sequence differential protection polarity test method, feature
It is: detects the first zero sequence current mutual inductor from zero sequence differential protection 87GMC connecting terminal with embedding shape current phase table
The phase of ZCT1 and the second zero sequence current mutual inductor ZCT2 secondary side input current.
4. main transformer according to claim 2 and high-pressure side cable zero sequence differential protection polarity test method, feature
It is: the first zero sequence current mutual inductor ZCT1 of detection and the second zero sequence current mutual inductor inside zero sequence differential protection 87GMC
The phase of ZCT2 secondary side input current.
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| CN109444644B (en) * | 2018-12-21 | 2020-12-29 | 南京国电南自电网自动化有限公司 | Transient component differential-based power distribution network single-phase earth fault line selection method |
| CN110850205B (en) * | 2019-11-12 | 2021-08-27 | 中车长春轨道客车股份有限公司 | Auxiliary device for differential flow monitoring test of motor train unit |
| CN111257798B (en) * | 2020-01-16 | 2022-05-10 | 江苏广识电气有限公司 | Method for detecting polarity of zero sequence current of line selection and automatically correcting |
| CN113030620A (en) * | 2021-03-16 | 2021-06-25 | 马鞍山钢铁股份有限公司 | Transformer differential protection phasor test system and method |
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