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 PDF

Info

Publication number
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
Authority
CN
China
Prior art keywords
zero sequence
main transformer
pressure
cable
differential protection
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201510649753.XA
Other languages
Chinese (zh)
Other versions
CN106569075A (en
Inventor
罗毅
王丽华
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Baoshan Iron and Steel Co Ltd
Original Assignee
Baoshan Iron and Steel Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Baoshan Iron and Steel Co Ltd filed Critical Baoshan Iron and Steel Co Ltd
Priority to CN201510649753.XA priority Critical patent/CN106569075B/en
Publication of CN106569075A publication Critical patent/CN106569075A/en
Application granted granted Critical
Publication of CN106569075B publication Critical patent/CN106569075B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01RMEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R31/00Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
    • G01R31/50Testing 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

Main transformer and high-pressure side cable zero sequence differential protection polarity hookup and method
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.
CN201510649753.XA 2015-10-10 2015-10-10 Main transformer and high-pressure side cable zero sequence differential protection polarity hookup and method Active CN106569075B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201510649753.XA CN106569075B (en) 2015-10-10 2015-10-10 Main transformer and high-pressure side cable zero sequence differential protection polarity hookup and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201510649753.XA CN106569075B (en) 2015-10-10 2015-10-10 Main transformer and high-pressure side cable zero sequence differential protection polarity hookup and method

Publications (2)

Publication Number Publication Date
CN106569075A CN106569075A (en) 2017-04-19
CN106569075B true CN106569075B (en) 2019-02-05

Family

ID=58507701

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201510649753.XA Active CN106569075B (en) 2015-10-10 2015-10-10 Main transformer and high-pressure side cable zero sequence differential protection polarity hookup and method

Country Status (1)

Country Link
CN (1) CN106569075B (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101587157A (en) * 2009-06-26 2009-11-25 河南省电力公司商丘供电公司 Bus differential protection polarity test method
CN101614798A (en) * 2009-07-22 2009-12-30 天津市电力公司 Polarity detection system of electronic transformer
CN101907670A (en) * 2010-06-25 2010-12-08 江苏省电力公司泗洪县供电公司 Method for verifying correctness of transformer differential protection secondary connection loop
CN203204109U (en) * 2013-04-24 2013-09-18 中铁电气化局集团有限公司 Differential protection field calibration device of transformer

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5972097B2 (en) * 2012-08-08 2016-08-17 一般財団法人関東電気保安協会 High voltage insulation monitoring device and high voltage insulation monitoring method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101587157A (en) * 2009-06-26 2009-11-25 河南省电力公司商丘供电公司 Bus differential protection polarity test method
CN101614798A (en) * 2009-07-22 2009-12-30 天津市电力公司 Polarity detection system of electronic transformer
CN101907670A (en) * 2010-06-25 2010-12-08 江苏省电力公司泗洪县供电公司 Method for verifying correctness of transformer differential protection secondary connection loop
CN203204109U (en) * 2013-04-24 2013-09-18 中铁电气化局集团有限公司 Differential protection field calibration device of transformer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
"变压器零序差动保护电流互感器极性校对方法探讨";彭金宁等;《研究与分析》;20091231(第12期);全文

Also Published As

Publication number Publication date
CN106569075A (en) 2017-04-19

Similar Documents

Publication Publication Date Title
CN106569075B (en) Main transformer and high-pressure side cable zero sequence differential protection polarity hookup and method
CN102608495B (en) Fault phase selection method based on current break variable
CN102540001B (en) Method of checking alternating current loop of a 500kV transformer substation through carrying out simulated through-type three-phase short circuit
EP3069426B1 (en) Method and apparatus of reactor turn-to-turn protection
CN205080251U (en) Through -flow calibration system of current transformer secondary circuit
CN102510010B (en) Method for checking and testing relay protection vector before operation of newly-built transformer station
CN103293446A (en) Small-current grounding fault line selection method based on arc suppression coil
CN102608485B (en) Detection method for zero-sequence current loops of transformer substations
CN105425107B (en) A kind of method and its system of active power distribution network fault diagnosis and location
CN102565618A (en) Method for detecting zero-sequence voltage circuit of transformer substation
CN106802361B (en) A kind of capacitance current measurement method and system of distribution mixed connection ground connection operation
CN105785157A (en) Double main transformer longitudinal differential protection loop closing testing method
CN109324269A (en) Power distribution network single-phase disconnection fault identification method based on distributed measurement
CN104345245A (en) Method for checking voltage transformer wiring correctness by using transformer turn ratio & group tester
CN109188205A (en) A kind of distance measuring method of the distance protection based on petal type power grid
CN102944762B (en) Debugging method of phase sequences of loops at two sides of synchronization point before commissioning of generator set
CN106353564A (en) Power system short-circuit current acquiring method for meter and V/X wiring traction transformer
CN107831378B (en) Device and method for detecting compensation effect of arc suppression coil
CN110045188A (en) A kind of system and method for not removing high-side lead measuring transformer insulation resistance
CN103683230B (en) The implementation method of a kind of system for distribution network of power distance protection and structure
CN103743994B (en) Low-voltage load test method and device
CN105319478A (en) Un-disassembly polarity and transformation ratio testing method for transformer bushing
CN104991144B (en) Generator arc suppression coil compensation recognition methods based on transfer overvoltage characteristic frequency
CN110031718B (en) Method for verifying integrity of alternating current circuit by pressurizing low-voltage side of railway traction station
WO2020191825A1 (en) Phase-relationship-based method for single-phase disconnection fault identification in power distribution network

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant