CN104267276B - Method high-tension motor longitudinal differential protection checked with low pressure locked rotor current - Google Patents
Method high-tension motor longitudinal differential protection checked with low pressure locked rotor current Download PDFInfo
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- CN104267276B CN104267276B CN201410487550.0A CN201410487550A CN104267276B CN 104267276 B CN104267276 B CN 104267276B CN 201410487550 A CN201410487550 A CN 201410487550A CN 104267276 B CN104267276 B CN 104267276B
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Abstract
The present invention is specially the method checked to high-tension motor longitudinal differential protection with low pressure locked rotor current；It is characterized in that：It includes step 1, high-tension motor primary circuit is checked；Step 2, to high-tension motor longitudinal differential protection secondary current circuit connection check；Step 3, apply three-phase alternating current low-voltage in high-tension motor switch cabinet outlet side current transformer front end, motor is made in nature locked rotor condition, and the electric current for meeting longitudinal differential protection inspection requirements is produced in differential secondary circuit is indulged；Step 4, the longitudinal differential protection to high-tension motor carry out comprehensively, the inspection of system；Step 5, open test low-tension supply simultaneously remove all interim trial lines.The revolution electric current that the locked rotor current that this method is produced is produced closer under motor normal operation; can be to the wiring in first and second loop of whole longitudinal differential protection and polarity; major parameter setting of relay etc. carries out the inspection of comprehensive and system, it can be ensured that safety when motor is run first.
Description
Technical field
The present invention relates to the inspection method of power system, specially indulges differential guarantor with low pressure locked rotor current to high-tension motor
The method checked by shield.
Background technology
High-tension motor is the motor or capacity of the equipment commonly used in power system, usual 2MW and the above in below 2MW
But current quick can not meet the motor of sensitivity requirement, all install longitudinal differential protection and be used as motor stator winding
And the main protection of cable tail phase fault.When high-tension motor is newly installed or Jing after overhaul, its differential circuit wiring, guarantor
Shield relay parameter is arranged and is adjusted, and need to carry out necessary inspection and test.At present usual method and its have the disadvantage 1,
Check polarity and the wiring of differential secondary circuit, it is impossible to which comprehensive and systematic inspection is carried out to first and second loop of whole differential protection；
2nd, before high-tension motor is operated first, longitudinal differential protection is exited, in motor production run, using the operating electricity of motor
Stream carrying out systems inspection to whole longitudinal differential protection loop, confirm it is errorless after, then put into longitudinal differential protection, though so can be to difference
Dynamic loop carries out the inspection of system but motor has certain security risk when running first.
The content of the invention
It is an object of the present invention to the electric current produced in utilizing locked rotor current simulation motor starting and running,
Closer to motor true operating condition in the case of motor longitudinal differential protection loop is carried out comprehensively, the inspection of system.
In order to achieve the above object, the present invention is realized in；
A kind of method high-tension motor longitudinal differential protection checked with low pressure locked rotor current；It includes following steps
Suddenly；
Step 1, high-tension motor primary circuit is checked；
Step 2, high-tension motor longitudinal differential protection secondary current circuit connection is checked, it is ensured that entirely indulge differential guarantor
In shield loop, the corresponding each corresponding relation in first and second side of motor both sides current transformer is correct, Current Transformer Secondary
Vertical differential circuit（Containing current transformer, protective relay）Do not open a way, longitudinal differential protection secondary current loop has been grounded and has only existed
It is grounded at one；
Step 3, high-tension motor switch cabinet outlet side current transformer front end apply three-phase alternating current low-voltage, make electronic
Machine is in nature locked rotor condition, and the electric current for meeting longitudinal differential protection inspection requirements is produced in differential secondary circuit is indulged；
Step 4, the longitudinal differential protection to high-tension motor carry out comprehensively, the inspection of system；
Step 5, open test low-tension supply simultaneously remove all interim trial lines.
Described method high-tension motor longitudinal differential protection checked with low pressure locked rotor current；The step 1 is also
Including
Step 1.1 is checked to high-tension motor longitudinal differential protection primary circuit, it is ensured that primary circuit connection is correct, rule
It is model, complete；
If step 1.2 synchronous motor, when locked rotor current is larger should also by Exciting Windings for Transverse Differential Protection Jing discharge resistance short circuit or
The starting resistance of 10 times of resistances of external 1 Exciting Windings for Transverse Differential Protection or so；
Described method high-tension motor longitudinal differential protection checked with low pressure locked rotor current；The step 4 is also
Including
Step 4.1, each phase differential protection in protective relay both sides is checked with size of current, the electric current of both sides homophase
Should be identical（Or be close to）, each phase current of asynchronous motor should balance；
Step 4.2, the current phase to flowing into protective relay are checked；
The electric current of motor both sides homophase should differ 180oOr 0o；
Step 4.3, difference current and stalling current to protective relay check,
Each phase differential current value of relay should be zero or close to zero, and each phase stalling current should be said with foundation relay
The value that bright book stalling current algorithm is calculated is consistent, and is much larger than difference current.If now difference current is incorrect, should have a power failure
After change any side（High-voltage board side or motor neutral point side）The secondary outgoing line polarity of 3 current transformers, until differential
Electric current and stalling current meet above-mentioned requirements.
As a result of above-mentioned technical scheme, the locked rotor current produced in the present invention runs well closer to motor
The revolution electric current produced under state, can to the wiring in first and second loop of whole longitudinal differential protection and polarity, relay it is main
Parameter setting etc. carries out the inspection of comprehensive and system, it can be ensured that safety when motor is run first.
Description of the drawings
Wiring schematic diagrams of the Fig. 1 for embodiment 1.
Specific embodiment
The present invention is further illustrated below by way of specific embodiment.
As shown in figure 1, certain high-voltage asynchronous motor, rated power 5000kW, rated voltage 10kV, using Siemens
7UM62 Comprehensive Protective Relays are protected；Wherein ,～U is three-phase low-voltage AC-testing supply;DL is the open circuit of test low pressure
Device;The wiring position of A, B, C for high-voltage board three-phase outlet current transformer front end experiment power supply;CTA, CTB, CTC are high-voltage board
Interior three-phase outlet current transformer, CTA0, CTB0, CTC0 are motor neutral point side threephase current transformer, and each s1, s2 are phase
Induced current transformer differential protection winding secondary outgoing line reference numerals;U1, U2 are motor stator U phase windings, and V1, V2 are electronic
Machine stator V phase windings, W1, W2 are motor stator W phase windings;IA1, IB1, IC1, IN1 indulge differential secondary for protective relay
The binding post of current loop side, IA2, IB2, IC2, IN2 indulge differential secondary current loop other side for protective relay
Binding post.
The locked rotor current for being produced using high-tension motor at lower voltages is come the inspection technique to motor longitudinal differential protection, bag
Include：
Step 1, high-tension motor longitudinal differential protection primary circuit is checked, it is ensured that longitudinal differential protection primary circuit connects
Connect correct, specification, complete；
Step 2, high-tension motor longitudinal differential protection secondary current circuit connection is checked；
Confirm protective relay longitudinal differential protection terminal IA1, IB1, IC1, IN1 wiring from the same side（High-voltage board side or
Motor neutral point side）Current transformer, current transformer of IA2, IB2, IC2, IN2 wiring from other side；Confirm
Transformer secondary differential protection winding of the transformer Secondary Winding of motor U phase windings both sides for CTA, CTA0, and terminal
Outlet accesses the corresponding A phases of protective relay and protects wiring position IA1, IN1, IA2, IN2；Confirm motor V phase windings both sides
Transformer Secondary Winding for CTB, CTB0 the secondary differential protection winding of transformer, and terminal outlet access protective relay
Corresponding B phases protect wiring position IB1, IN1, IB2, IN2；The transformer Secondary Winding for confirming motor W phase windings both sides is
The secondary differential protection winding of transformer of CTC, CTC0, and the corresponding C phases of terminal outlet access protective relay protect wiring
Position IC1, IN1, IC2, IN2；Confirm the vertical differential circuit of Current Transformer Secondary（Containing current transformer, protective relay）Do not open
Road, longitudinal differential protection secondary current loop have been grounded and have only been grounded at one；
Step 3, apply the low electricity of three-phase 380V in high-tension motor switch cabinet outlet side current transformer front-end A, B, location of C
Pressure, makes motor be in locked rotor condition；
Step 4, the longitudinal differential protection to high-tension motor carry out comprehensively, the inspection of system
Step 4.1, each phase current size in motor both sides to flowing into protective relay are checked, now by protection
Relay（Or use clamp on amperemeter）Check three-phase balance, motor locked rotor current is 70A, secondary loop current is
140mA, as 7UM62 is digital integrated protection relay, meets protection check needs；
Step 4.2, the current phase to flowing into protective relay are checked
Motor both sides in-phase current differs 180o（Directly read or obtain using between phase meter by protective relay
Take）；
Step 4.3, difference current and stalling current to protective relay are checked
Each phase differential current value of relay should be zero or close to zero, and each phase stalling current should be said with foundation relay
The value that bright book stalling current algorithm is calculated is consistent, and is much larger than difference current.Relay shows that each phase difference current is 0,
Each phase stalling current is 0.28A, and difference current and stalling current are correct.If now difference current is not zero and electric with braking
Stream is more or less the same, then any side should be changed after having a power failure（High-voltage board side or motor neutral point side）The difference of 3 current transformers
Dynamic protection winding secondary outgoing line polarity（S1, s2 outlet is exchanged）, then checked, until difference current and stalling current are accorded with
Close above-mentioned requirements.
Step 5, open test low-tension supply simultaneously remove all interim trial lines.
The revolution electric current that the locked rotor current produced in above-mentioned test is produced closer under motor normal operation, because
This can be carried out comprehensively to the major parameter of the wiring in first and second loop of whole longitudinal differential protection and polarity and relay setting etc.
And the inspection of system, it can be ensured that safety when motor is run first.
Claims (3)
1. a kind of method high-tension motor longitudinal differential protection checked with low pressure locked rotor current；It is characterized in that：It includes
Following step；
Step 1, high-tension motor primary circuit is checked；
Step 2, high-tension motor longitudinal differential protection secondary current circuit connection is checked, it is ensured that whole longitudinal differential protection is returned
Lu Zhong, the corresponding each corresponding relation in first and second side of motor both sides current transformer are correct, and Current Transformer Secondary is vertical poor
Dynamic loop is not opened a way, and longitudinal differential protection secondary current loop has been grounded and has only been grounded at one；
Step 3, high-tension motor switch cabinet outlet side current transformer front end apply three-phase alternating current low-voltage, make at motor
In natural locked rotor condition, and the electric current for meeting longitudinal differential protection inspection requirements is produced in differential secondary circuit is indulged；
Step 4, the longitudinal differential protection to high-tension motor carry out comprehensively, the inspection of system；
Step 5, open test low-tension supply simultaneously remove all interim trial lines.
2. method high-tension motor longitudinal differential protection checked with low pressure locked rotor current according to claim 1；
It is characterized in that：The step 1 also includes
Step 1.1 is checked to high-tension motor longitudinal differential protection primary circuit, it is ensured that primary circuit connection is correct, specification,
Completely；
If step 1.2 synchronous motor, should also will be Exciting Windings for Transverse Differential Protection Jing discharge resistance short-circuit or external when locked rotor current is larger
The starting resistance of 1 Exciting Windings for Transverse Differential Protection, 10 times of resistances or so.
3. method high-tension motor longitudinal differential protection checked with low pressure locked rotor current according to claim 1；
It is characterized in that：The step 4 also includes
Step 4.1, the electric current of both sides homophase answers phase to be checked with size of current to each phase differential protection in protective relay both sides
Same or close, each phase current of asynchronous motor should be balanced；
Step 4.2, the current phase to flowing into protective relay are checked；
The electric current of motor both sides homophase should differ 180oOr 0o；
Step 4.3, difference current and stalling current to protective relay check,
Each phase differential current value of relay should be zero or close to zero, and each phase stalling current should be with foundation relay specification
The value that stalling current algorithm is calculated is consistent, and is much larger than difference current, if now difference current is incorrect, after should having a power failure more
Change to meaning side, i.e. high-voltage board side or motor neutral point side 3 current transformers secondary outgoing line polarity, until differential electricity
Stream and stalling current meet the requirement of step 4.1 ~ 4.2.
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| CN201410487550.0A CN104267276B (en) | 2014-09-23 | 2014-09-23 | Method high-tension motor longitudinal differential protection checked with low pressure locked rotor current |
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| CN201410487550.0A CN104267276B (en) | 2014-09-23 | 2014-09-23 | Method high-tension motor longitudinal differential protection checked with low pressure locked rotor current |
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| CN104267276B true CN104267276B (en) | 2017-03-29 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107045116B (en) * | 2017-04-01 | 2021-05-11 | 云南电网有限责任公司 | Polarity detection method and device for current transformer for generator protection |
| CN107478943A (en) * | 2017-08-09 | 2017-12-15 | 大唐东北电力试验研究所有限公司 | Detect the method and device of differential protection for generator polarity |
| CN110554297A (en) * | 2018-06-04 | 2019-12-10 | 中冶天工集团有限公司 | method for checking differential protection current loop of large high-voltage motor by using low-voltage electricity |
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| CN1543033A (en) * | 2003-11-06 | 2004-11-03 | 北京四方继保自动化有限公司 | Far loopback testing technique for circuit longitudinal differential protection |
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| CN201274477Y (en) * | 2008-10-17 | 2009-07-15 | 武汉钢铁(集团)公司 | Detection apparatus for optical fiber longitudinal differential protection |
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| CN1543033A (en) * | 2003-11-06 | 2004-11-03 | 北京四方继保自动化有限公司 | Far loopback testing technique for circuit longitudinal differential protection |
| CN1753264A (en) * | 2005-10-26 | 2006-03-29 | 许继集团有限公司 | Double end testing method in power transmission line longitudinal difference protection |
| CN101179192A (en) * | 2007-11-30 | 2008-05-14 | 南京中德保护控制系统有限公司 | Channel monitoring method of high reliability circuit longitudinal differential protection |
| CN201274477Y (en) * | 2008-10-17 | 2009-07-15 | 武汉钢铁(集团)公司 | Detection apparatus for optical fiber longitudinal differential protection |
| CN102412569A (en) * | 2011-11-28 | 2012-04-11 | 北京四方继保自动化股份有限公司 | Method for starting longitudinal differential protection by using fault component |
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Address after: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Co-patentee after: MCC TIANGONG GROUP Corp.,Ltd. Patentee after: SHANGHAI ERSHIYE CONSTRUCTION Co.,Ltd. Address before: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Co-patentee before: MCC TIANGONG GROUP Corp.,Ltd. Patentee before: SHANGHAI MCC13 CONSTRUCTION Co.,Ltd. Address after: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Co-patentee after: MCC TIANGONG GROUP Corp.,Ltd. Patentee after: SHANGHAI MCC13 CONSTRUCTION Co.,Ltd. Address before: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Co-patentee before: MCC TIANGONG GROUP Corp.,Ltd. Patentee before: CMTCC Shanghai 13th Construction Co.,Ltd. |
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Effective date of registration: 20200508 Address after: 201999 room A, room 1325, Mudanjiang Road, Shanghai, Baoshan District, 403 Co-patentee after: CHINA MCC20 GROUP Corp.,Ltd. Patentee after: SHANGHAI ERSHIYE CONSTRUCTION Co.,Ltd. Address before: 201900 Shanghai city Baoshan District Tieli Road No. 2469 Co-patentee before: MCC TIANGONG GROUP Corp.,Ltd. Patentee before: SHANGHAI ERSHIYE CONSTRUCTION Co.,Ltd. |
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