CN104362735B - A kind of method reducing power plant's power failure range - Google Patents
A kind of method reducing power plant's power failure range Download PDFInfo
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- CN104362735B CN104362735B CN201410621085.5A CN201410621085A CN104362735B CN 104362735 B CN104362735 B CN 104362735B CN 201410621085 A CN201410621085 A CN 201410621085A CN 104362735 B CN104362735 B CN 104362735B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P80/00—Climate change mitigation technologies for sector-wide applications
- Y02P80/10—Efficient use of energy, e.g. using compressed air or pressurized fluid as energy carrier
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- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a kind of method reducing power plant's power failure range; comprise the following steps: earth fault range subdivision; work house transformer branch ground protection operating space is divided into three parts, respectively HV Auxiliary Transformer low-pressure side winding, the enclosed busbar of HV Auxiliary Transformer low-pressure side winding to station-service work incoming line switch cabinet and HV auxiliary power bus；G-T protective transfer portion, cancels branch's ground protection action locking station service fast cutting system action outlet, and other action outlet keeps constant；Work incoming line switch cabinet comprehensive protector transfer portion, the zero-sequence voltage injection action of interpolation integrated protection is exported to fast switching device locking station service and cuts soon.The present invention is without investing new procuring equipment, it is only necessary to designed by simple technique and secondary circuit transformation, under Transformer Winding and enclosed busbar failure condition, Controlling Auxiliaries in Power Plants is avoided having a power failure suddenly, effectively reduce power failure range, reduce unnecessary loss, increase economic efficiency.
Description
Technical field
The present invention relates to a kind of method reducing power plant's power failure range.
Background technology
The safe and reliable power supply of power plant auxiliary system is the primary condition of generating set safe operation, and it is fast that power plant all installs station service
Cutting apparatus.
Power plant HV auxiliary power s ystem cuts logic soon, and under normal condition, HV auxiliary power s ystem is cut standby unit transformer by the house transformer that works
Depressor, reserve station service transformer cut makees house transformer；Under failure condition, generatortransformer unit (hereinafter referred to as transformer unit)
Protection act outlet starts the fast cutting system of station service, and high-voltage Auxiliary electric load is switched to standby factory by the unit transformer that works by fast cutting system
Use transformator.When working the ground protection action of house transformer branch, the fast cutting system action of protection exit locking station-service, station-service
6kV (10kV) working bus bar system dead electricity.Due to station-service high voltage bus system blackout, cause certain economic loss.
Summary of the invention
The present invention is to solve the problems referred to above, it is proposed that a kind of method reducing power plant's power failure range, this method is thin by protection domain
Point, ability locking auxiliary Power switching during only 6kV working bus bar generation earth fault, work house transformer winding and high-voltage Auxiliary
When winding is to work incoming line switch cabinet enclosed busbar generation earth fault, not locking auxiliary Power switching.
To achieve these goals, the present invention adopts the following technical scheme that
A kind of method reducing power plant's power failure range, comprises the following steps:
(1) earth fault range subdivision, is divided into three parts by work house transformer branch ground protection operating space, respectively
Closing for HV Auxiliary Transformer low-pressure side winding, HV Auxiliary Transformer low-pressure side winding to station-service work incoming line switch cabinet is female
Line and HV auxiliary power bus；
(2) G-T protective transfer portion, cancels branch's ground protection action locking station service fast cutting system action outlet, its
Its action outlet keeps constant；Work incoming line switch cabinet comprehensive protector transfer portion, the zero sequence direction adding integrated protection is protected
Protect action to be exported to fast switching device locking station service and cut soon.
In described step (1), in order to reduce power failure range, only need to be to locking auxiliary Power switching during station-service working bus bar earth fault
Action, therefore, the region that earth fault occurs, with work service entrance switch as separation, is divided into work service entrance switch to high pressure factory
By transformer portion and HV auxiliary power bus part.
In described step (1), work service entrance switch to HV Auxiliary Transformer part includes high-voltage Auxiliary low pressure side winding and height
Pressure house transformer low-pressure side winding is to station-service work incoming line switch cabinet enclosed busbar.
In described step (2), first ensure that work incoming line switch cabinet comprehensive protector has self-produced zero-sequence current and differentiates zero simultaneously
The element in sequence direction, it is then determined that protection definite value, sets up a cable from switch comprehensive protector to station-service fast switching device,
Locking station service is cut soon.
The operation principle of the present invention is: Working transformer low-pressure side branch ground protection uses step down side neutral point zero sequence CT,
Fault coverage include Working transformer low-pressure side winding, transformator to the enclosed busbar of work service entrance switch, 6kV working bus bar,
But, during only 6kV bus generation earth fault, need locking station service to cut soon.Occur in Transformer Winding or enclosed busbar
Earth fault, and the no ground fault of 6kV bus, then can be switched to spare transformer by station service.
The invention have the benefit that
(1) generating set protection and the fast cutting system of station-service of random capacity it are applicable to；
(2) without investing new procuring equipment, it is only necessary to designed by simple technique and secondary circuit transformation, in Transformer Winding and envelope
In the case of closing bus-bar fault, station service is cut according to failover logic action soon, and Controlling Auxiliaries in Power Plants is avoided having a power failure suddenly, effectively reduces
Power failure range, reduces unnecessary loss, increases economic efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention.
Wherein, 1, work house transformer low-pressure side A branch winding generation ground short circuit；2, work house transformer is to work
The enclosed busbar generation earth fault of service entrance switch；3, station-service 6kV A section working bus bar generation earth fault.
Detailed description of the invention:
The invention will be further described below in conjunction with the accompanying drawings.
Transformation situation: the locking interface of cancellation G-T protective to the fast cutting system of station service, increases work incoming line switch cabinet and combines guarantor extremely
The locking interface of the fast cutting system of station service, adjusts and combines the definite value protecting ground protection.Protection to this technological transformation verifies, mould
Intending protection act, belt switch carries out protecting transmission, and result of the test meets invention requirement.
Action situation: as it is shown in figure 1, when Working transformer low-pressure side A branch's winding generation ground short circuit (such as 1 in Fig. 1),
Low-pressure side star winding neutral conductor CT Secondary Winding current break, the ground protection action of G-T protective branch, protection exit is jumped
Opening 1A2 work service entrance switch, export to station service simultaneously and cut locking switching soon, the standby service entrance switch of locking 1A1 closes a floodgate, station-service
6kV A section bus dead electricity；In like manner, at 2,3 in earth fault occurs such as Fig. 1, result will also result in 6kV A section bus
Dead electricity.If after transforming according to the inventive method, earth fault occurs in such as Fig. 11,2, and transformer unit ground connection is protected
Protect action jump 1A2 work service entrance switch and do not send out locking station service and cut instruction soon, combine and protect ground protection (criterion: zero sequence direction)
Not operating, the fast cutting system of station service, according to cutting logic soon, starts and cuts soon, the standby service entrance switch of the 1A1 that closes, 6kV A section bus
Power supply is normal, does not causes station service dead electricity because of earth fault, it is ensured that station-service subsidiary engine is properly functioning.
Although the detailed description of the invention of the present invention is described by the above-mentioned accompanying drawing that combines, but not limit to scope
System, one of ordinary skill in the art should be understood that on the basis of technical scheme, and those skilled in the art need not pay
Go out various amendments or deformation that creative work can make still within protection scope of the present invention.
Claims (3)
1. the method reducing power plant's power failure range, is characterized in that: comprise the following steps:
(1) earth fault range subdivision, is divided into work house transformer branch ground protection operating space
Three parts, respectively HV Auxiliary Transformer low-pressure side winding, HV Auxiliary Transformer low-pressure side winding are to station-service
The enclosed busbar of work incoming line switch cabinet and HV auxiliary power bus；
(2) G-T protective transfer portion, cancels branch's ground protection action fast cutting system of locking station service
Action exports, and other action outlet keeps constant；Work incoming line switch cabinet comprehensive protector transfer portion, adds
Add the zero-sequence voltage injection action of integrated protection to be exported to fast switching device locking station service and cut soon；
In described step (2), first ensure that work incoming line switch cabinet comprehensive protector has self-produced zero sequence electricity
Stream differentiates the element of zero sequence direction simultaneously, it is then determined that protection definite value, sets up one from switch comprehensive protector
To the cable of station-service fast switching device, locking station service is cut soon.
A kind of method reducing power plant's power failure range, is characterized in that: described step
Suddenly in (1), in order to reduce power failure range, only need to be to locking station-service TURP during station-service working bus bar earth fault
Move work, and therefore, the region that earth fault occurs, with work service entrance switch as separation, is divided into work inlet wire
Switch is to HV Auxiliary Transformer part and HV auxiliary power bus part.
A kind of method reducing power plant's power failure range, is characterized in that: described step
Suddenly in (1), work service entrance switch to HV Auxiliary Transformer part include high-voltage Auxiliary low pressure side winding and
HV Auxiliary Transformer low-pressure side winding is to station-service work incoming line switch cabinet enclosed busbar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410621085.5A CN104362735B (en) | 2014-11-06 | 2014-11-06 | A kind of method reducing power plant's power failure range |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410621085.5A CN104362735B (en) | 2014-11-06 | 2014-11-06 | A kind of method reducing power plant's power failure range |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104362735A CN104362735A (en) | 2015-02-18 |
| CN104362735B true CN104362735B (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410621085.5A Expired - Fee Related CN104362735B (en) | 2014-11-06 | 2014-11-06 | A kind of method reducing power plant's power failure range |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111463756B (en) * | 2020-05-07 | 2022-04-22 | 华电电力科学研究院有限公司 | Protection locking joint optimization method based on high-service bus protection and fast switching device |
| CN112087048B (en) * | 2020-09-07 | 2022-06-14 | 西安热工研究院有限公司 | High-voltage plant branch zero-sequence protection configuration system and method |
| CN112202238B (en) * | 2020-09-28 | 2023-03-14 | 西安热工研究院有限公司 | Automatic resetting method and system for factory power supply fast switching device |
| CN112332384B (en) * | 2020-10-26 | 2022-11-01 | 西安热工研究院有限公司 | Method for preventing power station service system from losing power by mistake |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201789272U (en) * | 2010-04-30 | 2011-04-06 | 金华电业局 | Relay protection circuit preventing transformer differential protection malfunction |
| CN103117532B (en) * | 2013-02-28 | 2015-04-22 | 龙滩水电开发有限公司 | Zero-sequence voltage trip protection method for low-voltage side of transformers |
| CN103401225B (en) * | 2013-08-07 | 2016-03-02 | 攀钢集团西昌钢钒有限公司 | Ground connection hold concurrently house transformer overcurrent protection setting method and connection jump method to set up |
| CN203827060U (en) * | 2014-05-15 | 2014-09-10 | 大唐韩城第二发电有限责任公司 | Electrical protection system for power plant |
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| CN104362735A (en) | 2015-02-18 |
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