CN202206121U - Protective device for 500KV/10KV station-use transformer - Google Patents
Protective device for 500KV/10KV station-use transformer Download PDFInfo
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- CN202206121U CN202206121U CN 201120308305 CN201120308305U CN202206121U CN 202206121 U CN202206121 U CN 202206121U CN 201120308305 CN201120308305 CN 201120308305 CN 201120308305 U CN201120308305 U CN 201120308305U CN 202206121 U CN202206121 U CN 202206121U
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- 230000001681 protective effect Effects 0.000 title claims abstract description 29
- 230000007935 neutral effect Effects 0.000 claims description 7
- 229920006395 saturated elastomer Polymers 0.000 abstract description 4
- 230000009466 transformation Effects 0.000 abstract description 3
- 238000004804 winding Methods 0.000 abstract description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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- 230000001131 transforming effect Effects 0.000 description 1
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Abstract
The utility model belongs to the transformer field. Disclosed is a protective device for a 500KV/10KV station-use transformer. The ratio of transformation of the station-use transformer differential protection current transformer is a secondary winding of a current transformer of 150/1A. By choosing proper ratio of transformation of the current transformer, the differential protection of the station-use transformer will not generate mis-moving while the maximum crossing short circuit crosses, with the current transformer of 150/1A being unsaturated. A test proves that the maximum current at the low-voltage side is 25KA while the maximum current at the high voltage side is 500 A amid short circuit. The configuration of the current transformer can meet the requirements. When an internal fault occurs, the fault current is so heavy that the current transformer at the high voltage side might be saturated, thereby generating current difference which belongs to the in-area fault and causing not influence upon the correct motion of the protective device. Moreover, the protection scopes of the station-use transformer protection and the 500KV bus protection mutually overlap and avoid dead zone.
Description
Technical field
The utility model belongs to field transformer, relates in particular to a kind of 500kV/10kV station and uses protection equipment for transformer.
Background technology
Standing in the prior art, short circuit current level is very high with transformer high-voltage side rated operational current is minimum, and protective current transformer, is difficult for selecting, and protects the difficulty of adjusting.Uses transformer to be example with 500kV/10kV station, on high-tension side short circuit current level is very high, can reach 63kA, in order to ensure the reliably working of current transformer, when distinguishing inner high voltage side failed because, is unlikely to cause seriously saturated, and no-load voltage ratio can not obtain too little.But because the 500kV station is less relatively with transformer capacity, generally be merely 40MVA, so the high-pressure side rated current is very little, be about 46A, actual day-to-day operation electric current is littler, is merely 0.8 ~ 5.8A, and 10kV side rated current is 2300A, and running current is 40 ~ 288A.In order to guarantee in the district when minor failure occurring; Turn-to-turn fault particularly appears and differential protection ability action message when transition grounding through resistance fault; Thereby the no-load voltage ratio of current transformer can not be selected too greatly again; Because too big primary current can cause current transformer normally to move the time reduces, thereby directly influence exchanges the sampling precision of protective device and the processing of differential both sides coefficient of balance.Therefore, protective current transformer, has been chosen to a great problem of station with protection equipment for transformer.
The utility model content
To the technical problem that the protective current transformer, that exists in the prior art is difficult to select, therefore be necessary to provide a kind of 500kV/10kV station to use protection equipment for transformer, select appropriate protective current transformer, to solve the problems referred to above.A kind of 500kV/10kV of the utility model uses protection equipment for transformer in the station; Comprise bus, breaker protection current transformer, transformer differential protection current transformer, high-voltage side bus protective current instrument transformer, stand with transformer, neutral point protection current transformer, low-pressure side bus protective current instrument transformer, said bus, breaker protection current transformer, transformer differential protection current transformer, high-voltage side bus protective current instrument transformer, standing connects with transformer, low-pressure side bus protective current instrument transformer in regular turn; Neutral point protection current transformer ground connection is passed through with transformer in said station; Said bus is 500kV, and the no-load voltage ratio that said transformer differential protection current transformer is is 150/1A.
Preferably, the no-load voltage ratio of above-mentioned high-voltage side bus protective current instrument transformer is 4000/1A.
Preferably, above-mentioned station is shared with transformer overcurrent protection current transformer and high-voltage side bus protective current instrument transformer, and its no-load voltage ratio is 4000/1A.
The beneficial effect of the utility model is: through selecting the no-load voltage ratio of suitable current instrument transformer; Stand with transformer differential protection through maximum pass through short circuit current the time not malfunction; The current transformer of 150/1A is unsaturated, and through test, the maximum short circuit current during the low-pressure side short circuit is 25kA; On high-tension side electric current is 500A, and this current transformer configuration meets the demands.When internal fault, fault current is excessive, may cause the high voltage side current instrument transformer saturated, causes poor stream, and belong to troubles inside the sample space this moment, can not influence the correct operation of protective device.The station crosses one another with tranformer protection and 500kV bus protection protection range simultaneously, guarantees no dead band.
Description of drawings
Fig. 1 is that the protection equipment for transformer sketch map is used at the 500kV/10kV station of the utility model.
Embodiment
Specify embodiment of the present invention below in conjunction with Figure of description.
By the regulation of " relaying protection and automatic safety device technical regulation ", every station is with becoming configuration 2 cover electric quantity protective and 1 cover non electrical quantity protection.For strengthening main protection, stand and adopt dualization configuration with becoming the longitudinal differential main protection, with the current differential core, the zero sequence differential protection is for auxiliary.According to the principle of simplifying backup protection, backup protection is mainly as the reserve of transformer main protection, the reserve of double as transformer external area error.To the step-down transformer of 500/10kV single-side power power supply, consider that the protection of 500kV side bus all is dualization, stand and do not consider to match with the system protection of 500kV with becoming protection.Simultaneously concerning Y/ △ pattern transformer; Impedance component can not be protected step down side winding internal short-circuit; So impedance protection is not considered with uprising to press the rear flank to be equipped with and protect in the station, overexcitation protection, current quick only are set, press overcurrent protection, overload protection again.The protection of multiple piezoelectricity stream was established in backup protection for low-pressure side, then can be used as the nearly reserve of 10kV bus and the reserve far away of 10kV feeder line.Reserve ground protection, high-pressure side be provided with the zero sequence overcurrent and with the neutral point overcurrent protection, low-pressure side is established zero-sequence voltage protection.
Being chosen to protective current transformer, stood with a great problem of protection equipment for transformer.The utility model discloses a kind of 500kV/10kV station and use protection equipment for transformer; The protection equipment for transformer sketch map is used at the 500kV/10kV station of the utility model as shown in Figure 1; Comprise bus 1, breaker protection current transformer 2, transformer differential protection current transformer 3, high-voltage side bus protective current instrument transformer 4, stand with transformer 5, neutral point protection current transformer 6, low-pressure side bus protective current instrument transformer 7, said bus 1, breaker protection current transformer 2, transformer differential protection current transformer 3, high-voltage side bus protective current instrument transformer 4, standing connects with transformer 5, low-pressure side bus protective current instrument transformer 7 in regular turn; Neutral point protection current transformer 6 ground connection are passed through with transformer 5 in said station; Said bus is 500kV, and the no-load voltage ratio that said transformer differential protection current transformer 3 is is 150/1A.This station with the transformer bus differential protection through maximum pass through short circuit current the time not malfunction; The current transformer of 150/1A is unsaturated, and through test, the maximum short circuit current during the low-pressure side short circuit is 25kA; On high-tension side electric current is 500A, and this current transformer configuration meets the demands.When internal fault, fault current is excessive, may cause the high voltage side current instrument transformer saturated, causes poor stream, and belong to troubles inside the sample space this moment, can not influence the correct operation of protective device.
Preferably, the no-load voltage ratio of said high-voltage side bus protective current instrument transformer 4 is 4000/1A, and each branch current mutual inductor ratio of bus protection current transformer and bus protection is consistent, and in the time of can guaranteeing in 500kV bus zone failed because, current transformer is unsaturated.Standing crosses one another with tranformer protection and 500kV bus protection protection range, guarantees no dead band.
Preferably, said station is shared with the current transformer of transformer overcurrent protection current transformer and high-voltage side bus differential protection, and its no-load voltage ratio is 4000/1A.Stand and adopt the III section with becoming the high-pressure side overcurrent protection.The I-II section adopts the little transformation ratio current transformer of 150/1A, can be through composite voltage locking and direction locking; The III section adopts the current mutual inductor with high transforming ratio of 4000/1A, and as the quick-break section, the starting definite value is fixed as 95% of action definite value.
The utility model is not limited to aforesaid embodiment.The utility model can expand to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (3)
1. protection equipment for transformer is used at a 500kV/10kV station; It is characterized in that comprising bus, breaker protection current transformer, transformer differential protection current transformer, high-voltage side bus protective current instrument transformer, stand with transformer, neutral point protection current transformer, low-pressure side bus protective current instrument transformer, said bus, breaker protection current transformer, transformer differential protection current transformer, high-voltage side bus protective current instrument transformer, standing connects with transformer, low-pressure side bus protective current instrument transformer in regular turn; Neutral point protection current transformer ground connection is passed through with transformer in said station; Said bus is 500kV, and the no-load voltage ratio that said transformer differential protection current transformer is is 150/1A.
2. 500kV/10kV as claimed in claim 1 uses protection equipment for transformer in the station, and the no-load voltage ratio that it is characterized in that high-voltage side bus protective current instrument transformer is 4000/1A.
3. 500kV/10kV as claimed in claim 2 uses protection equipment for transformer in the station, it is characterized in that said station is shared with transformer overcurrent protection current transformer and high-voltage side bus protective current instrument transformer, and its no-load voltage ratio is 4000/1A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120308305 CN202206121U (en) | 2011-08-23 | 2011-08-23 | Protective device for 500KV/10KV station-use transformer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120308305 CN202206121U (en) | 2011-08-23 | 2011-08-23 | Protective device for 500KV/10KV station-use transformer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202206121U true CN202206121U (en) | 2012-04-25 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120308305 Expired - Lifetime CN202206121U (en) | 2011-08-23 | 2011-08-23 | Protective device for 500KV/10KV station-use transformer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202206121U (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346535A (en) * | 2013-06-20 | 2013-10-09 | 国家电网公司 | Doubling differential protection method for converter transformer |
| CN103730879A (en) * | 2013-11-22 | 2014-04-16 | 国家电网公司 | Protection device for power utilization system of transformer substation |
| CN106033882A (en) * | 2015-03-18 | 2016-10-19 | 中国电力工程顾问集团华北电力设计院有限公司 | Novel microcomputer integration and protection device |
| CN106371049A (en) * | 2016-08-31 | 2017-02-01 | 贵州电网有限责任公司贵阳供电局 | Current transformer secondary open circuit identification method |
| CN108414874A (en) * | 2018-03-09 | 2018-08-17 | 中铁十局集团电务工程有限公司 | Differential protection circuit method of calibration, device and equipment |
-
2011
- 2011-08-23 CN CN 201120308305 patent/CN202206121U/en not_active Expired - Lifetime
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103346535A (en) * | 2013-06-20 | 2013-10-09 | 国家电网公司 | Doubling differential protection method for converter transformer |
| CN103346535B (en) * | 2013-06-20 | 2017-08-22 | 国家电网公司 | A kind of doubling differential protection method for converter transformer |
| CN103730879A (en) * | 2013-11-22 | 2014-04-16 | 国家电网公司 | Protection device for power utilization system of transformer substation |
| CN103730879B (en) * | 2013-11-22 | 2017-01-04 | 国家电网公司 | A kind of protection device of Substation Station electricity system |
| CN106033882A (en) * | 2015-03-18 | 2016-10-19 | 中国电力工程顾问集团华北电力设计院有限公司 | Novel microcomputer integration and protection device |
| CN106033882B (en) * | 2015-03-18 | 2018-10-02 | 中国电力工程顾问集团华北电力设计院有限公司 | Novel microcomputer complex protection device |
| CN106371049A (en) * | 2016-08-31 | 2017-02-01 | 贵州电网有限责任公司贵阳供电局 | Current transformer secondary open circuit identification method |
| CN106371049B (en) * | 2016-08-31 | 2023-09-26 | 贵州电网有限责任公司贵阳供电局 | Current transformer secondary open circuit identification method |
| CN108414874A (en) * | 2018-03-09 | 2018-08-17 | 中铁十局集团电务工程有限公司 | Differential protection circuit method of calibration, device and equipment |
| CN108414874B (en) * | 2018-03-09 | 2021-12-28 | 中铁十一局集团电务工程有限公司 | Differential protection circuit verification method, device and equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: CHINA POWER ENGINEERING CONSULTING GROUP CORPORATI Free format text: FORMER OWNER: CHINA POWER ENGINEERING CONSULTING GROUP CORPORATION HUABEI POWER DESIGN INST., CHINA POWER ENGINEERING CONSULTING GROUP CENTRAL SOUTHERN CHINA ELECTRIC POWER DESIGN INSTITUTE, CHINA POWER ENGINEERING CONSULTING GROUP COR NORTHWEST ELECTRIC POWER DESIGN INSTITUTE, CHINA POWER ENGINEERING CONSULTING GROUP CORPORATION Effective date: 20141222 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20141222 Address after: 610021 No. 18 Dongfeng Road, Sichuan, Chengdu Patentee after: Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation Patentee after: China Power Engineering Consulting Group Corporation Patentee after: Huabei Power Design Inst., China Power Engineering Consulting Group Patentee after: Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group Cor Patentee after: Northwest Electric Power Design Institute, China Power Engineering Consulting Group Corporation Patentee after: ELECTRIC POWER PLANNING & ENGINEERING INSTITUTE Address before: 610021 No. 18 Dongfeng Road, Sichuan, Chengdu Patentee before: Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation Patentee before: China Power Engineering Consulting Group Corporation Patentee before: Huabei Power Design Inst., China Power Engineering Consulting Group Patentee before: Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group Cor Patentee before: Northwest Electric Power Design Institute, China Power Engineering Consulting Group Corporation |
|
| C56 | Change in the name or address of the patentee |
Owner name: CHINA POWER ENGINEERING CONSULTING GROUP SOUTHWEST Free format text: FORMER NAME: SOUTHWEST ELECTRIC POWER DESIGN INSTITUTE OF CHINA POWER ENGINEERING CONSULTING GROUP CORPORATION |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 610021 No. 18 Dongfeng Road, Sichuan, Chengdu Patentee after: China Power Engineering Consulting Group Southwest Electric Power Design Institute Co., Ltd. Patentee after: CHINA POWER ENGINEERING CONSULTING (GROUP) CORPORATION Patentee after: Co., Ltd of Huabei Power Design Inst., China Power Engineering Consulting Group Patentee after: Co., Ltd of Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group Corporation Patentee after: NORTHWEST ELECTRIC POWER DESIGN INSTITUTE CO., LTD. OF CHINA POWER ENGINEERING CONSULTING GROUP Patentee after: ELECTRIC POWER PLANNING & ENGINEERING INSTITUTE Address before: 610021 No. 18 Dongfeng Road, Sichuan, Chengdu Patentee before: Southwest Electric Power Design Institute of China Power Engineering Consulting Group Corporation Patentee before: China Power Engineering Consulting Group Corporation Patentee before: Huabei Power Design Inst., China Power Engineering Consulting Group Patentee before: Central Southern China Electric Power Design Institute, China Power Engineering Consulting Group Cor Patentee before: Northwest Electric Power Design Institute, China Power Engineering Consulting Group Corporation Patentee before: ELECTRIC POWER PLANNING & ENGINEERING INSTITUTE |
|
| CX01 | Expiry of patent term |
Granted publication date: 20120425 |
|
| CX01 | Expiry of patent term |