CN104076249A - Three-phase three-winding transformer one-phase ground fault coverage diagnostic method - Google Patents
Three-phase three-winding transformer one-phase ground fault coverage diagnostic method Download PDFInfo
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- CN104076249A CN104076249A CN201410336710.1A CN201410336710A CN104076249A CN 104076249 A CN104076249 A CN 104076249A CN 201410336710 A CN201410336710 A CN 201410336710A CN 104076249 A CN104076249 A CN 104076249A
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Abstract
Disclosed is a three-phase three-winding transformer one-phase ground fault coverage diagnostic method. According to the method, zero sequence currents of a high-voltage side and a medium-voltage side of a three-phase three-winding transformer are measured, an area defined by a high-voltage side switch, a medium-voltage side switch and a low-voltage side switch of the transformer is regarded as a protection area, and if a one-phase ground short-circuit fault happens to a device in the protection area, the zero sequence currents of the high-voltage side and the medium-voltage side of the transformer are the same in phase; if the one-phase ground short-circuit fault happens to a device outside the protection area, the phases of the zero sequence currents of the high-voltage side and the medium-voltage side of the transformer differ by 180 degrees; the zero sequence currents of the high-voltage side and the medium-voltage side of the transformer are utilized for forming a three-phase three-winding transformer one-phase ground fault coverage diagnostic criterion. According to the method, in the calculation process, only the zero sequence currents of the high-voltage side and the medium-voltage side of the transformer are used, three-side three-phase total currents of the transformer are not required, and motion performance is not affected by an exciting current and a magnetizing rush current.
Description
Technical field
The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of three-phase three-winding transformer singlephase earth fault scope diagnostic method.
Background technology
The 220kV transformer of electric system widespread use adopts three-phase three-winding transformer conventionally.In order to guarantee that phase electromotive force is close to sine wave, for third harmonic provides path, three-phase three-winding transformer must have one group of winding to adopt delta connection, so its mode of connection is △/Y/Y wiring.
Current differential protection is the main protection of transformer, and difference between current momentum is zero when making normally to move, and two groups of Y side electric currents of transformer need be converted to △ side or △ side electric current is converted to two groups of Y sides, to eliminate out-of-balance current.In order to eliminate out-of-balance current; mainly adopt at present the current compensation mode that two groups of Y side electric currents is converted to the current compensation mode of △ side and △ side electric current is converted to two groups of Y sides; but the difference between current momentum after this two kinds of mapping modes conversion all can not correct response transformer magnetizing current impact; cause as the current differential protection Reliability of Microprocessor of transformer main protection influencedly, also make to utilize second harmonic to differentiate the method reliability of excitation surge current and short trouble on the low side.
Be subject to that current differential protection principle is circumscribed to be affected; current differential protection can only be by three-phase three-winding transformer as a protected integral body; can only distinguish trouble spot and whether be positioned at protection zone; and accurately failure judgement position is positioned at which side of three-phase three-winding transformer on earth; cannot provide fault coverage information accurately to fault judgement; after causing fault, difficulty is searched in trouble spot, is unfavorable for quick elimination of fault and the fast quick-recovery of power supply.
Summary of the invention
In order to realize the Accurate Diagnosis in three-phase three-winding transformer singlephase earth fault region; improve relay protection Reliability of Microprocessor, the three-phase three-winding transformer singlephase earth fault scope diagnostic method that the inventive method provides a kind of performance not affected by exciting current, excitation surge current, transition resistance and load current.
The present invention adopts following technical scheme:
Three-phase three-winding transformer singlephase earth fault scope diagnostic method, comprises following sequential steps:
(1) protective device difference measuring transformer high-pressure side zero-sequence current
, medium voltage side zero-sequence current
, wherein, h, m be indication transformer high-pressure side, transformer medium voltage side respectively;
(2) protective device judgement
whether set up, if set up, judge equipment single phase ground fault fault in the protection zone being surrounded by high voltage side of transformer switch, medium voltage side switch and low-side switch, protective device sends action trip signal, tripping transformer three side switches;
(3) protective device judgement
whether set up, if set up, judgement is positioned at the equipment single phase ground fault fault that high voltage side of transformer switch points to the equipment of high-voltage side bus direction or is positioned at transformer medium voltage side switch sensing medium voltage side generatrix direction.
The present invention compared with prior art, has following positive achievement:
The inventive method is measured the zero-sequence current of three-phase three-winding transformer high-pressure side and medium voltage side, the region being surrounded by high voltage side of transformer switch, transformer medium voltage side switch and step down side switch is considered as to protection zone, if equipment single phase ground fault fault in protection zone, high voltage side of transformer zero-sequence current and transformer medium voltage side zero-sequence current same-phase; If protection zone external equipment single phase ground fault fault, high voltage side of transformer zero-sequence current and 180 ° of transformer medium voltage side zero-sequence current phase phasic differences; Utilize high voltage side of transformer zero-sequence current and medium voltage side zero-sequence current to form three-phase three-winding transformer singlephase earth fault scope diagnosis criterion.In the inventive method computation process, only use high voltage side of transformer zero-sequence current and medium voltage side zero-sequence current, without using transformer three side three-phase total currents, performance is not subject to the impact of exciting current and excitation surge current.The inventive method utilizes high voltage side of transformer zero-sequence current and medium voltage side zero-sequence current to form three-phase three-winding transformer singlephase earth fault scope diagnosis criterion, and performance is not subject to the impact of load current and transition resistance.
Accompanying drawing explanation
Fig. 1 is △/Y/Y wiring transformer schematic diagram of application the inventive method.
Embodiment
According to Figure of description, technical scheme of the present invention is expressed in further detail below.
Fig. 1 is △/Y/Y wiring transformer schematic diagram of application the inventive method.In the present embodiment, protective device is measuring transformer high-pressure side zero-sequence current respectively
, medium voltage side zero-sequence current
, wherein, h, m be indication transformer high-pressure side, transformer medium voltage side respectively.
The region being surrounded by high voltage side of transformer switch, medium voltage side switch and low-side switch is considered as to protection zone, if equipment single phase ground fault fault in protection zone, high voltage side of transformer zero-sequence current and transformer medium voltage side zero-sequence current same-phase; If protection zone external equipment single phase ground fault fault, high voltage side of transformer zero-sequence current and 180 ° of transformer medium voltage side zero-sequence current phase phasic differences.Therefore, utilize high voltage side of transformer zero-sequence current and medium voltage side zero-sequence current to form three-phase three-winding transformer singlephase earth fault scope diagnosis criterion as follows:
1, protective device judgement
whether set up, if set up, judge equipment single phase ground fault fault in the protection zone being surrounded by high voltage side of transformer switch, medium voltage side switch and low-side switch, protective device sends action trip signal, tripping transformer three side switches.
2, protective device judgement
whether set up, if set up, judgement is positioned at the equipment single phase ground fault fault that high voltage side of transformer switch points to the equipment of high-voltage side bus direction or is positioned at transformer medium voltage side switch sensing medium voltage side generatrix direction.
In the inventive method computation process, only use high voltage side of transformer zero-sequence current and medium voltage side zero-sequence current, without using transformer three side three-phase total currents, performance is not subject to the impact of exciting current and excitation surge current.The inventive method utilizes high voltage side of transformer zero-sequence current and medium voltage side zero-sequence current to form three-phase three-winding transformer singlephase earth fault scope diagnosis criterion, and performance is not subject to the impact of load current and transition resistance.
It is same as the prior art that the present invention does not state part.
The foregoing is only preferred embodiment of the present invention; but protection scope of the present invention is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses, the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.
Claims (1)
1. three-phase three-winding transformer singlephase earth fault scope diagnostic method, is characterized in that, comprises following sequential steps:
(1) protective device difference measuring transformer high-pressure side zero-sequence current
, medium voltage side zero-sequence current
, wherein, h, m be indication transformer high-pressure side, transformer medium voltage side respectively;
(2) protective device judgement
whether set up, if set up, judge equipment single phase ground fault fault in the protection zone being surrounded by high voltage side of transformer switch, medium voltage side switch and low-side switch, protective device sends action trip signal, tripping transformer three side switches;
(3) protective device judgement
whether set up, if set up, judgement is positioned at the equipment single phase ground fault fault that high voltage side of transformer switch points to the equipment of high-voltage side bus direction or is positioned at transformer medium voltage side switch sensing medium voltage side generatrix direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410336710.1A CN104076249A (en) | 2014-07-15 | 2014-07-15 | Three-phase three-winding transformer one-phase ground fault coverage diagnostic method |
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| CN201410336710.1A CN104076249A (en) | 2014-07-15 | 2014-07-15 | Three-phase three-winding transformer one-phase ground fault coverage diagnostic method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990318A (en) * | 2017-06-07 | 2017-07-28 | 国网山西省电力公司电力科学研究院 | Three-phase three-winding transformer medium voltage side earth fault alerts method of discrimination and its device |
| CN111273194A (en) * | 2020-04-01 | 2020-06-12 | 李晓明 | Extraction method, line selection method and system for small current ground fault quantity of transformer |
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| CN101615784A (en) * | 2009-07-31 | 2009-12-30 | 西安交通大学 | Transmission line zero sequence longitudinal protection method based on the transformer neutral point zero-sequence current |
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| JP5020508B2 (en) * | 2005-12-07 | 2012-09-05 | 北陸電力株式会社 | Ground fault direction detector |
| JP2008241668A (en) * | 2007-03-29 | 2008-10-09 | Daihen Corp | Ground fault detector |
| JP2009247140A (en) * | 2008-03-31 | 2009-10-22 | Daihen Corp | Ground detecting apparatus |
| CN101615784A (en) * | 2009-07-31 | 2009-12-30 | 西安交通大学 | Transmission line zero sequence longitudinal protection method based on the transformer neutral point zero-sequence current |
| CN102508098A (en) * | 2011-10-31 | 2012-06-20 | 许继电气股份有限公司 | Quick distinguishing method for zero-sequence directional elements of alternating-current and direct-current serial-parallel power grid |
| CN102788934A (en) * | 2012-07-25 | 2012-11-21 | 深圳市普禄科智能检测设备有限公司 | Method and device for finding line ground fault point |
| CN102928739A (en) * | 2012-11-02 | 2013-02-13 | 华北电力大学（保定） | Method and system used for locating power grid single-phase ground faults and based on wireless sensor network |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106990318A (en) * | 2017-06-07 | 2017-07-28 | 国网山西省电力公司电力科学研究院 | Three-phase three-winding transformer medium voltage side earth fault alerts method of discrimination and its device |
| CN106990318B (en) * | 2017-06-07 | 2019-04-16 | 国网山西省电力公司电力科学研究院 | Three-phase three-winding transformer medium voltage side ground fault alerts method of discrimination and its device |
| CN111273194A (en) * | 2020-04-01 | 2020-06-12 | 李晓明 | Extraction method, line selection method and system for small current ground fault quantity of transformer |
| CN111273194B (en) * | 2020-04-01 | 2022-02-11 | 李晓明 | Extraction method, line selection method and system for small current ground fault quantity of transformer |
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| C06 | Publication | ||
| PB01 | Publication | ||
| ASS | Succession or assignment of patent right |
Owner name: STATE GRID FUJIAN ELECTRIC POWER CO., LTD. MAINTEN Free format text: FORMER OWNER: STATE GRID FUJIAN ELECTRIC POWER CO., LTD. MAINTENANCE BRANCH COMPANY OF STATE GRID FUJIAN ELECTRIC POWER COMPANY Effective date: 20140928 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Inventor after: Zeng Huimin Inventor after: Lin Fuhong Inventor before: Zeng Huimin |
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Free format text: CORRECT: INVENTOR; FROM: CENG HUIMIN TO: CENG HUIMIN LIN FUHONG |
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Effective date of registration: 20140928 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: State Grid Fujian Electric Power Co., Ltd. Applicant after: Maintenance branch company of State Grid Fujian Electric Power Co., Ltd. Applicant after: PUTIAN POWER SUPPLY COMPANY, STATE GRID FUJIAN ELECTRIC POWER CO., LTD. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: State Grid Fujian Electric Power Co., Ltd. Applicant before: Maintenance branch company of State Grid Fujian Electric Power Co., Ltd. |
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| RJ01 | Rejection of invention patent application after publication | ||
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Application publication date: 20141001 |