CN104092186A - Thee-phase three-winding transformer fault relay protection method based on sudden changes of positive sequence currents - Google Patents

Thee-phase three-winding transformer fault relay protection method based on sudden changes of positive sequence currents Download PDF

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Publication number
CN104092186A
CN104092186A CN201410336708.4A CN201410336708A CN104092186A CN 104092186 A CN104092186 A CN 104092186A CN 201410336708 A CN201410336708 A CN 201410336708A CN 104092186 A CN104092186 A CN 104092186A
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voltage side
transformer
phase
positive sequence
judgement
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CN104092186B (en
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曾惠敏
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Maintenance Branch of State Grid Fujian Electric Power Co Ltd
Putian Power Supply Co of State Grid Fujian Electric Power Co Ltd
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State Grid Corp of China SGCC
State Grid Fujian Electric Power Co Ltd
Maintenance Branch of State Grid Fujian Electric Power Co Ltd
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Abstract

The invention discloses a thee-phase three-winding transformer fault relay protection method based on sudden changes of positive sequence currents. Firstly, the sudden changes of the positive sequence currents on the high-voltage side, the medium-voltage side and the low-voltage side of a thee-phase three-winding transformer are measured, and the vector of the sudden change of the positive sequence current on the high-voltage side and the vector of the sudden change of the positive sequence current on the medium-voltage side are rotated 30 degrees counterclockwise respectively; secondly, a fault region of the thee-phase three-winding transformer is distinguished accurately according to the phase relation between the sudden change of the positive sequence current on the high-voltage side after counterclockwise rotation by 30 degrees, the sudden change of the positive sequence current on the medium-voltage side after counterclockwise rotation by 30 degrees and the sudden change of the positive sequence current on the low-voltage side. In the computing process, only the sudden changes of the positive sequence currents on the high-voltage side, the medium-voltage side and the low-voltage side of the transformer are utilized, there is no need to utilize thee-phase total currents on the three sides of the transformer, and motion performance is not affected by exciting currents or excitation inrush currents.

Description

Based on forward-order current Sudden Changing Rate three-phase three-winding transformer fault relay protecting method
Technical field
The present invention relates to Relay Protection Technology in Power System field, specifically relate to a kind of based on forward-order current Sudden Changing Rate three-phase three-winding transformer fault relay protecting method.
Background technology
The 220kV transformer of electric power system extensive use adopts three-phase three-winding transformer conventionally.In order to guarantee that phase electromotive force is close to sine wave, for triple-frequency harmonics 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 unsymmetrical current.In order to eliminate unsymmetrical 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 magnetizing inrush 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 fault point 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 fault point, 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 of three-phase three-winding transformer fault zone; improve relaying protection Reliability of Microprocessor, the inventive method provide that a kind of performance is not subject to that exciting current, magnetizing inrush current, transition resistance and load current affect based on forward-order current Sudden Changing Rate three-phase three-winding transformer fault relay protecting method.The present invention adopts following technical scheme:
Based on forward-order current Sudden Changing Rate three-phase three-winding transformer fault relay protecting method, comprise following sequential steps:
(1) protective device difference measuring transformer high-pressure side φ phase forward-order current Sudden Changing Rate medium voltage side φ phase forward-order current Sudden Changing Rate low-pressure side φ phase forward-order current Sudden Changing Rate wherein, φ=A, B, C phase; H, m, l be indication transformer high-pressure side, transformer medium voltage side, step down side respectively;
(2) protective device judgement with with whether set up simultaneously, if set up simultaneously, judge in the protection zone being surrounded by high voltage side of transformer switch, transformer medium voltage side switch and step down side switch the equipment fault that is short-circuited, protective device sends action trip signal, tripping transformer three side switches;
(3) protective device judgement with with whether set up, if set up simultaneously, judgement is positioned at equipment that high voltage side of transformer switch the points to high-voltage side bus direction fault that is short-circuited simultaneously;
(4) protective device judgement with with whether set up, if set up simultaneously, judgement is positioned at equipment that transformer medium voltage side switch the points to medium voltage side generatrix direction fault that is short-circuited simultaneously;
(5) protective device judgement with with whether set up, if set up simultaneously, judgement is positioned at equipment that step down side switch the points to low-pressure side bus direction fault that is short-circuited simultaneously.
The present invention compared with prior art, has following positive achievement:
First the inventive method measures the forward-order current Sudden Changing Rate of three-phase three-winding transformer high-pressure side, medium voltage side and low-pressure side, the vector of the vector sum medium voltage side forward-order current Sudden Changing Rate of high-pressure side forward-order current Sudden Changing Rate is rotated counterclockwise respectively to 30 °, then utilizes the high-pressure side forward-order current Sudden Changing Rate be rotated counterclockwise after 30 °, be rotated counterclockwise the fault zone that medium voltage side forward-order current Sudden Changing Rate after 30 ° and the phase relation between low-pressure side forward-order current Sudden Changing Rate are accurately differentiated three-phase three-winding transformer.In the inventive method computational process, only use the forward-order current Sudden Changing Rate of high voltage side of transformer, medium voltage side and low-pressure side, without using transformer three side three-phase total currents, performance is not subject to the impact of exciting current and magnetizing inrush current.The inventive method utilization is rotated counterclockwise high-pressure side forward-order current Sudden Changing Rate after 30 °, be rotated counterclockwise the fault zone that medium voltage side forward-order current Sudden Changing Rate after 30 ° and the phase relation between low-pressure side forward-order current Sudden Changing Rate are accurately differentiated three-phase three-winding transformer, 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 φ phase forward-order current Sudden Changing Rate respectively medium voltage side φ phase forward-order current Sudden Changing Rate low-pressure side φ phase forward-order current Sudden Changing Rate wherein, φ=A, B, C phase; H, m, l be indication transformer high-pressure side, transformer medium voltage side, step down side respectively.
Protective device judgement with with whether set up simultaneously, if set up simultaneously, judge in the protection zone being surrounded by high voltage side of transformer switch, transformer medium voltage side switch and step down side switch the equipment fault that is short-circuited, protective device sends action trip signal, tripping transformer three side switches;
Protective device judgement with with whether set up, if set up simultaneously, judgement is positioned at equipment that high voltage side of transformer switch the points to high-voltage side bus direction fault that is short-circuited simultaneously;
Protective device judgement with with whether set up, if set up simultaneously, judgement is positioned at equipment that transformer medium voltage side switch the points to medium voltage side generatrix direction fault that is short-circuited simultaneously;
Protective device judgement with with whether set up, if set up simultaneously, judgement is positioned at equipment that step down side switch the points to low-pressure side bus direction fault that is short-circuited simultaneously.
In the inventive method computational process, only use the forward-order current Sudden Changing Rate of high voltage side of transformer, medium voltage side and low-pressure side, without using transformer three side three-phase total currents, performance is not subject to the impact of exciting current and magnetizing inrush current.The inventive method utilization is rotated counterclockwise high-pressure side forward-order current Sudden Changing Rate after 30 °, be rotated counterclockwise the fault zone that medium voltage side forward-order current Sudden Changing Rate after 30 ° and the phase relation between low-pressure side forward-order current Sudden Changing Rate are accurately differentiated three-phase three-winding transformer, 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. based on forward-order current Sudden Changing Rate three-phase three-winding transformer fault relay protecting method, it is characterized in that, comprise following sequential steps:
(1) protective device difference measuring transformer high-pressure side φ phase forward-order current Sudden Changing Rate medium voltage side φ phase forward-order current Sudden Changing Rate low-pressure side φ phase negative-sequence current wherein, φ=A, B, C phase; H, m, l be indication transformer high-pressure side, transformer medium voltage side, step down side respectively;
(2) protective device judgement with with whether set up simultaneously, if set up simultaneously, judge in the protection zone being surrounded by high voltage side of transformer switch, transformer medium voltage side switch and step down side switch the equipment fault that is short-circuited, protective device sends action trip signal, tripping transformer three side switches;
(3) protective device judgement with with whether set up, if set up simultaneously, judgement is positioned at equipment that high voltage side of transformer switch the points to high-voltage side bus direction fault that is short-circuited simultaneously;
(4) protective device judgement with with whether set up, if set up simultaneously, judgement is positioned at equipment that transformer medium voltage side switch the points to medium voltage side generatrix direction fault that is short-circuited simultaneously;
(5) protective device judgement with with whether set up, if set up simultaneously, judgement is positioned at equipment that step down side switch the points to low-pressure side bus direction fault that is short-circuited simultaneously.
CN201410336708.4A 2014-07-15 2014-07-15 Thee-phase three-winding transformer fault relay protection method based on sudden changes of positive sequence currents Active CN104092186B (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105162090A (en) * 2015-07-15 2015-12-16 南京国电南自电网自动化有限公司 Graded controllable high-voltage parallel reactor protecting method
CN106786376A (en) * 2016-11-22 2017-05-31 国网江苏省电力公司镇江供电公司 The negative phase-sequence clockwise compensation method counterclockwise of transformer differential protection high-pressure side positive sequence
CN106814282A (en) * 2015-11-27 2017-06-09 中国电力科学研究院 A kind of double-circuit line on same pole phase-selecting method
CN111244894A (en) * 2020-01-19 2020-06-05 南方电网科学研究院有限责任公司 Protection method and device for transformer winding turn-to-turn short circuit and storage medium

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1725590A (en) * 2005-06-28 2006-01-25 山东大学 Step down transformer and relay protection method of middle low voltage side bus
CN101764392A (en) * 2010-01-11 2010-06-30 山东大学 Multi-lateral current magnitude voltage magnitude based transformer relay protecting method
CN103762554A (en) * 2014-02-18 2014-04-30 国家电网公司 Fault detecting method for side windings of three-phase three-winding transformer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1725590A (en) * 2005-06-28 2006-01-25 山东大学 Step down transformer and relay protection method of middle low voltage side bus
CN101764392A (en) * 2010-01-11 2010-06-30 山东大学 Multi-lateral current magnitude voltage magnitude based transformer relay protecting method
CN103762554A (en) * 2014-02-18 2014-04-30 国家电网公司 Fault detecting method for side windings of three-phase three-winding transformer

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105162090A (en) * 2015-07-15 2015-12-16 南京国电南自电网自动化有限公司 Graded controllable high-voltage parallel reactor protecting method
CN105162090B (en) * 2015-07-15 2017-09-15 南京国电南自电网自动化有限公司 It is classified controllable high-voltage shunt reactor guard method
CN106814282A (en) * 2015-11-27 2017-06-09 中国电力科学研究院 A kind of double-circuit line on same pole phase-selecting method
CN106814282B (en) * 2015-11-27 2020-01-17 中国电力科学研究院 Phase selection method for double circuit lines on same pole
CN106786376A (en) * 2016-11-22 2017-05-31 国网江苏省电力公司镇江供电公司 The negative phase-sequence clockwise compensation method counterclockwise of transformer differential protection high-pressure side positive sequence
CN111244894A (en) * 2020-01-19 2020-06-05 南方电网科学研究院有限责任公司 Protection method and device for transformer winding turn-to-turn short circuit and storage medium
CN111244894B (en) * 2020-01-19 2021-05-14 南方电网科学研究院有限责任公司 Protection method and device for transformer winding turn-to-turn short circuit and storage medium

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