CN104716636B - The method for preventing distance protection III sections from making by overload mis-operation - Google Patents
The method for preventing distance protection III sections from making by overload mis-operation Download PDFInfo
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- CN104716636B CN104716636B CN201510105333.5A CN201510105333A CN104716636B CN 104716636 B CN104716636 B CN 104716636B CN 201510105333 A CN201510105333 A CN 201510105333A CN 104716636 B CN104716636 B CN 104716636B
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Abstract
The invention discloses a kind of method for preventing distance protection III sections from making by overload mis-operation; it is characterized in that; utilize the local information for protecting installation place to measure; by comparing overload and electric characteristic difference under failure two states, symmetrical overload and phase-to phase fault recognition methods and asymmetrical overload and singlephase earth fault recognition methods are proposed；Fault type is determined by fault recognition method, is combined with three sections of acting characteristic of distance protection, takes safeguard measure, realizes the method for preventing that distance protection III sections from making by overload mis-operation.This method is not influenceed by grounding resistance; various short troubles and overload can be identified; effectively prevent the distance protection caused by power flow transfer overload from malfunctioning, and the sensitivity of existing protection and the ability of resistance to transition resistance will not be reduced, can reliable open distance protection when being broken down in area.
Description
Technical field
The present invention relates to a kind of method for preventing distance protection III sections from making by overload mis-operation, belong to electric grid relay protection
Technical field.
Background technology
A lot of large area blackouts occur in the world in recent years, most of through analysis is due to that power flow transfer causes circuit
Distance protection malfunction during overload, caused by causing chain reaction.
The content of the invention
It is an object of the invention to overcome deficiency of the prior art, there is provided one kind prevents distance protection III sections because excessively negative
The method of lotus malfunction, this method do not influenceed by grounding resistance, can identify various short troubles and overload, effectively prevent because
Distance protection caused by power flow transfer overload malfunctions, and this method will not reduce the sensitivity of existing protection and resistance to transition
The ability of resistance, can reliable open distance protection when being broken down in area.
To reach above-mentioned purpose, the technical solution adopted in the present invention is：Prevent distance protection III sections because of overload mis-operation
The method of work, comprises the following steps：
Step 1：Using the local information for protecting installation place to measure, by comparing overload and electricity under failure two states
Gas feature difference, propose：Based on current asymmetry degree m andSymmetrical overload with it is alternate
Fault recognition method, and based on current asymmetry degree m,WithIt is not right
Claim overload and singlephase earth fault recognition methods；
Step 2：Fault type is determined by fault recognition method, is combined, adopts with three sections of acting characteristic of distance protection
Measure is fetched protection, realizes the method for preventing that distance protection III sections from making by overload mis-operation；
Wherein：M=(I0+I2)/I1, I0Represent zero-sequence current, I1Represent forward-order current, I2Represent negative-sequence current；UφφRepresent
Voltage between phases,Represent the vector of voltage between phases；Represent alternate load impedance angle；Represent line impedance angle；Uφ
Represent phase voltage,Represent phase voltage vector；Represent phase load impedance angle；φ=A, B, C.
Step 2 comprises the following steps that：
1) for m>When 0.7, it is determined as serious unbalanced fault, directly open all phase spacing III sections relays and connect
Ground distance III section relays；
2) when for 0.3≤m≤0.7, ifIt is set to phase-to phase fault, presses
Mutually open phase spacing III section relays；IfIt is set to singlephase earth fault, by phase
Open ground distance III section relays；If above-mentioned voltage conditions are all unsatisfactory for：Such as
For A phase high resistance earthing faults, then A phase ground distance III section relays are opened；Such asFor
B phase high resistance earthing faults, then open B phase ground distance III section relays；Such asFor C
Phase high resistance earthing fault, then open C phase ground distance III section relays；Wherein：UNNRepresent alternate rated voltage；UNRepresent single
Phase rated voltage；
3) for m<When 0.3, it is determined as symmetric fault or full phase overload, all ground distance III section relays of locking, this
Shi RuoBe determined as symmetric fault, open all phase spacing III sections after
Electrical equipment.
Compared with prior art, the beneficial effect that the present invention is reached：(1) local information is based on, independent of communication, easily
In realization；(2) overload and failure can be accurately distinguished, for any overload, distance protection is failure to actuate, effectively prevent because
Distance protection malfunction caused by power flow transfer overload, and during line fault, distance protection action message；(3) this method will not
The sensitivity of existing distance protection is reduced, and the resistance to transition resistance ability of distance protection greatly improved.
Brief description of the drawings
Fig. 1 is the flow chart of the inventive method.
Fig. 2 is the logic chart of AB phase distance protections III section false action-proof methods in the present invention.
Fig. 3 is the logic chart of A ground distance protections III section false action-proof methods in the present invention.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
As shown in figure 1, the method for preventing distance protection III sections from making by overload mis-operation, comprises the following steps：
Step 1：Using the local information for protecting installation place to measure, by comparing overload and electricity under failure two states
Gas feature difference, propose：Based on current asymmetry degree m,Symmetrical overload with it is alternate therefore
Hinder recognition methods, and based on current asymmetry degree m,WithAsymmetry
Overload and singlephase earth fault recognition methods；
Wherein：M=(I0+I2)/I1, I0Represent zero-sequence current, I1Represent forward-order current, I2Represent negative-sequence current；UφφRepresent
Voltage between phases,Represent the vector of voltage between phases；Represent alternate load impedance angle；Represent line impedance angle；Uφ
Represent phase voltage,Represent phase voltage vector；Represent phase load impedance angle；φ=A, B, C.
Calculate the break period in current asymmetry degree m, With
Step 2：Fault type is determined by fault recognition method, is combined, adopts with three sections of acting characteristic of distance protection
Measure is fetched protection, realizes the method for preventing that distance protection III sections from making by overload mis-operation, it is specific as follows：
1) judge whether to meet m>0.7, if m>0.7, it is determined as serious unbalanced fault, directly open all phase spacings
III sections relay and ground distance III section relays；Otherwise enter in next step；
2) judge whether to meet m >=0.3, if 0.3≤m≤0.7, carry out following procedure operation：
Pass throughAnd 0.5UNNRelation carry out phase-to phase fault recognizer, ifIt is set to phase-to phase fault, by phase spacing III section relays are mutually opened, has
Body is：IfThen open AB phase distance protection III sections, otherwise locking；
IfThen open BC phase distance protection III sections, otherwise locking；IfThen open CA phase distance protection III sections, otherwise locking；
Pass throughAnd 0.5UNRelation carry out earth fault recognizer, ifIt is set to singlephase earth fault, by ground distance III section relays are mutually opened, has
Body is：IfOrA phases ground distance is then opened to protect
Protect III sections, otherwise locking；IfOr Then open B
Phase ground distance protection III sections, otherwise locking；IfOr
Then open C phase ground distance protection III sections, otherwise locking.
It is above-mentioned：UNNRepresent alternate rated voltage；UNRepresent single-phase rated voltage.
3) for m<When 0.3, it is determined as symmetric fault or full phase overload, all ground distance III section relays of locking, this
Shi RuoIt is determined as symmetric fault, open all phase spacing III section relays
Device.
As shown in Fig. 2 it is the logic chart of the alternate false action-proof methods of AB；Fig. 3 is A phase ground distance false action-proof methods
Logic chart.△ t represent the action delay time in figure, and symbol " ＆ " represents and logical operation, symbol " >=1 " expression or logical operation.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, without departing from the technical principles of the invention, some improvement and deformation can also be made, these are improved and deformation
Also it should be regarded as protection scope of the present invention.
Claims (1)
1. the method for preventing distance protection III sections from making by overload mis-operation, it is characterised in that comprise the following steps：
Step 1：Using the local information for protecting installation place to measure, by comparing overload and electricity under phase-to phase fault two states
Gas feature difference, propose based on current asymmetry degree m andSymmetrical overload with it is alternate therefore
Hinder recognition methods,
By comparing electric characteristic difference under overload and singlephase earth fault two states, propose based on current asymmetry degree m,WithAsymmetrical overload and singlephase earth fault recognition methods；
Step 2：Fault type is determined by fault recognition method, is combined with three sections of acting characteristic of distance protection, takes guarantor
Shield measure, realize the method for preventing that distance protection III sections from making by overload mis-operation；
Wherein：M=(I0+I2)/I1, I0Represent zero-sequence current, I1Represent forward-order current, I2Represent negative-sequence current；UφφRepresent alternate
Voltage,Represent the vector of voltage between phases；Represent alternate load impedance angle；Represent line impedance angle；UφRepresent
Phase voltage,Represent phase voltage vector；Represent phase load impedance angle；φ=A, B, C；
Step 2 comprises the following steps that：
1) for m>When 0.7, it is determined as serious unbalanced fault, directly open all phase spacing III sections relays and ground connection away from
From III section relays；
2) when for 0.3≤m≤0.7, ifIt is set to phase-to phase fault, by mutually opening
Put phase spacing III section relays；IfIt is set to singlephase earth fault, by mutually opening
Put ground distance III section relays；If above-mentioned voltage conditions are all unsatisfactory for：Such as For A
Phase high resistance earthing fault, then open A phase ground distance III section relays；Such asFor B phases
High resistance earthing fault, then open B phase ground distance III section relays；Such asIt is high for C phases
Earth fault is hindered, then opens C phase ground distance III section relays；Wherein：UNNRepresent alternate rated voltage；UNRepresent single-phase volume
Determine voltage；
3) for m<When 0.3, it is determined as symmetric fault or full phase overload, all ground distance III section relays of locking, if nowIt is determined as symmetric fault, open all phase spacing III section relays.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917161B (en) * | 2015-06-18 | 2018-01-19 | 南京南瑞继保电气有限公司 | Adaptive distance protection method |
| CN105024366B (en) * | 2015-08-05 | 2018-06-29 | 华北电力大学（保定） | A kind of method that transmission line of electricity overload prevents III of Distance section protection misoperation |
| CN105140896B (en) * | 2015-09-26 | 2018-04-27 | 华北电力大学（保定） | A kind of relay protecting method for preventing large-area power-cuts |
| CN111157835B (en) * | 2018-11-07 | 2023-01-24 | 国网电力科学研究院武汉南瑞有限责任公司 | Power grid single-phase earth fault judgment method |
| CN110098600B (en) * | 2019-05-08 | 2021-02-26 | 天津大学 | Cable single-pole ground fault protection method based on line capacitance transferred charge |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710696A (en) * | 2009-12-03 | 2010-05-19 | 华中电网有限公司 | Method for solving line-protection false tripping when overloading |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7123459B2 (en) * | 2003-04-07 | 2006-10-17 | Schweitzer Engineering Laboratories, Inc. | Protective relay capable of protection applications without protection settings |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101710696A (en) * | 2009-12-03 | 2010-05-19 | 华中电网有限公司 | Method for solving line-protection false tripping when overloading |
Non-Patent Citations (3)
| Title |
|---|
| 基于过渡电阻有功功率的单相高阻接地保护;姜宪国等;《中国电机工程学报》;20130505;第33卷(第13期);第187-193页 * |
| 线路距离保护应对事故过负荷的策略;柳焕章等;《中国电机工程学报》;20110905;第31卷(第25期);第112-117页 * |
| 防止距离III段保护因过负荷误动的方法;徐岩等;《电力科学与工程》;20121031;第28卷(第10期);第22-27、32页 * |
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