CN104716636A - Method for protecting distance protection III section against malfunction caused by overload - Google Patents
Method for protecting distance protection III section against malfunction caused by overload Download PDFInfo
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- CN104716636A CN104716636A CN201510105333.5A CN201510105333A CN104716636A CN 104716636 A CN104716636 A CN 104716636A CN 201510105333 A CN201510105333 A CN 201510105333A CN 104716636 A CN104716636 A CN 104716636A
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Abstract
The invention discloses a method for protecting a distance protection III section against the malfunction caused by overloads. The method is characterized in that local information for protecting measurement at an installation position is utilized, and a symmetric overload and phase-to-phase fault identification method and an asymmetric overload and single-phase grounding fault identification method are provided by comparing electrical feature differences in an overload state and a fault state. The fault types are determined through the fault identification methods and are combined with operating characteristics of the distance protection III section, protection measures are taken, and the distance protection III section can be protected against the malfunction caused by the overloads through the method. The method is not affected by the grounding resistance, various short circuit faults and overloads can be identified, the distance protection malfunction caused by transferring of the overloads through power flow is effectively prevented, the sensitivity of current protection and the capability of resisting the transition resistance cannot be lowered, and distance protection is reliably conducted when faults happen in an area.
Description
Technical field
The present invention relates to a kind of method preventing distance protection III section from doing because of overload mis-operation, belong to electric grid relay protection technical field.
Background technology
In recent years a lot of large area blackout occurs in the world, major part is due to distance protection malfunction when power flow transfer causes circuit overload by analysis, thus causes chain reaction to cause.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art; a kind of method preventing distance protection III section from doing because of overload mis-operation is provided; the method is not by the impact of earth resistance; various short trouble and overload can be identified; effectively prevent the distance protection misoperation because power flow transfer overload causes; and the method can not reduce the sensitivity of existing protection and the ability of resistance to transition resistance, can reliable open distance protection when breaking down in district.
For achieving the above object, the technical solution adopted in the present invention is: the method preventing distance protection III section from doing because of overload mis-operation, comprises the steps:
Step one: utilize the local information that protection installation place is measured, by comparing electric characteristic difference under overload and fault two states, proposes: based on current asymmetry degree m with
symmetrical overload and phase-to phase fault recognition methods, and based on current asymmetry degree m,
with
asymmetrical overload and single phase ground fault recognition methods;
Step 2: by fault recognition method determination fault type, combines with the operating characteristics of distance protection three sections, takes safeguard measure, realizes the method preventing distance protection III section from doing because of overload mis-operation;
Wherein: m=(I
0+ I
2)/I
1, I
0represent zero-sequence current, I
1represent forward-order current, I
2represent negative-sequence current; U
φ φrepresent voltage between phases,
represent the vector of voltage between phases;
represent alternate load impedance angle;
represent line impedance angle; U
φrepresent phase voltage,
represent phase voltage vector;
represent phase load impedance angle; φ=A, B, C.
The concrete steps of step 2 are as follows:
1) time for m>0.7, be decided to be serious unbalanced fault, directly open all phase spacing III section relays and ground distance III section relay;
2) time for 0.3≤m≤0.7, if
be decided to be phase-to phase fault, by opening phase spacing III section relay mutually; If
be decided to be single phase ground fault, by opening ground distance III section relay mutually; If when above-mentioned voltage conditions does not meet: as
for A phase high resistance earthing fault, then open A phase ground distance III section relay; As
for B phase high resistance earthing fault, then open B phase ground distance III section relay; As
for C phase high resistance earthing fault, then open C phase ground distance III section relay; Wherein: U
nNrepresent alternate rated voltage; U
nrepresent single-phase rated voltage;
3), time for m<0.3, be decided to be symmetric fault or full phase overload, locking all ground distance III section relay, if now
be judged to be symmetric fault, open all phase spacing III section relays.
Compared with prior art, the beneficial effect that the present invention reaches: (1), based on local information, does not rely on communication, is easy to realize; (2) can accurately distinguish overload and fault, for any overload, distance protection is all failure to actuate, and effectively prevents the distance protection malfunction because power flow transfer overload causes, and during line fault, distance protection action message; (3) the method can not reduce the sensitivity of existing distance protection, and significantly improves the resistance to transition resistance ability of distance protection.
Accompanying drawing explanation
Fig. 1 is the flow chart of the inventive method.
Fig. 2 is the logic diagram of AB phase distance protection III section false action-proof method in the present invention.
Fig. 3 is the logic diagram of A ground distance protection III section false action-proof method in the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1, the method preventing distance protection III section from doing because of overload mis-operation, comprises the steps:
Step one: utilize the local information that protection installation place is measured, by comparing electric characteristic difference under overload and fault two states, proposition: based on current asymmetry degree m,
symmetrical overload and phase-to phase fault recognition methods, and based on current asymmetry degree m,
with
asymmetrical overload and single phase ground fault recognition methods;
Wherein: m=(I
0+ I
2)/I
1, I
0represent zero-sequence current, I
1represent forward-order current, I
2represent negative-sequence current; U
φ φrepresent voltage between phases,
represent the vector of voltage between phases;
represent alternate load impedance angle;
represent line impedance angle; U
φrepresent phase voltage,
represent phase voltage vector;
represent phase load impedance angle; φ=A, B, C.
Calculate the current asymmetry degree m in break period,
with
Step 2: by fault recognition method determination fault type, combines with the operating characteristics of distance protection three sections, takes safeguard measure, realizes the method preventing distance protection III section from doing because of overload mis-operation, specific as follows:
1) judge whether to meet m>0.7, if m>0.7, be decided to be serious unbalanced fault, directly open all phase spacing III section relays and ground distance III section relay; Otherwise enter next step;
2) judge whether to meet m >=0.3, if 0.3≤m≤0.7, then carry out following procedure operation:
Pass through
and 0.5U
nNrelation carry out phase-to phase fault recognizer, if
being decided to be phase-to phase fault, by opening phase spacing III section relay mutually, being specially: if
then open AB phase distance protection III section, otherwise locking; If
then open BC phase distance protection III section, otherwise locking; If
then open CA phase distance protection III section, otherwise locking;
Pass through
and 0.5U
nrelation carry out earth fault recognizer, if
being decided to be single phase ground fault, by opening ground distance III section relay mutually, being specially: if
or
then open A phase ground distance protection III section, otherwise locking; If
or
then open B phase ground distance protection III section, otherwise locking; If
or
then open C phase ground distance protection III section, otherwise locking.
Above-mentioned: U
nNrepresent alternate rated voltage; U
nrepresent single-phase rated voltage.
3), time for m<0.3, be decided to be symmetric fault or full phase overload, locking all ground distance III section relay, if now
be judged to be symmetric fault, open all phase spacing III section relays.
As shown in Figure 2, be the logic diagram of the alternate false action-proof method of AB; Fig. 3 is the logic diagram of A phase ground distance false action-proof method.In figure, △ t represents the action delay time, and symbol " & " represents and logical operation, and symbol " >=1 " represents or logical operation.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (2)
1. the method preventing distance protection III section from doing because of overload mis-operation, is characterized in that, comprise the steps:
Step one: utilize the local information that protection installation place is measured, by comparing electric characteristic difference under overload and fault two states, proposes: based on current asymmetry degree m with
symmetrical overload and phase-to phase fault recognition methods, and based on current asymmetry degree m,
with
asymmetrical overload and single phase ground fault recognition methods;
Step 2: by fault recognition method determination fault type, combines with the operating characteristics of distance protection three sections, takes safeguard measure, realizes the method preventing distance protection III section from doing because of overload mis-operation;
Wherein: m=(I
0+ I
2)/I
1, I
0represent zero-sequence current, I
1represent forward-order current, I
2represent negative-sequence current; U
φ φrepresent voltage between phases,
represent the vector of voltage between phases;
represent alternate load impedance angle;
represent line impedance angle; U
φrepresent phase voltage,
represent phase voltage vector;
represent phase load impedance angle; φ=A, B, C.
2. the method preventing distance protection III section from doing because of overload mis-operation according to claim 1, it is characterized in that, the concrete steps of step 2 are as follows:
1) time for m>0.7, be decided to be serious unbalanced fault, directly open all phase spacing III section relays and ground distance III section relay;
2) time for 0.3≤m≤0.7, if
be decided to be phase-to phase fault, by opening phase spacing III section relay mutually; If
be decided to be single phase ground fault, by opening ground distance III section relay mutually; If when above-mentioned voltage conditions does not meet: as
for A phase high resistance earthing fault, then open A phase ground distance III section relay; As
for B phase high resistance earthing fault, then open B phase ground distance III section relay; As
for C phase high resistance earthing fault, then open C phase ground distance III section relay; Wherein: U
nNrepresent alternate rated voltage; U
nrepresent single-phase rated voltage;
3), time for m<0.3, be decided to be symmetric fault or full phase overload, locking all ground distance III section relay, if now
be judged to be symmetric fault, open all phase spacing III section relays.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510105333.5A CN104716636B (en) | 2015-03-11 | 2015-03-11 | The method for preventing distance protection III sections from making by overload mis-operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510105333.5A CN104716636B (en) | 2015-03-11 | 2015-03-11 | The method for preventing distance protection III sections from making by overload mis-operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104716636A true CN104716636A (en) | 2015-06-17 |
| CN104716636B CN104716636B (en) | 2018-02-13 |
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ID=53415710
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917161A (en) * | 2015-06-18 | 2015-09-16 | 南京南瑞继保电气有限公司 | Self-adaptive distance protection method |
| CN105024366A (en) * | 2015-08-05 | 2015-11-04 | 华北电力大学（保定） | Method for preventing false operation of distance III-section protection when power transmission line is overloaded |
| CN105140896A (en) * | 2015-09-26 | 2015-12-09 | 华北电力大学（保定） | Relay protection method capable of preventing power failure in large area |
| CN110098600A (en) * | 2019-05-08 | 2019-08-06 | 天津大学 | A kind of cable monopolar grounding fault guard method based on line capacitance transfer charge |
| CN111157835A (en) * | 2018-11-07 | 2020-05-15 | 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 |
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| US20040196603A1 (en) * | 2003-04-07 | 2004-10-07 | Schweitzer Edmund O. | Protective relay capable of protection applications without protection settings |
| 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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| US20040196603A1 (en) * | 2003-04-07 | 2004-10-07 | Schweitzer Edmund O. | Protective relay capable of protection applications without protection settings |
| 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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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917161A (en) * | 2015-06-18 | 2015-09-16 | 南京南瑞继保电气有限公司 | Self-adaptive distance protection method |
| CN104917161B (en) * | 2015-06-18 | 2018-01-19 | 南京南瑞继保电气有限公司 | Adaptive distance protection method |
| CN105024366A (en) * | 2015-08-05 | 2015-11-04 | 华北电力大学（保定） | Method for preventing false operation of distance III-section protection when power transmission line is overloaded |
| 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 |
| CN105140896A (en) * | 2015-09-26 | 2015-12-09 | 华北电力大学（保定） | Relay protection method capable of preventing power failure in large area |
| 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 |
| CN111157835A (en) * | 2018-11-07 | 2020-05-15 | 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 |
| CN110098600A (en) * | 2019-05-08 | 2019-08-06 | 天津大学 | A kind of cable monopolar grounding fault guard method based on line capacitance transfer charge |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104716636B (en) | 2018-02-13 |
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