CN100350709C - Positive and zero sequence fault component braking method for preventing transformer protection from malfunction - Google Patents
Positive and zero sequence fault component braking method for preventing transformer protection from malfunction Download PDFInfo
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- CN100350709C CN100350709C CNB2004100847743A CN200410084774A CN100350709C CN 100350709 C CN100350709 C CN 100350709C CN B2004100847743 A CNB2004100847743 A CN B2004100847743A CN 200410084774 A CN200410084774 A CN 200410084774A CN 100350709 C CN100350709 C CN 100350709C
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Abstract
The present invention discloses a positive sequence and zero sequence fault component braking method for preventing the malfunction of protection for transformers; ratio braking elements are composed of the positive sequence electric current fault components of a fundamental wave at the Y0 side of a transformer and the zero sequence electric current fault components of the fundamental wave at the Y0 side. When a ratio value is smaller than a definite value, a braking signal is output to stop the differential protection for transformer ratios. The application of the proposal only collects the three-phase electric current at the Y0 side with a power supply, and uses the positive sequence electric current fault components of the fundamental wave at the Y0 side of the transformer and the zero sequence electric current fault components of the fundamental wave at the Y0 side to form the ratio braking elements. The method of the present invention can thoroughly avoid the malfunction of differential protection for transformers caused by an external grounding fault at the Y0 side when the errors of a three-phase electric current transformer are not consistent, and can prevent the malfunction of differential protection for transformers caused by the zero sequence electric current resulting in differential unbalance electric currents under the condition of other non-internal faults.
Description
Technical field
The present invention relates to a kind of relay protection method of power system, particularly a kind of positive sequence and zero-sequence fault component braking method that prevents malfunction for tranformer protection.
Background technology
Existing power transformer differential protection device by the ratio brake element, promptly by the ratio of differential current and through current, is discerned external area error and troubles inside the sample space; Simultaneously,, promptly, discern magnetizing inrush current and overexcitation electric current, reach the purpose of differentiating internal fault by analyzing the waveform or the harmonic content of differential current by shoving and the overexcitation braking member.To Y
0The power transformer of/Δ wiring is for preventing Y
0Lateral areas external ground fault zero-sequence current causes differential protection malfunction, extensively adopts Y at present
0The side three-phase current carries out the method for conversion, eliminates the influence of zero-sequence current.But work as Y
0Side threephase current transformer error is inconsistent, and transformer is only at the Y that external area error takes place
0When side has power supply, can not eliminate Y by conventional method
0The influence of the zero-sequence current that lateral areas external ground fault causes; bigger differential unsymmetrical current will be had; the ratio brake element, shove and the overexcitation braking member can not reliably be braked this; especially very little even be under zero the situation at the transformer load electric current; ratio brake element, the braking member that shoves can not be braked this; as long as error current surpasses threshold, transformer differential protection is with malfunction.In number of patent application is 2,004,100,163 6.2 " preventing the comprehensive poor stream method of transformer differential protection malfunction ", recently differentiate Y by differential current and zero-sequence current
0The method of lateral areas external ground fault can overcome above-mentioned defective, but differential current is gathered complexity.
Summary of the invention
The technical problem to be solved in the present invention is the Y that exists in the existing transformer differential protection technology
0Side three-phase current transform method can not be eliminated the influence of zero-sequence current fully, and a kind of positive sequence and zero-sequence fault component braking method that prevents malfunction for tranformer protection is provided, and uses transformer Y
0The fundamental positive sequence current failure component of side and this side group ripple zero-sequence current fault component component ratio braking member, when rate value during less than setting value, output three-phase brake signal is braked the transformer ratio differential protection.Advantage of the present invention is, relies on one-sided three-phase current, uses transformer Y
0The fundamental positive sequence current failure component of side and the braking of this side group ripple zero-sequence current fault component component ratio, in the time of can avoiding the threephase current transformer error inconsistent fully, Y
0The transformer differential protection malfunction that lateral areas external ground fault causes.
A kind of positive sequence and zero-sequence fault component braking method that prevents malfunction for tranformer protection is characterized in that: use transformer Y
0The fundamental positive sequence current failure component of side and this side group ripple zero-sequence current fault component component ratio braking member are worked as Y
0During less than setting value, brake the transformer ratio differential protection by output three-phase brake signal divided by the rate value of this side group ripple zero-sequence current fault component for the fundamental positive sequence current failure component of side; The foundation of positive sequence and zero-sequence fault component braking is:
Δ3I
+/Δ3I
0?＜K
Δ 3I in the formula
+Be transformer Y
0The fundamental positive sequence current failure component of side, Δ 3I
0Be Y
0Side group ripple zero-sequence current fault component, K is a setting value, 0＜K＜1.
With prior art relatively, the invention has the beneficial effects as follows to have proposed first in traditional transformer differential protection, set up and use transformer Y
0The fundamental positive sequence current failure component and the Y of side
0Side group ripple zero-sequence current fault component component ratio braking member, when rate value during less than setting value, output three-phase brake signal is braked the transformer ratio differential protection, prevents the transformer differential protection malfunction.Use this programme, only need to gather the Y that power supply is arranged
0Side three-phase current and this side zero-sequence current, with fundamental positive sequence current failure component and the braking of fundamental wave zero sequence current failure component component ratio, in the time of just can avoiding the threephase current transformer error inconsistent fully, Y
0The transformer differential protection malfunction that lateral areas external ground fault causes also can prevent under other non-internal fault situations the transformer differential protection misoperation that the differential unsymmetrical current that zero-sequence current causes causes.
Description of drawings
Fig. 1 is for realizing a kind of positive sequence of malfunction for tranformer protection and circuit block diagram of zero-sequence fault component braking element of preventing of the present invention.
Embodiment
Embodiment 1:
A kind of positive sequence and zero-sequence fault component braking method that prevents malfunction for tranformer protection, this method can be achieved by a kind of positive sequence of malfunction for tranformer protection and circuit block diagram of zero-sequence fault component braking element of preventing of Fig. 1.This element is made of memory 11～14, subtracter 21～24, fundamental positive sequence pass filter 1, filter 2,01, multiplier 3 and comparator 4, wherein the positive input terminal of the input of memory 11～13 and subtracter 21～23 difference input transformer Y
0The three-phase current instantaneous value signal i of side
a, i
b, i
cThe output of memory 11～13 connects the negative input end of subtracter 21～23 respectively, and the output of subtracter 21～23 is connected with three inputs of fundamental positive sequence pass filter 1 respectively; The input of the output termination filter 2 of fundamental positive sequence pass filter 1, the output of filter 2 is connected with the positive input terminal of comparator 4; The positive input terminal of the input of memory 14 and subtracter 24 is input transformer Y respectively
0Side zero-sequence current instantaneous value signal 3i
o, the negative input end of the output termination subtracter 24 of memory 14, the output of subtracter 24 is connected with the input of filter 01, an input of the output termination multiplier 3 of filter 01; Another input input setting value K=0.9 of multiplier 3, the negative input end of its output termination comparator 4; The output output three-phase brake signal of comparator 4.Positive input terminal signal in comparator is less than the negative input end signal, and comparator output three-phase brake signal is braked the transformer ratio differential protection, prevents the transformer differential protection malfunction.Use this programme, only need to gather the Y that power supply is arranged
0The three-phase current of side is used transformer Y
0The fundamental positive sequence current failure component and the Y of side
0Side group ripple zero-sequence current fault component component ratio braking member, in the time of just can avoiding the threephase current transformer error inconsistent fully, Y
0The transformer differential protection malfunction that lateral areas external ground fault causes also can prevent under other non-internal fault situations the transformer differential protection misoperation that the differential unsymmetrical current that zero-sequence current causes causes.
Claims (2)
1. a positive sequence and a zero-sequence fault component braking method that prevents malfunction for tranformer protection is characterized in that: use transformer Y
0The fundamental positive sequence current failure component of side and this side group ripple zero-sequence current fault component component ratio braking member are worked as Y
0During less than setting value, brake the transformer ratio differential protection by output three-phase brake signal divided by the rate value of this side group ripple zero-sequence current fault component for the fundamental positive sequence current failure component of side; The foundation of positive sequence and zero-sequence fault component braking is:
Δ3I+/Δ3I
0 ＜K
Δ 3I in the formula
+Be transformer Y
0The fundamental positive sequence current failure component of side, Δ 3I
0Be Y
0Side group ripple zero-sequence current fault component, K is a setting value.
2. method according to claim 1 is characterized in that: setting value K is 0＜K＜1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100847743A CN100350709C (en) | 2004-12-02 | 2004-12-02 | Positive and zero sequence fault component braking method for preventing transformer protection from malfunction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100847743A CN100350709C (en) | 2004-12-02 | 2004-12-02 | Positive and zero sequence fault component braking method for preventing transformer protection from malfunction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1614850A CN1614850A (en) | 2005-05-11 |
| CN100350709C true CN100350709C (en) | 2007-11-21 |
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ID=34765982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100847743A Expired - Fee Related CN100350709C (en) | 2004-12-02 | 2004-12-02 | Positive and zero sequence fault component braking method for preventing transformer protection from malfunction |
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| CN (1) | CN100350709C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158151B (en) * | 2013-10-08 | 2017-07-18 | 广东电网公司电力科学研究院 | Prevent the braking circuit and method of malfunction for tranformer protection |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402400A (en) * | 2002-08-26 | 2003-03-12 | 南京南瑞继保电气有限公司 | Variable slope differential ratio protection method |
| CN1419327A (en) * | 2002-10-24 | 2003-05-21 | 南京南瑞继保电气有限公司 | Generator industrial-frequency variation equantity rate difference protection method |
-
2004
- 2004-12-02 CN CNB2004100847743A patent/CN100350709C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402400A (en) * | 2002-08-26 | 2003-03-12 | 南京南瑞继保电气有限公司 | Variable slope differential ratio protection method |
| CN1419327A (en) * | 2002-10-24 | 2003-05-21 | 南京南瑞继保电气有限公司 | Generator industrial-frequency variation equantity rate difference protection method |
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| Publication number | Publication date |
|---|---|
| CN1614850A (en) | 2005-05-11 |
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Granted publication date: 20071121 Termination date: 20101202 |