CN1614848A - Positive sequence and zero sequence braking method for preventing transformer protection from malfunction - Google Patents
Positive sequence and zero sequence braking method for preventing transformer protection from malfunction Download PDFInfo
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- CN1614848A CN1614848A CN 200410084761 CN200410084761A CN1614848A CN 1614848 A CN1614848 A CN 1614848A CN 200410084761 CN200410084761 CN 200410084761 CN 200410084761 A CN200410084761 A CN 200410084761A CN 1614848 A CN1614848 A CN 1614848A
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- sequence
- transformer
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- positive sequence
- current
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Abstract
The positive sequence current of first harmonic at Y0 side of transformer and the zero sequence current at the same side are used to build the rate break component. When the rate value is less than setting value, the break signal is outputted to break the rate differential protection of relating transformer. The invention can avoid miss -protection caused by ground fault of Y0 side when error of three-phase current transformer is disagreeing.
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 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 20041001636.2 " 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 braking method that prevents malfunction for tranformer protection is provided, and uses transformer Y
0The fundamental positive sequence electric current of side and this side group ripple zero-sequence current component ratio braking member, when rate value during less than setting value, the output 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 electric current of side and this side group ripple zero-sequence current component ratio braking member, 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 braking method that prevents malfunction for tranformer protection is characterized in that: use transformer Y
0The fundamental positive sequence electric current of side and fundamental wave zero sequence electric current component ratio braking member, when rate value during less than setting value, the output brake signal is braked the transformer ratio differential protection;
The foundation of positive sequence and zero-sequence braking is:
3I
+/3I
0＜K
3I in the formula
+, 3I
0Be respectively transformer Y
0The fundamental positive sequence electric current of side and the fundamental wave zero sequence electric current of this side, setting value K is 0＜K＜1.
With prior art relatively, the invention has the beneficial effects as follows to have proposed first in traditional transformer differential protection, add a kind of transformer Y that uses
0The method of the fundamental positive sequence electric current of side and fundamental wave zero sequence electric current component ratio braking member, when rate value during less than setting value, output three-phase brake signal is braked the transformer ratio differential protection.Use this programme, only need to gather the Y that power supply is arranged
0The three-phase current of side, with the fundamental positive sequence electric current and the fundamental wave zero sequence electric current component ratio braking member of this side, 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
Below in conjunction with accompanying drawing to the specific embodiment of the present invention further detailed description.
Fig. 1 is for realizing a kind of positive sequence of malfunction for tranformer protection and circuit block diagram of zero-sequence braking element of preventing of the present invention.
Embodiment
Embodiment 1:
A kind of positive sequence and zero-sequence braking method that prevents the transformer differential protection malfunction, this method can be achieved by a kind of positive sequence of malfunction for tranformer protection and circuit of zero-sequence braking element of preventing of Fig. 1.This element is made of fundamental positive sequence pass filter 1, filter 2,01, multiplier 3 and comparator 4, wherein three of fundamental positive sequence pass filter 1 input difference input transformer Y
0The three-phase current instantaneous value signal i of side
a, i
b, i
c, the input of its output termination filter 2; The input input transformer Y of filter 01
0The zero-sequence current instantaneous value signal 3i of side
o, an input of its output termination multiplier 3, another input input setting value K=0.9 of multiplier 3, its output is connected with the negative input end of comparator 4; The output of the positive input termination filter 2 of comparator 4, its output output three-phase brake signal.Positive input terminal signal in comparator is less than the negative input end signal, and comparator exports 0, and declaring has district's external ground fault, and output three-phase brake signal is braked the transformer ratio differential protection, prevents the transformer differential protection malfunction; Otherwise comparator output 1 allows the differential protection action.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 electric current of side and fundamental wave zero sequence electric current 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 braking method that prevents malfunction for tranformer protection is characterized in that: use transformer Y
0The fundamental positive sequence electric current of side and fundamental wave zero sequence electric current component ratio braking member, when rate value during less than setting value, the output brake signal is braked the transformer ratio differential protection; The foundation of positive sequence and zero-sequence braking is:
3I
+/3I
0＜K
(3I in the formula
+), (3I
0) be respectively transformer Y
0The fundamental positive sequence electric current of side and the fundamental wave zero sequence electric current of this side (K) are setting value.
2. a kind of positive sequence and zero-sequence braking method that prevents malfunction for tranformer protection according to claim 1, it is characterized in that: setting value (K) is 0＜K＜1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100847616A CN100388582C (en) | 2004-12-02 | 2004-12-02 | Positive sequence and zero sequence braking method for preventing transformer protection from malfunction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100847616A CN100388582C (en) | 2004-12-02 | 2004-12-02 | Positive sequence and zero sequence braking method for preventing transformer protection from malfunction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1614848A true CN1614848A (en) | 2005-05-11 |
| CN100388582C CN100388582C (en) | 2008-05-14 |
Family
ID=34765975
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100847616A Expired - Fee Related CN100388582C (en) | 2004-12-02 | 2004-12-02 | Positive sequence and zero sequence braking method for preventing transformer protection from malfunction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100388582C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158151A (en) * | 2013-10-08 | 2014-11-19 | 广东电网公司电力科学研究院 | Brake circuit and method for preventing transformer protection from malfunction |
| CN105071346A (en) * | 2015-08-27 | 2015-11-18 | 南京国电南自电网自动化有限公司 | Positive-sequence current cross brake method for preventing transformer homodyne protection misoperation |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2714771B1 (en) * | 1994-01-06 | 1996-02-02 | Merlin Gerin | Differential protection device for a power transformer. |
| US6356421B1 (en) * | 1999-11-29 | 2002-03-12 | Schweitzer Engineering Labs., Inc. | System for power transformer differential protection |
| CN100424955C (en) * | 2002-08-26 | 2008-10-08 | 南京南瑞继保电气有限公司 | Variable slope differential ratio protection method |
-
2004
- 2004-12-02 CN CNB2004100847616A patent/CN100388582C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104158151A (en) * | 2013-10-08 | 2014-11-19 | 广东电网公司电力科学研究院 | Brake circuit and method for preventing transformer protection from malfunction |
| 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 |
| CN105071346A (en) * | 2015-08-27 | 2015-11-18 | 南京国电南自电网自动化有限公司 | Positive-sequence current cross brake method for preventing transformer homodyne protection misoperation |
| CN105071346B (en) * | 2015-08-27 | 2017-11-21 | 南京国电南自电网自动化有限公司 | A kind of forward-order current for preventing restricted earth protection malfunction intersects braking method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100388582C (en) | 2008-05-14 |
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|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080514 Termination date: 20101202 |