CN100350702C - Phase sequence synthesized integration method for preventing multiple-branch voltage transformer differential protection unwanted operation by utilizing fault components - Google Patents
Phase sequence synthesized integration method for preventing multiple-branch voltage transformer differential protection unwanted operation by utilizing fault components Download PDFInfo
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- CN100350702C CN100350702C CNB2004100163151A CN200410016315A CN100350702C CN 100350702 C CN100350702 C CN 100350702C CN B2004100163151 A CNB2004100163151 A CN B2004100163151A CN 200410016315 A CN200410016315 A CN 200410016315A CN 100350702 C CN100350702 C CN 100350702C
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Abstract
The present invention relates to a phase sequence synthesized integration method for preventing the unwanted operation of differential protection for multiple-branch transformers by utilizing fault components. A ratio braking element is composed of a positive sequence abrupt quantity of a basal wave or a negative sequence abrupt quantity of the basal wave of a three-phase differential electric current in the differential protection for transformers and a weighted sum value of a zero sequence electric current abrupt quantity at each neutral point grounding side (or branch); when a ratio value is smaller than a definite value K, an external grounding fault at the neutral point grounding side is judged; a three-phase braking signal is output to stop differential protection for transformer radios. The present invention has the advantage that the present invention can thoroughly avoid the unwanted operation of differential protection for transformers caused by the external grounding fault at the neutral point grounding side when the errors of a three-phase electric current transformer are not consistent.
Description
Technical field
The present invention relates to a kind of transformer protection method, particularly a kind of comprehensive zero-sequence braking method of fault component phase sequence 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; By shoving and the overexcitation braking member, promptly, discern magnetizing inrush current and overexcitation electric current simultaneously, reach the purpose of differentiating internal fault by analyzing the waveform or the harmonic content of differential current.To both sides being arranged or being the power transformer of neutral-point solid ground more than the both sides, when a neutral ground side generating region external ground fault, may big earth fault zero-sequence current appear a plurality of ground connection sides.For preventing that this zero-sequence current from causing differential protection malfunction, extensively adopt the method that neutral ground side three-phase current is carried out conversion at present, eliminate the influence of zero-sequence current.But it is inconsistent to work as ground connection side threephase current transformer error; and transformer is only when the ground connection side that external area error takes place has power supply; can not eliminate the influence of the zero-sequence current that external ground fault in ground connection lateral areas causes by conventional method; bigger differential unsymmetrical current will be had; ratio brake element, the braking member that shoves 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.
Summary of the invention
The purpose of this invention is to provide a kind of comprehensive zero-sequence braking method of fault component phase sequence that prevents malfunction for tranformer protection; the weighted sum value component ratio braking criterion of the fundamental positive sequence sudden change amount by the three-phase differential current in the transformer differential protection or the zero-sequence current sudden change amount of first-harmonic negative phase-sequence sudden change amount and each neutral ground side or branch; when rate value during less than setting value K; be judged to neutral ground lateral areas external ground fault; output three-phase brake signal is braked the rate of three phase flow differential protection.Advantage of the present invention is, in the time of can avoiding the threephase current transformer error inconsistent fully, and the transformer differential protection malfunction that external ground fault in neutral ground lateral areas causes.
A kind of comprehensive zero-sequence braking method of fault component phase sequence that prevents malfunction for tranformer protection, it is characterized in that: the weighted sum value component ratio braking criterion of the fundamental positive sequence sudden change amount by the three-phase differential current in the transformer differential protection or the zero-sequence current sudden change amount of first-harmonic negative phase-sequence sudden change amount and each neutral ground side or branch, when the fundamental positive sequence sudden change amount of three-phase differential current or first-harmonic negative phase-sequence sudden change amount divided by the rate value of the weighted sum value of the zero-sequence current sudden change amount of each neutral ground side or branch during less than setting value K, be judged to district's external ground fault, output three-phase brake signal, the rate of three phase flow differential protection is braked, prevented the transformer differential protection malfunction;
The foundation of utilizing the comprehensive zero-sequence braking of fault component phase sequence to differentiate multiple-limb transformer district's external ground fault is:
f(Δi
da、Δi
db、Δi
dc)/(Δ3I
10×k
10+Δ3I
20×k
20+……+Δ3I
no
×k
n0)＜K
(the Δ i of f in the formula
Da, Δ i
Db, Δ i
Dc) be the fundamental positive sequence sudden change amount or the first-harmonic negative phase-sequence sudden change amount of three-phase differential current sudden change amount, Δ 3I
10, Δ 3I
20... Δ 3I
NoBe the zero-sequence current sudden change amount of each neutral ground side or branch, k
10, k
20... k
N0Be predefined weights, Δ 3I
10* k
10+ Δ 3I
20* k
20+ ... + Δ 3I
No* k
N0Be the weighted sum value of the zero-sequence current sudden change amount of each neutral ground side or branch, K is a setting value, when zero-sequence current and the reduction of three-phase differential current to the same side, same no-load voltage ratio and weights are at 0＜(k
10, k
20... k
N0Under the situation of)≤1, setting value K is 0＜K＜1, and n is transformer neutral point ground connection side number or branches.
With prior art relatively; advantage of the present invention is the weighted sum value component ratio braking criterion that proposes the zero-sequence current sudden change amount of fundamental positive sequence sudden change amount by the three-phase differential current in the transformer differential protection or first-harmonic negative phase-sequence sudden change amount and each neutral ground side or branch first; when rate value during less than setting value K; be judged to neutral ground lateral areas external ground fault; output three-phase brake signal is braked the rate of three phase flow differential protection.Use this programme; in the time of can avoiding the threephase current transformer error inconsistent fully; the transformer differential protection malfunction that external ground fault in neutral ground lateral areas 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, and the correct operation of differential protection under the zone of influence internal fault situation not.
Description of drawings
Fig. 1 synthesizes the circuit block diagram of synthetical restraint device for realizing a kind of positive sequence of utilizing fault component to prevent the malfunction of multiple-limb transformer differential protection of the present invention.
Embodiment
A kind of comprehensive zero-sequence braking method of fault component phase sequence that prevents malfunction for tranformer protection; this method can be achieved by the circuit that a kind of positive sequence of utilizing fault component to prevent the malfunction of multiple-limb transformer differential protection of Fig. 2 is synthesized the synthetical restraint device; this device is by memory 11～13; subtracter 21～23; fundamental positive sequence pass filter 31; filter 32; memory 41; 42; 43; subtracter 51; 52; 53; filter 61; 62; 63; multiplier 71; 72; 73; adder 81; multiplier 82; comparator 9 constitutes, wherein the three-phase differential current instantaneous value signal i of the positive input terminal of the input of memory 11～13 and subtracter 21～23 difference input transformer differential protection formation
Da, i
Db, i
DcThe negative input end of subtracter 21～23 connects the output of memory 11～13 respectively, its output is connected with three inputs of fundamental positive sequence pass filter 31 respectively, the output of the input termination fundamental positive sequence pass filter 31 of filter 32, the positive input terminal of its output termination comparator 9; Positive input terminal difference each the neutral ground side of input transformer of the input of memory 41,42,43 and subtracter 51,52,53 or the zero-sequence current instantaneous value signal 3i of branch
10, 3i
20, 3i
3oThe negative input end of subtracter 51,52,53 connects the output of memory 41,42,43 respectively, its output is connected with the input of filter 61,62,63 respectively, an input of multiplier 71,72,73 connects the output of filter 61,62,63 respectively, and its another input is imported respectively and preestablished weights k
10, k
20, k
30The input of adder 81 connects the output of multiplier 71,72,73 respectively, and an input of its output and multiplier 82 joins, another input input setting value K of multiplier 82, the negative input end of its output termination comparator 9, the output output three-phase brake signal of comparator 9.Arrive the same side, same no-load voltage ratio and weights k in differential current and zero-sequence current reduction
10=0.8, k
20=0.6, k
30Under=0.3 the situation, setting value K is 0.5.When the positive input terminal signal of comparator 9 less than the negative input end signal, comparator 9 outputs 0 are judged to district's external ground fault, the outlet of locking rate of three phase flow differential protection; Otherwise comparator 9 outputs 1 allow the action of three-phase differential protection.The advantage of using this method is, the transformer differential protection malfunction that can avoid external ground fault in neutral ground lateral areas to cause fully, and the correct operation of differential protection under the zone of influence internal fault situation not.
Claims (1)
- A kind of comprehensive zero-sequence braking method of fault component phase sequence that prevents malfunction for tranformer protection, it is characterized in that: the weighted sum value component ratio braking criterion of the fundamental positive sequence sudden change amount by the three-phase differential current in the transformer differential protection or the zero-sequence current sudden change amount of first-harmonic negative phase-sequence sudden change amount and each neutral ground side or branch, when the fundamental positive sequence sudden change amount of three-phase differential current or first-harmonic negative phase-sequence sudden change amount divided by the rate value of the weighted sum value of the zero-sequence current sudden change amount of each neutral ground side or branch during less than setting value K, be judged to district's external ground fault, output three-phase brake signal, the rate of three phase flow differential protection is braked, prevented the transformer differential protection malfunction;The foundation of utilizing the comprehensive zero-sequence braking of fault component phase sequence to differentiate multiple-limb transformer district's external ground fault is:f(Δi da、Δi db、Δi dc)/(Δ3I 10×k 10+Δ3I 20×k 20+……+Δ3I no×k n0)＜K(the Δ i of f in the formula Da, Δ i Db, Δ i Dc) be the fundamental positive sequence sudden change amount or the first-harmonic negative phase-sequence sudden change amount of three-phase differential current sudden change amount, Δ 3I 10, Δ 3I 20... Δ 3I NoBe the zero-sequence current sudden change amount of each neutral ground side or branch, k 10, k 20... k N0Be predefined weights, Δ 3I 10* k 10+ Δ 3I 20* k 20+ ... + Δ 3I No* k N0Be the weighted sum value of the zero-sequence current sudden change amount of each neutral ground side or branch, K is a setting value, when zero-sequence current and the reduction of three-phase differential current to the same side, same no-load voltage ratio and weights are at 0＜(k 10, k 20... k N0Under the situation of)≤1, setting value K is 0＜K＜1, and n is transformer neutral point ground connection side number or branches.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100163151A CN100350702C (en) | 2004-02-13 | 2004-02-13 | Phase sequence synthesized integration method for preventing multiple-branch voltage transformer differential protection unwanted operation by utilizing fault components |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100163151A CN100350702C (en) | 2004-02-13 | 2004-02-13 | Phase sequence synthesized integration method for preventing multiple-branch voltage transformer differential protection unwanted operation by utilizing fault components |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558520A CN1558520A (en) | 2004-12-29 |
| CN100350702C true CN100350702C (en) | 2007-11-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100163151A Expired - Fee Related CN100350702C (en) | 2004-02-13 | 2004-02-13 | Phase sequence synthesized integration method for preventing multiple-branch voltage transformer differential protection unwanted operation by utilizing fault components |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10257667A (en) * | 1997-03-07 | 1998-09-25 | Mitsubishi Electric Corp | Power system protector |
| CN1047887C (en) * | 1994-01-06 | 1999-12-29 | 施耐德电器公司 | Device for differentially protecting a power transformer |
| 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 |
| CN1402900A (en) * | 1999-11-29 | 2003-03-12 | 施魏策尔工程实验公司 | System for power transformer differential protection |
| 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
- 2004-02-13 CN CNB2004100163151A patent/CN100350702C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047887C (en) * | 1994-01-06 | 1999-12-29 | 施耐德电器公司 | Device for differentially protecting a power transformer |
| JPH10257667A (en) * | 1997-03-07 | 1998-09-25 | Mitsubishi Electric Corp | Power system protector |
| CN1402900A (en) * | 1999-11-29 | 2003-03-12 | 施魏策尔工程实验公司 | System for power transformer differential protection |
| 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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|---|---|
| CN1558520A (en) | 2004-12-29 |
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Granted publication date: 20071121 Termination date: 20100213 |