CN100394657C - Phase-splitting brake device for preventing multiple-branch voltage transformer differential protection unwanted operation - Google Patents
Phase-splitting brake device for preventing multiple-branch voltage transformer differential protection unwanted operation Download PDFInfo
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- CN100394657C CN100394657C CNB2004100162835A CN200410016283A CN100394657C CN 100394657 C CN100394657 C CN 100394657C CN B2004100162835 A CNB2004100162835 A CN B2004100162835A CN 200410016283 A CN200410016283 A CN 200410016283A CN 100394657 C CN100394657 C CN 100394657C
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- differential protection
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- transformer
- differential
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Abstract
The present invention relates to a phase-splitting braking device for preventing the unwanted operation of the differential protection for multiple-branch voltage transformers; ratio braking elements are composed of three-phase differential electric currents obtained from the differential protection for transformers and the maximum value in a zero-sequence electric current at each neutral point grounding side (or branch) of the transformer; an external grounding fault is identified by the size of a ratio value; when the value ratio is smaller than a definite value K, a comparator outputs 0; a corresponding differential electric current is judged to be an error current caused by the external grounding fault; then, a corresponding braking signal is output to stop differential protection for a corresponding phase ratio and to prevent the unwanted operation of differential protection for transformers; or the comparator outputs 1; corresponding differential protection is allowed to act. The proposal has the advantages 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, and has no influence on the correct action of differential protection for internal faults.
Description
Technical field
The present invention relates to a kind of protection equipment for transformer, particularly a kind of phase-splitting brake apparatus that prevents the malfunction of multiple-limb transformer differential 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 ground connection side generating region external ground fault, may big earth fault zero-sequence current appear many sides.For preventing that this zero-sequence current from causing differential protection malfunction, extensively adopt the method that ground connection 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 neutral ground 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 neutral ground lateral areas causes by conventional method; bigger differential unsymmetrical current will be had; the 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; the 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 phase-splitting brake apparatus that prevents the malfunction of multiple-limb transformer differential protection, by the maximum component ratio braking member in the zero-sequence current of the three-phase differential current that from transformer differential protection, obtains and each neutral ground side or branch, when rate value during less than setting value K, declaring corresponding phase differential current is the error current that external area error causes, export corresponding phase brake signal, corresponding phase ratio differential protection is braked, prevented the transformer differential protection malfunction; Advantage of the present invention is 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.
A kind of phase-splitting brake apparatus that prevents the malfunction of multiple-limb transformer differential protection; this device circuit structure as shown in Figure 1; it is characterized in that: this device by second filter 11～13, maximizing circuit 2, multiplier 3, comparator 41～43, n first filter 01,02 ... 0n constitutes, wherein n first filter 01,02 ... input difference each the neutral ground side of input transformer of 0n or the zero-sequence current instantaneous value signal 3i of branch
10, 3i
20... 3i
N0Its output is connected with the input of maximizing circuit 2 respectively; the output of an input termination maximizing circuit 2 of multiplier 3; its another input input setting value K; the negative input end of comparator 41～43 connects the output of multiplier 3, and the input of second filter 11～13 is imported the three-phase differential current instantaneous value signal i that obtains respectively from transformer differential protection
Da, i
Db, i
Dc, its output is connected with the positive input terminal of comparator 41～43 respectively, and comparator 41～43 is exported A phase, B phase, C phase brake signal respectively.Positive input terminal signal in comparator 41～43 is less than the negative input end signal, comparator output 0, declaring corresponding phase differential current is the error current that external area error causes, exports corresponding phase brake signal, corresponding phase ratio differential protection is braked, prevented the transformer differential protection malfunction; Otherwise comparator output 1 allows corresponding phase differential protection action.Arrive under the same side, the same no-load voltage ratio situation in differential current and zero-sequence current reduction, setting value K is: 0＜K＜1/3, n is transformer neutral point ground connection side number or branches.
With prior art relatively; advantage of the present invention is by the maximum component ratio braking member in the zero-sequence current of the three-phase differential current that obtains from transformer differential protection and each neutral ground side or branch; when rate value during less than setting value K; declaring corresponding phase differential current is the error current that external area error causes, the corresponding phase ratio differential protection outlet of locking.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 not under the zone of influence internal fault situation, the correct operation of differential protection.
Description of drawings
Fig. 1 is the circuit block diagram that prevents the phase-splitting brake apparatus of multiple-limb transformer differential protection malfunction.
Embodiment
Embodiment 1
A kind of phase-splitting brake apparatus that prevents the malfunction of multiple-limb transformer differential protection, this device circuit constitutes as shown in Figure 1, and transformer neutral point ground connection side is counted n=3.When the positive input terminal signal in the comparator 41～43 during less than the negative input end signal, comparator output 0, declaring corresponding phase differential current is the error current that external area error causes, exports corresponding phase brake signal, corresponding phase ratio differential protection is braked, prevented the transformer differential protection malfunction; Otherwise comparator output 1 allows corresponding phase differential protection action.Arrive under the same side, the same no-load voltage ratio situation in differential current and zero-sequence current reduction, K is 0.1.The advantage of this device is, the transformer differential protection malfunction that can avoid external ground fault in neutral ground lateral areas to cause fully, and not under the zone of influence internal fault situation, the correct operation of differential protection.
Claims (2)
1. phase-splitting brake apparatus that prevents the malfunction of multiple-limb transformer differential protection; it is characterized in that: this device by second filter (11～13), maximizing circuit (2), multiplier (3), comparator (41～43), n first filter (01,02 ... 0n) constitute, wherein n first filter (01,02 ... input difference each the neutral ground side of input transformer 0n) or the zero-sequence current instantaneous value signal (3i of branch
10, 3i
203i
N0); its output is connected with the input of maximizing circuit (2) respectively; an input of the output termination multiplier (3) of maximizing circuit (2); another input input setting value K of multiplier (3); the negative input end of its output termination comparator (41～43), the input of second filter (11～13) is imported the three-phase differential current instantaneous value signal (i that obtains respectively from transformer differential protection
Da, i
Db, i
Dc), its output is connected with the positive input terminal of comparator (41～43) respectively, and comparator (41～43) is exported A phase, B phase, C phase brake signal respectively, and n is transformer neutral point ground connection side number or branches.
2. brake apparatus according to claim 1 is characterized in that: under the same side, same no-load voltage ratio situation, setting value K is 0＜K＜1/3 in differential current and zero-sequence current reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162835A CN100394657C (en) | 2004-02-13 | 2004-02-13 | Phase-splitting brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162835A CN100394657C (en) | 2004-02-13 | 2004-02-13 | Phase-splitting brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558489A CN1558489A (en) | 2004-12-29 |
| CN100394657C true CN100394657C (en) | 2008-06-11 |
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ID=34351797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100162835A Expired - Fee Related CN100394657C (en) | 2004-02-13 | 2004-02-13 | Phase-splitting brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100394657C (en) |
Citations (4)
| 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 |
| 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 |
| CN2689555Y (en) * | 2004-02-13 | 2005-03-30 | 浙江大学 | Split-phase braker for preventing multi-branch transformer differential protector from malfunction |
-
2004
- 2004-02-13 CN CNB2004100162835A patent/CN100394657C/en not_active Expired - Fee Related
Patent Citations (4)
| 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 |
| 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 |
| CN2689555Y (en) * | 2004-02-13 | 2005-03-30 | 浙江大学 | Split-phase braker for preventing multi-branch transformer differential protector from malfunction |
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| Publication number | Publication date |
|---|---|
| CN1558489A (en) | 2004-12-29 |
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| PB01 | Publication | ||
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Granted publication date: 20080611 Termination date: 20110213 |