CN1558495A - Phase-splitting integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation - Google Patents
Phase-splitting integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation Download PDFInfo
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- CN1558495A CN1558495A CNA2004100162892A CN200410016289A CN1558495A CN 1558495 A CN1558495 A CN 1558495A CN A2004100162892 A CNA2004100162892 A CN A2004100162892A CN 200410016289 A CN200410016289 A CN 200410016289A CN 1558495 A CN1558495 A CN 1558495A
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- differential protection
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Abstract
The invention discloses a phase-splitting integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation, wherein the three-phase difference currents in the transformer differential protection constitute ratio braking element with the maximum value of zero-sequence current on each of the neutral point earthing end (or branches), when the positive input end signal is less than the negative input end signal on the comparator 51-53, the comparator outputs 0, the corresponding differential current is judged to be the error current caused by the faults outside the area, and outputs corresponding brake signal, brake the corresponding phase ratio differential protection, thus preventing the differential protection accidental operation of the transformer, otherwise the comparator outputs 1, and the corresponding differential protection actuations are allowed. The advantage of the invention is, the transformer differential protection false operation resulted from neutral ground lateral area outer earth fault can be fully prevented, without influencing the in-area breakdown, the correct actuation of differential protection can be guaranteed.
Description
Technical field
The present invention relates to a kind of protection equipment for transformer, particularly a kind of phase-splitting synthetical restraint device 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 synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection, by the three-phase differential current that from transformer differential protection, obtains respectively with the zero-sequence current weighted sum value component ratio braking member of each neutral ground side (or branch) of transformer, when rate value during less than setting value, 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, and the transformer differential protection malfunction that external ground fault in neutral ground lateral areas causes.
A kind of phase-splitting synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection; this device circuit constitutes as shown in Figure 1; it is characterized in that: this device by filter 01,02 ... 0n, multiplier 21,22 ... 2n, adder 3, multiplier 4, filter 11～13, comparator 51～53 constitute, its median filter 01,02 ... the input of 0n is the zero-sequence current instantaneous value signal 3i of each neutral ground side (or branch) of input transformer respectively
10, 3i
20... 3i
N0, its output respectively with multiplier 21,22 ... the input of 2n is connected, multiplier 21,22 ... another input of 2n is imported respectively and is preestablished weights k
10, k
20... k
N0Its output connects the input of adder 3 respectively; an input of multiplier 4 is connected with the output of adder 3; its another input input setting value K; the output of multiplier 4 connects the negative input end of comparator 51～53 respectively, and the input of 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 connects the positive input terminal of comparator 51～53 respectively, and the output of comparator 51～53 is exported A phase, B phase, C phase brake signal respectively.Arrive the same side, same no-load voltage ratio and weights 0＜(k in differential current and zero-sequence current reduction
10, k
20... k
N0Under the situation of)≤1, setting value K is 0＜K＜1/3, and n is a transformer neutral point ground connection side number (or branches).Positive input terminal signal in comparator 51～53 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.
With prior art relatively; advantage of the present invention is to have proposed first in traditional multiple-limb transformer differential protection; add a kind of by the three-phase differential current that from transformer differential protection, obtains respectively with the zero-sequence current weighted sum value component ratio braking member of each neutral ground side (or branch) of transformer; 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.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 is the circuit block diagram that prevents the phase-splitting synthetical restraint device of multiple-limb transformer differential protection malfunction.
Embodiment
Embodiment 1
A kind of phase-splitting synthetical restraint device 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 51～53 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.When differential current and zero-sequence current reduction to the same side, same no-load voltage ratio and weights k
10=0.8, k
20=0.6, k
30Under=0.3 the situation, K is 0.2.The advantage of this device 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, and the correct operation of differential protection under the zone of influence internal fault situation not.
Claims (2)
1. phase-splitting synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection; it is characterized in that: this device by filter (01,02 ... 0n), multiplier (21,22 ... 2n), adder (3), multiplier (4), filter (11～13), comparator (51～53) constitute, its median filter (01,02 ... input 0n) is the zero-sequence current instantaneous value signal (3i of each neutral ground side (or branch) of input transformer respectively
10, 3i
20... 3i
N0), its output respectively with multiplier (21,22 ... input 2n) is connected, multiplier (21,22 ... another input 2n) is imported respectively and is preestablished weights (k
10, k
20... k
N0); its output connects the input of adder (3) respectively; an input of multiplier (4) is connected with the output of adder (3); its another input input setting value (K); the negative input end of comparator (51～53) connects the output of multiplier (4) respectively, and the input of 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 connects the positive input terminal of comparator phase (51～53) respectively, and the output of comparator (51～53) is exported (A) phase, (B) phase, (C) phase brake signal respectively, (n) is transformer neutral point ground connection side number (or branches).
2. brake apparatus according to claim 1 is characterized in that: differential current and zero-sequence current reduction to the same side, same no-load voltage ratio and weights 0＜(k
10, k
20... k
N0Under the situation of)≤1, setting value (K) is 0＜K＜1/3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162892A CN100433487C (en) | 2004-02-13 | 2004-02-13 | Phase-splitting integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162892A CN100433487C (en) | 2004-02-13 | 2004-02-13 | Phase-splitting integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558495A true CN1558495A (en) | 2004-12-29 |
| CN100433487C CN100433487C (en) | 2008-11-12 |
Family
ID=34351803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100162892A Expired - Fee Related CN100433487C (en) | 2004-02-13 | 2004-02-13 | Phase-splitting integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100433487C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171533A (en) * | 2016-03-07 | 2017-09-15 | 精工半导体有限公司 | Switching regulaor |
| CN107425826A (en) * | 2017-07-19 | 2017-12-01 | 广东美芝制冷设备有限公司 | Adaptive filter method, sef-adapting filter and storage medium |
Family Cites Families (4)
| 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 |
| 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 CNB2004100162892A patent/CN100433487C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107171533A (en) * | 2016-03-07 | 2017-09-15 | 精工半导体有限公司 | Switching regulaor |
| CN107171533B (en) * | 2016-03-07 | 2020-03-27 | 艾普凌科有限公司 | Switching regulator |
| CN107425826A (en) * | 2017-07-19 | 2017-12-01 | 广东美芝制冷设备有限公司 | Adaptive filter method, sef-adapting filter and storage medium |
| CN107425826B (en) * | 2017-07-19 | 2020-12-15 | 广东美芝制冷设备有限公司 | Adaptive filtering method, adaptive filter, and storage medium |
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| Publication number | Publication date |
|---|---|
| CN100433487C (en) | 2008-11-12 |
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Granted publication date: 20081112 Termination date: 20110213 |