CN1558498A - Maximum differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation - Google Patents
Maximum differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation Download PDFInfo
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- CN1558498A CN1558498A CNA2004100162924A CN200410016292A CN1558498A CN 1558498 A CN1558498 A CN 1558498A CN A2004100162924 A CNA2004100162924 A CN A2004100162924A CN 200410016292 A CN200410016292 A CN 200410016292A CN 1558498 A CN1558498 A CN 1558498A
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- differential protection
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Abstract
The invention discloses a maximum differential flow 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 comparators, the comparator outputs 0, the lateral area outer ground fault is determined, the three-phase differential protection exit is locked, otherwise the comparator 6 outputs 1, and the corresponding differential protection actuations are allowed. The advantage of the invention is, the transformer differential protection accidental operation resulted from ground fault outside the lateral area when the errors of the three-phase current transformer are in inconformity without influencing the correct actuation of the differential protection under the circumstance of in-area faults.
Description
Technical field
The present invention relates to a kind of protection equipment for transformer, particularly a kind of maximum difference stream 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 maximum difference stream synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection; the weighted sum value component ratio braking member of the zero-sequence current by the maximum in the three-phase differential current that from transformer differential protection, obtains and each neutral ground side (or branch) of transformer; when rate value during less than setting value K; be judged to district's external ground fault, the outlet of locking three-phase 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, and the correct operation of differential protection under the zone of influence internal fault situation not.
A kind of maximum difference stream 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: a kind of maximum difference stream synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection; it is characterized in that: this device is by filter 01; 02; 0n; multiplier 31; 32; 3n; adder 4; multiplier 5; filter 11～13; maximizing circuit 2; comparator 6 constitutes 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
103i
20... 3i
N0, its output connect respectively multiplier 31,32 ... the input of 3n, multiplier 31,32 ... another input of 3n is imported respectively and is preestablished weights k
10, k
20... k
N0Its output connects the input of adder 4 respectively; the output of an input termination adder 4 of multiplier 5; its another input input setting value K; the output of the negative input end of comparator 6 and multiplier 5 joins, 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 input of maximizing circuit 2 respectively, and the output of maximizing circuit 2 is connected with the positive input terminal of comparator 6, comparator 6 output three-phase brake signals.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).When the positive input terminal signal of comparator 6 less than the negative input end signal, comparator 6 outputs 0 are judged to district's external ground fault, the outlet of locking rate of three phase flow differential protection; Otherwise comparator 6 outputs 1 allow the action of three-phase differential protection.
With prior art relatively; advantage of the present invention is to have proposed first in traditional transformer differential protection; add a kind of ratio brake element that constitutes by the zero-sequence current weighted sum value of the maximum in the three-phase differential current that from transformer differential protection, obtains and each neutral ground side (or branch) of transformer; when rate value during less than setting value K; be judged to district's external ground fault, the outlet of locking 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 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 maximum difference stream synthetical restraint device of multiple-limb transformer differential protection malfunction.
Embodiment
Embodiment 1
A kind of maximum difference stream 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 of comparator 6 during less than the negative input end signal, comparator 6 outputs 0 are judged to district's external ground fault, the outlet of locking rate of three phase flow differential protection; Otherwise comparator 6 outputs 1 allow the action of three-phase differential protection.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, setting value K is 0.1.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. maximum difference stream 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 (31,32 ... 3n), adder (4), multiplier (5), filter (11～13), maximizing circuit (2), comparator (6) 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 connect respectively multiplier (31,32 ... input 3n), multiplier (31,32 ... another input 3n) is imported respectively and is preestablished weights (k
10, k
20... k
N0); its output connects the input of adder (4) respectively; the output termination of an input termination adder (4) of multiplier (5); its another input input setting value (K); the output of the negative input end of comparator (6) and multiplier (5) joins, 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 input of maximizing circuit (2) respectively, the output of maximizing circuit (2) is connected with the positive input terminal of comparator (6), and the output output three-phase brake signal of comparator (6) (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 |
|---|---|---|---|
| CNB2004100162924A CN100413166C (en) | 2004-02-13 | 2004-02-13 | Maximum differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162924A CN100413166C (en) | 2004-02-13 | 2004-02-13 | Maximum differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558498A true CN1558498A (en) | 2004-12-29 |
| CN100413166C CN100413166C (en) | 2008-08-20 |
Family
ID=34351806
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100162924A Expired - Fee Related CN100413166C (en) | 2004-02-13 | 2004-02-13 | Maximum differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100413166C (en) |
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 |
| CN2689558Y (en) * | 2004-02-13 | 2005-03-30 | 浙江大学 | Maximum differential comprehensive braker for preventing multi-branch transformer differential protector from malfunction |
-
2004
- 2004-02-13 CN CNB2004100162924A patent/CN100413166C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN100413166C (en) | 2008-08-20 |
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Granted publication date: 20080820 Termination date: 20110213 |