CN1558492A - Three-phase brake device for preventing multiple-branch voltage transformer differential protection unwanted operation - Google Patents
Three-phase brake device for preventing multiple-branch voltage transformer differential protection unwanted operation Download PDFInfo
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- CN1558492A CN1558492A CNA2004100162869A CN200410016286A CN1558492A CN 1558492 A CN1558492 A CN 1558492A CN A2004100162869 A CNA2004100162869 A CN A2004100162869A CN 200410016286 A CN200410016286 A CN 200410016286A CN 1558492 A CN1558492 A CN 1558492A
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- differential protection
- transformer
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Abstract
The invention discloses a three-phase 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 ratio value is less than a setting value K, the corresponding differential current is judged to be the error current caused by the faults outside the area, the comparator outputs 0, the signal is outputted through an OR gate 5, or when the OR gate 5 outputs 0, the three-phase differential protection exit is locked, or when the OR gate 5 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, and 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 three-phase 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 object of the present invention is to provide a kind of three-phase brake apparatus that prevents the malfunction of multiple-limb transformer differential protection; zero-sequence current maximum by three-phase differential current and each neutral ground side (or branch) of transformer constitutes three ratio brake elements; when differential current and zero-sequence current rate value during less than setting value K; declaring corresponding phase differential current is the error current that external area error causes; signal through or door output after, 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 three-phase brake apparatus 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, filter become as shown in Figure 1; it is characterized in that: this device by filter 01,02 ... 0n, filter 11～13, maximizing circuit 2, multiplier 3, comparator 41～43 and or door 5 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
N0Its 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 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 41～43 respectively, or three inputs of door 5 are connected its output output three-phase brake signal respectively with the output of comparator 41～43.Positive input terminal signal in comparator 41～43 is less than the negative input end signal, and comparator exports 0, and declaring corresponding phase differential current is the error current that external area error causes, otherwise comparator output 1, signal warp or door 5 outputs.Or door 5 was exported the outlet of locking rate of three phase flow differential protection, comparator output 1, the action of permission three-phase differential protection at 0 o'clock.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, and n is a transformer neutral point ground connection side number (or branches).
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 of each neutral ground side (or branch) in maximum component ratio braking member; when rate value during less than setting value K; declaring corresponding phase differential current is the error current that external area error causes; signal warp or door output, 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 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 three-phase brake apparatus of multiple-limb transformer differential protection malfunction.
Embodiment
Embodiment 1
A kind of three-phase brake apparatus that prevents the malfunction of multiple-limb transformer differential protection, its circuit constitutes as shown in Figure 1, and transformer neutral point ground connection side is counted n=3.The signal of the positive input terminal in comparator 41～43 is less than the negative input end signal, and comparator exports 0, otherwise exports 1, signal warp or door 5 outputs.Or door 5 was exported locking rate of three phase flow differential protection general export at 0 o'clock; Exported 1 o'clock, and allowed the action of three-phase differential protection.Arrive under the same side, the same no-load voltage ratio situation in differential current and zero-sequence current reduction, setting value K gets 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. three-phase brake apparatus that prevents the malfunction of multiple-limb transformer differential protection; it is characterized in that: this device by filter (01,02 ... 0n), filter (11～13), maximizing circuit (2), multiplier (3), comparator (41～43) and or door (5) 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 joins 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 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 (41～43) respectively, or three inputs of door (5) are connected with the output of comparator (41～43) respectively, and its output output three-phase brake signal (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 |
|---|---|---|---|
| CNB2004100162869A CN100409523C (en) | 2004-02-13 | 2004-02-13 | Three-phase brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162869A CN100409523C (en) | 2004-02-13 | 2004-02-13 | Three-phase brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558492A true CN1558492A (en) | 2004-12-29 |
| CN100409523C CN100409523C (en) | 2008-08-06 |
Family
ID=34351800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100162869A Expired - Fee Related CN100409523C (en) | 2004-02-13 | 2004-02-13 | Three-phase brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100409523C (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 |
| CN2689556Y (en) * | 2004-02-13 | 2005-03-30 | 浙江大学 | Three-phase braker for preventing multi-branch transformer differential protector from malfunction |
-
2004
- 2004-02-13 CN CNB2004100162869A patent/CN100409523C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN100409523C (en) | 2008-08-06 |
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Granted publication date: 20080806 Termination date: 20110213 |