CN1558493A - Maximum differential flow brake device for preventing multiple-branch voltage transformer differential protection unwanted operation - Google Patents
Maximum differential flow brake device for preventing multiple-branch voltage transformer differential protection unwanted operation Download PDFInfo
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- CN1558493A CN1558493A CNA2004100162873A CN200410016287A CN1558493A CN 1558493 A CN1558493 A CN 1558493A CN A2004100162873 A CNA2004100162873 A CN A2004100162873A CN 200410016287 A CN200410016287 A CN 200410016287A CN 1558493 A CN1558493 A CN 1558493A
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- differential protection
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- transformer
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Abstract
The invention discloses a maximum differential flow 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 comparator outputs 0, the lateral area outer ground fault is determined, the three-phase differential protection exit is locked, 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 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 maximum difference stream 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 maximum difference stream brake apparatus that prevents the malfunction of multiple-limb transformer differential protection; by the maximum component ratio in the zero-sequence current of the maximum in the three-phase differential current in the usefulness transformer differential protection 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.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 maximum difference stream 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 filter 01,02 ... 0n, filter 11～13, maximizing circuit 21,22, multiplier 3, comparator 4 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 connects the input of maximizing circuit 22 respectively; an input of the output termination multiplier 3 of maximizing circuit 22; another input input setting value K of multiplier 3; the negative input end of the output termination comparator 4 of multiplier 3, the input of filter 11～13 are 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 21 respectively, and the positive input terminal of comparator 4 is connected with the output of maximizing circuit 21, the output output three-phase brake signal of comparator 4.Arrive under the same side, the same no-load voltage ratio situation in differential current and zero-sequence current reduction, the K value is 0＜K＜1/3, and n is a transformer neutral point ground connection side number (or branches).When comparator 4 positive input terminal signals less than the negative input end signal, comparator output 0 is judged to district's external ground fault, the outlet of locking biased differential protection; Otherwise comparator output 1 allows the differential protection action.
With prior art relatively; advantage of the present invention is to have proposed first to add in traditional multiple-limb transformer differential protection to pass through with the maximum component ratio braking member in the zero-sequence current of the maximum in the three-phase differential current in the transformer differential protection 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 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 maximum difference stream brake apparatus of multiple-limb transformer differential protection malfunction.
Embodiment
A kind of maximum difference stream brake apparatus that prevents the malfunction of multiple-limb transformer differential protection, its circuit structure as shown in Figure 1, transformer neutral point ground connection side is counted n=3.When comparator 4 positive input terminal signals less than the negative input end signal, comparator 4 output 0 is judged to district's external ground fault, the differential outlet of locking rate of three phase flow; Otherwise comparator 4 outputs 1 allow 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, K gets 0.1.The advantage of using this programme 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.
Claims (2)
1. maximum difference stream 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 (21,22), multiplier (3), comparator (4) 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
203i
N0); its output is connected with the input of maximizing circuit (22) respectively; an input of the output termination multiplier (3) of maximizing circuit (22); another input input setting value (K) of multiplier (3); the negative input end of its output termination comparator (4), 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 (21) respectively, the positive input terminal of the output of maximizing circuit (21) and comparator (4) joins, and comparator (4) 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 |
|---|---|---|---|
| CNB2004100162873A CN100367597C (en) | 2004-02-13 | 2004-02-13 | Maximum differential flow brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162873A CN100367597C (en) | 2004-02-13 | 2004-02-13 | Maximum differential flow brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558493A true CN1558493A (en) | 2004-12-29 |
| CN100367597C CN100367597C (en) | 2008-02-06 |
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ID=34351801
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100162873A Expired - Fee Related CN100367597C (en) | 2004-02-13 | 2004-02-13 | Maximum differential flow brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100367597C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112034398A (en) * | 2020-08-28 | 2020-12-04 | 积成软件有限公司 | Transformer low-voltage side cell differential braking curve scanning method |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3143498B2 (en) * | 1991-08-01 | 2001-03-07 | 関西電力株式会社 | Abnormality detection device in differential relay |
| JPH0833192A (en) * | 1994-07-21 | 1996-02-02 | Toshiba Corp | Relay controller |
| 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 |
-
2004
- 2004-02-13 CN CNB2004100162873A patent/CN100367597C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112034398A (en) * | 2020-08-28 | 2020-12-04 | 积成软件有限公司 | Transformer low-voltage side cell differential braking curve scanning method |
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| Publication number | Publication date |
|---|---|
| CN100367597C (en) | 2008-02-06 |
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Granted publication date: 20080206 Termination date: 20100213 |