CN100367598C - Positive sequence synthesized brake device for preventing multiple-branch voltage transformer differential protection unwanted operation - Google Patents
Positive sequence synthesized brake device for preventing multiple-branch voltage transformer differential protection unwanted operation Download PDFInfo
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- CN100367598C CN100367598C CNB2004100162888A CN200410016288A CN100367598C CN 100367598 C CN100367598 C CN 100367598C CN B2004100162888 A CNB2004100162888 A CN B2004100162888A CN 200410016288 A CN200410016288 A CN 200410016288A CN 100367598 C CN100367598 C CN 100367598C
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- differential protection
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- transformer
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Abstract
The present invention relates to a positive sequence synthesized braking device for preventing the unwanted operation of differential protection for multiple-branch transformers; each ratio braking elements is composed of a positive electric current of a basal wave of a three-phase differential electric current in the differential protection for transformers and the maximum value in a zero sequence electric current at each neutral point grounding side (each branch) of the transformer; when a signal at the positive input end of a comparator 5 is weaker than a signal at the negative end, the comparator 5 outputs 0; an external grounding fault is judged; a three-phase ratio differential protection outlet is locked; or the comparator 5 outputs 1; the three-phase differential protection is allowed to act. The present invention has the advantage 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 when the errors of a three-phase electric current transformer are not consistent.
Description
Technical field
The present invention relates to a kind of protection equipment for transformer, particularly a kind of synthetic brake apparatus of positive sequence 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 synthetic brake apparatus of positive sequence that prevents the malfunction of multiple-limb transformer differential protection, by with the maximum component ratio braking member in the zero-sequence current of the fundamental positive sequence electric current of 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, output three-phase phase brake signal, 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 synthetic brake apparatus of positive sequence 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 first group of filter 01,02 ... 0n, fundamental positive sequence pass filter 1, second group of filter 2, maximizing circuit 3, multiplier 4, comparator 5 constitute; Wherein first group of 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 ground connection branch
10, 3i
20... 3i
N0, its output connects the input of maximizing circuit 3 respectively; An input of multiplier 4 is connected with the output of maximizing circuit 3, its another input input setting value K; The negative input end of comparator 5 connects the output of multiplier 4; Three inputs of fundamental positive sequence pass filter 1 are imported the three-phase differential current instantaneous value signal i that obtains respectively from transformer differential protection
Da, i
Db, i
Dc, the input of second group of filter 2 of its output termination, the positive input terminal of the output of second group of filter 2 and comparator 5 joins; Comparator 5 output three-phase brake signals.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, and n is transformer neutral point ground connection side number or ground connection branches.When comparator 5 positive input terminal signals less than the negative input end signal, comparator 5 output 0 is judged to district's external ground fault, the outlet of locking rate of three phase flow differential protection; Otherwise comparator 5 outputs 1 allow the action of three-phase differential protection.
With prior art relatively; advantage of the present invention be proposed first in traditional multiple-limb transformer differential protection, to have added a kind of by with the maximum component ratio braking member in the zero-sequence current of the fundamental positive sequence electric current of 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 situation; 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 synthetic brake apparatus of positive sequence of multiple-limb transformer differential protection malfunction.
Embodiment
Embodiment 1
The synthetic brake apparatus of a kind of positive sequence 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 5 positive input terminal signals less than the negative input end signal, comparator 5 output 0 is judged to district's external ground fault, the differential outlet of locking rate of three phase flow; Otherwise comparator 5 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, setting value K gets 0.8.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.
Claims (2)
1. synthetic brake apparatus of the positive sequence that prevents the malfunction of multiple-limb transformer differential protection is characterized in that: this device by first group of filter (01,02 ... 0n), fundamental positive sequence pass filter (1), second group of filter (2), maximizing circuit (3), multiplier (4), comparator (5) constitute; Wherein first group of filter (01,02 ... input difference each the neutral ground side of input transformer 0n) or the zero-sequence current instantaneous value signal (3i of ground connection branch
10, 3i
20... 3i
N0), its output is connected with the input of maximizing circuit (3) respectively; The output of an input termination maximizing circuit (3) of multiplier (4), its another input input setting value K; The negative input end of comparator (5) connects the output of multiplier (4); Three inputs of fundamental positive sequence pass filter (1) are imported the three-phase differential current instantaneous value signal (i that obtains respectively from transformer differential protection
Da, i
Db, i
Dc), the input of its output second group of filter of termination (2); The positive input terminal of the output of second group of filter (2) and comparator (5) joins; Comparator (5) output three-phase brake signal, n is transformer neutral point ground connection side number or ground connection branches, when comparator (5) positive input terminal signal less than the negative input end signal, comparator (5) output 0, be judged to district's external ground fault, the outlet of locking rate of three phase flow differential protection; Otherwise comparator (5) output 1 allows the action of three-phase differential protection.
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 in differential current and zero-sequence current reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162888A CN100367598C (en) | 2004-02-13 | 2004-02-13 | Positive sequence synthesized brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162888A CN100367598C (en) | 2004-02-13 | 2004-02-13 | Positive sequence synthesized brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558494A CN1558494A (en) | 2004-12-29 |
| CN100367598C true CN100367598C (en) | 2008-02-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100162888A Expired - Fee Related CN100367598C (en) | 2004-02-13 | 2004-02-13 | Positive sequence synthesized brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
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| CN (1) | CN100367598C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105071346B (en) * | 2015-08-27 | 2017-11-21 | 南京国电南自电网自动化有限公司 | A kind of forward-order current for preventing restricted earth protection malfunction intersects braking method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0538041A (en) * | 1991-08-01 | 1993-02-12 | Kansai Electric Power Co Inc:The | Detecting device for abnormality of differential relay |
| JPH0833192A (en) * | 1994-07-21 | 1996-02-02 | Toshiba Corp | Relay controller |
-
2004
- 2004-02-13 CN CNB2004100162888A patent/CN100367598C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0538041A (en) * | 1991-08-01 | 1993-02-12 | Kansai Electric Power Co Inc:The | Detecting device for abnormality of differential relay |
| JPH0833192A (en) * | 1994-07-21 | 1996-02-02 | Toshiba Corp | Relay controller |
Non-Patent Citations (2)
| Title |
|---|
| 变压器零序差动保护的讨论. 朱声石.电力自动化设备，第23卷第10期. 2003 * |
| 数字式比率差动继电器的通用特性. 朱声石.电力系统自动化，第23卷第11期. 1999 * |
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|---|---|
| CN1558494A (en) | 2004-12-29 |
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Granted publication date: 20080206 Termination date: 20100213 |