CN1558487A - Phase-splitting brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components - Google Patents
Phase-splitting brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components Download PDFInfo
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- CN1558487A CN1558487A CNA2004100162801A CN200410016280A CN1558487A CN 1558487 A CN1558487 A CN 1558487A CN A2004100162801 A CNA2004100162801 A CN A2004100162801A CN 200410016280 A CN200410016280 A CN 200410016280A CN 1558487 A CN1558487 A CN 1558487A
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- differential protection
- transformer
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- 230000007257 malfunction Effects 0.000 claims description 16
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Protection Of Transformers (AREA)
- Emergency Protection Circuit Devices (AREA)
Abstract
The invention discloses a phase-splitting brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components, wherein the three-phase difference current variation in the transformer differential protection constitute ratio braking element with the zero-sequence current variation, when the ratio of the differential current variation and the zero-sequence current variation is smaller than a setting value K, 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, brakes 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 accidental operation resulted from ground fault outside the Y0 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 phase-splitting brake apparatus that utilizes fault component to prevent the transformer differential protection malfunction
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 Y
0The power transformer of/delta connection is for preventing Y
0Lateral areas external ground fault zero-sequence current causes differential protection malfunction, extensively adopts Y at present
0The side three-phase current carries out the method for conversion, eliminates the influence of zero-sequence current.But work as Y
0Side threephase current transformer error is inconsistent, and transformer is only at the Y that external area error takes place
0When side has power supply, can not eliminate Y by conventional method
0The influence of the zero-sequence current that lateral areas external ground fault causes; bigger differential unsymmetrical current will be had; ratio brake element, the braking member that shoves can not reliably be braked this; especially very little even be under zero the situation at transformer opposite side load current; 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 brake apparatus that utilizes fault component to prevent the transformer differential protection malfunction; by with the sudden change amount of the three-phase differential current in the transformer differential protection respectively with the sudden change amount component ratio braking member of zero-sequence current; when the sudden change amount rate value of the sudden change amount of differential current and zero-sequence current 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 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 Y
0The transformer differential protection malfunction that lateral areas external ground fault causes, and the correct operation of differential protection under the zone of influence internal fault situation not.
A kind of phase-splitting brake apparatus that utilizes fault component to prevent the transformer differential protection malfunction; this device circuit constitutes as shown in Figure 1; it is characterized in that: this device is made of memory 11～14, subtracter 21～24, filter 31～34, multiplier 4, comparator 51～53, wherein the three-phase differential current instantaneous value signal i of the positive input terminal of the input of memory 11～13 and subtracter 21～23 difference input transformer differential protection formation
Da, i
Db, i
DcThe negative input end of subtracter 21～23 is connected with the output of memory 11～13 respectively, its output connects the input of filter 31～33 respectively, the output of filter 31～33 connects the positive input terminal of comparator 51～53 respectively, and the positive input terminal of the input of memory 14 and subtracter 24 is input transformer Y respectively
0Side zero-sequence current instantaneous value signal 3i
0The negative input end of subtracter 24 connects the output of memory 14, the input of filter 34 is connected with the output of subtracter 24, an input of its output termination multiplier 4, another input input setting value K of multiplier 4, its output connects the negative input end of comparator 51～53 respectively, and comparator 51～53 is exported the brake signal of A, B, C phase respectively.Arrive under the same side, the same no-load voltage ratio situation in differential current and the equal reduction of zero-sequence current, setting value K is 0＜K＜1/3.When comparator positive input terminal signal 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, and corresponding phase differential protection is braked, and prevents the transformer differential protection malfunction; Otherwise comparator output 1 allows corresponding phase differential protection action.
With prior art relatively, advantage of the present invention be proposed first in traditional transformer differential protection, to set up a kind of by with the differential current sudden change amount in the transformer differential protection respectively with zero-sequence current sudden change amount 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, export corresponding phase brake signal, corresponding phase 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, Y
0The transformer differential protection malfunction that lateral areas external ground fault 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 utilizes fault component to prevent the circuit block diagram of the phase-splitting brake apparatus of transformer differential protection malfunction.
Embodiment
Embodiment 1
A kind of phase-splitting brake apparatus that utilizes fault component to prevent the transformer differential protection malfunction, this device circuit constitutes as shown in Figure 1, arrives under the same side, the same no-load voltage ratio situation in differential current and the equal reduction of zero-sequence current, and setting value K gets 0.2.When comparator 51～53 positive input terminal signals 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 differential protection is braked, prevented the transformer differential protection malfunction; Otherwise comparator output 1 allows corresponding phase differential protection action.The advantage of this device is, in the time of can avoiding the threephase current transformer error inconsistent fully, and Y
0The transformer differential protection malfunction that lateral areas external ground fault causes, and the correct operation of differential protection under the zone of influence internal fault situation not.
Claims (3)
1. phase-splitting brake apparatus that utilizes fault component to prevent the transformer differential protection malfunction; it is characterized in that: this device is made of memory (11～14), subtracter (21～24), filter (31～34), multiplier (4), comparator (51～53), wherein the three-phase differential current instantaneous value signal (i of the positive input terminal of the input of memory (11～13) and subtracter (21～23) difference input transformer differential protection formation
Da, i
Db, i
Dc), the negative input end of subtracter (21～23) is connected with the output of memory (11～13) respectively, its output connects the input of filter (31～33) respectively, the output of filter (31～33) connects the positive input terminal of comparator (51～53) respectively, and the positive input terminal of the input of memory (14) and subtracter (24) is input transformer Y respectively
oSide zero-sequence current instantaneous value signal (3i
o), the negative input end of subtracter (24) connects the output of memory (14), the input of filter (34) is connected with the output of subtracter (24), an input of its output termination multiplier (4), another input input setting value (K) of multiplier (4), its output connects the negative input end of comparator (51～53) respectively, and comparator (51～53) is exported the brake signal of (A, B, C) phase respectively.
2. device 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 the equal reduction of zero-sequence current.
3 devices according to claim 1 is characterized in that: the characteristic of filter (31～34) should be consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162801A CN100413165C (en) | 2004-02-13 | 2004-02-13 | Phase-splitting brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162801A CN100413165C (en) | 2004-02-13 | 2004-02-13 | Phase-splitting brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558487A true CN1558487A (en) | 2004-12-29 |
| CN100413165C CN100413165C (en) | 2008-08-20 |
Family
ID=34351795
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100162801A Expired - Fee Related CN100413165C (en) | 2004-02-13 | 2004-02-13 | Phase-splitting brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100413165C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005014A (en) * | 2015-07-07 | 2015-10-28 | 南京国电南自电网自动化有限公司 | Merging unit with protection current transformer output abnormity detection function |
| CN105048424A (en) * | 2015-08-13 | 2015-11-11 | 中国电力科学研究院 | Power transmission line current differential protection starting component |
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 |
| CN2687917Y (en) * | 2004-02-13 | 2005-03-23 | 浙江大学 | Split-phase brake device for preventing transformer differential protection from being malfunction using failure component |
-
2004
- 2004-02-13 CN CNB2004100162801A patent/CN100413165C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105005014A (en) * | 2015-07-07 | 2015-10-28 | 南京国电南自电网自动化有限公司 | Merging unit with protection current transformer output abnormity detection function |
| CN105005014B (en) * | 2015-07-07 | 2017-11-21 | 南京国电南自电网自动化有限公司 | A kind of combining unit with protective current transformer output abnormality detection function |
| CN105048424A (en) * | 2015-08-13 | 2015-11-11 | 中国电力科学研究院 | Power transmission line current differential protection starting component |
| CN105048424B (en) * | 2015-08-13 | 2018-03-16 | 中国电力科学研究院 | A kind of transmission line of electricity current differential protection starting element |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100413165C (en) | 2008-08-20 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080820 Termination date: 20110213 |