CN100367607C - Transformer longitudinal error protecting element with zero sequence ratio brake - Google Patents
Transformer longitudinal error protecting element with zero sequence ratio brake Download PDFInfo
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- CN100367607C CN100367607C CNB2004100847654A CN200410084765A CN100367607C CN 100367607 C CN100367607 C CN 100367607C CN B2004100847654 A CNB2004100847654 A CN B2004100847654A CN 200410084765 A CN200410084765 A CN 200410084765A CN 100367607 C CN100367607 C CN 100367607C
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- 230000008676 import Effects 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 5
- 230000007257 malfunction Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 2
- 101100459998 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NDJ1 gene Proteins 0.000 description 1
- 101100205955 Schizosaccharomyces pombe (strain 972 / ATCC 24843) tam1 gene Proteins 0.000 description 1
- 101100424483 Schizosaccharomyces pombe (strain 972 / ATCC 24843) tam6 gene Proteins 0.000 description 1
- 101150028282 TMT-1 gene Proteins 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
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Abstract
The present invention discloses a longitudinal error protection element of a transformer with zero-sequence ratio brake. Three-phase brake current containing zero-sequence current is formed by the method that three-phase brake current representing through currents in the differential protection of the transformer carries out weighting summation respectively with zero-sequence current at the Y0 side of the transformer, and the three-phase current is used for forming a ratio brake element in a corresponding phase with three-phase differential current in the differential protection of the transformer respectively; and when the differential current is larger than the brake current containing zero sequence current, a ratio differential operation signal in a corresponding phase is output. When the proposal is applied, the mis-operation of the differential protection of the transformer because of a grounding fault outside a Y0 side zone can be completely avoided under the condition that errors of the three phases of current transformers are inconsistent; under the condition of other non internal faults, the mis-operation of the differential protection of the transformer resulting from differential unbalance current caused by zero-sequence current can be also avoided; and furthermore, the correct operation of the differential protection under the condition of faults in the zone can not be affected.
Description
Technical field
The present invention relates to a kind of relay protection of power system element, particularly a kind of transformer longitudinal error protecting element with the zero-sequence current ratio brake.
Background technology
Present Power Transformer Longitudinal Differential Protection is made of elements such as differential quick-break, percentage differential, magnetizing inrush current detection, overexcitation detections; according to the DL/T 684-1999 in People's Republic of China's power industry standard " the high-rating generator transformer relay protecting is adjusted and is calculated guide rule "; the transformer differential protection block diagram as shown in Figure 1, Differential Current Protection Principle wiring example is as shown in Figure 2.Usually utilize current transformer to Y
0The side three-phase current carries out the conversion of Y/ Δ, to eliminate the influence of zero-sequence current.Obviously, after the conversion, each electric current has not comprised the zero-sequence component in the primary current, these electric currents are behind intermediate current instrument transformer TAM1～TAM6 balancing, each phase current addition of the same name obtains the three-phase differential current, Wd is a differential coil, and phase current of the same name carries out the alternate manner combination and obtains the three-phase system streaming current, and Wres1～Wres3 is each side restraining coil.As seen, differential current that obtains thus and stalling current all do not comprise the zero-sequence component in the primary current.
When implementing longitudinal difference protection, also there is Y
0The side current transformer is the situation of complete star-like wiring, at this moment, often in protective device to Y
0Side three-phase secondary current carries out the conversion of Y/ Δ, perhaps with Y
0Side three-phase secondary current deducts zero-sequence current I respectively
0Simultaneously Δ side secondary current is carried out Δ/Y conversion, eliminate the influence of zero-sequence current by above-mentioned conversion.After these conversion, carry out differential current that balancing obtains with famous prime minister's addition again and do not comprise zero-sequence component in the primary current equally by the stalling current that other combination obtains.As: the vector by calculating phase current of the same name with obtain this differential current mutually; Maximum by asking for phase current of the same name or obtain this phase stalling current by the weighted sum of calculating phase current magnitude of the same name, its stalling current can only be represented the size of through current.
When transformer at Y
0Side generating region external ground fault and when having only this side that power supply is arranged, Y
0Very big zero-sequence fault electric current will appear in side, but the fault-free electric current passes through transformer.At this moment, work as Y
0When side threephase current transformer error was inconsistent, the zero-sequence current that equates at the primary side three-phase was after the threephase current transformer conversion, and secondary current is unequal, above-mentioned traditional Y
0Side three-phase current transform method can not be eliminated the influence of zero-sequence current fully, will produce unsymmetrical current at differential circuit.Because this moment, the fault-free electric current passed through transformer, the stalling current that obtains by above-mentioned conventional method is very little, can not surpass the preceding stalling current of fault, as long as differential unsymmetrical current surpasses differential threshold, transformer differential protection is with malfunction.Obviously, by Y
0Side zero-sequence fault electric current causes that unsymmetrical current has been left in the basket in the biased differential protection of traditional longitudinal difference protection, promptly do not have corresponding stalling current that it is braked in the percentage differential element, thereby make the transformer differential protection misoperation.
Summary of the invention
The technical problem to be solved in the present invention is to adopt Y at the transformer differential protection that exists in the prior art
0The method of side three-phase current conversion can not be eliminated the influence of zero-sequence current to second difference unbalance dynamic electric current fully; a kind of transformer longitudinal error protecting element with the zero-sequence current ratio brake is provided, the three-phase system streaming current by representing through current in the present transformer differential protection respectively with transformer Y
0The side zero-sequence current is weighted summation and constitutes the stalling current that three-phase contains zero-sequence current; the stalling current that contains zero-sequence current with this three-phase respectively with transformer differential protection in the three-phase differential current constitute corresponding phase ratio braking member; when differential current when containing the stalling current of zero-sequence current, export the percentage differential actuating signal of corresponding phase.Advantage of the present invention is, the ratio brake element of the band zero sequence amount that in transformer differential protection, induced one, and 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.
A kind of transformer longitudinal error protecting element with the zero-sequence current ratio brake is characterized in that: this element is by A phase multiplier A
1, B phase multiplier B
1, C phase multiplier C
1, first multiplier 01, A addition musical instruments used in a Buddhist or Taoist mass A
3, B addition musical instruments used in a Buddhist or Taoist mass B
3, C addition musical instruments used in a Buddhist or Taoist mass C
3, A phase comparator A
4, B phase comparator B
4With C phase comparator C
4Constitute; A phase multiplier A wherein
1, B phase multiplier B
1With C multiplier C mutually
1Input separately represent in the input transformer differential protection respectively through current through filtered A phase stalling current signal I
Za, B phase stalling current signal I
ZbWith C stalling current signal I mutually
Zc, its another input is separately all imported ratio brake coefficient K
Z, its output separately meets A addition musical instruments used in a Buddhist or Taoist mass A respectively
3, B addition musical instruments used in a Buddhist or Taoist mass B
3With C addition musical instruments used in a Buddhist or Taoist mass C
3An input separately; An input input transformer Y of first multiplier 01
0Side is through filtered zero sequence current signal 3I
0, its another input input zero-sequence braking COEFFICIENT K
0, its output meets A addition musical instruments used in a Buddhist or Taoist mass A respectively
3, B addition musical instruments used in a Buddhist or Taoist mass B
3With C addition musical instruments used in a Buddhist or Taoist mass C
3Another input separately; A phase comparator A
4, B phase comparator B
4With C phase comparator C
4Positive input terminal is separately imported respectively through filtered A phase differential current signal I
Da, B phase differential current signal I
DbWith C differential current signal I mutually
Dc, its negative input end separately respectively with A addition musical instruments used in a Buddhist or Taoist mass A
3, B addition musical instruments used in a Buddhist or Taoist mass B
3With C addition musical instruments used in a Buddhist or Taoist mass C
3Output separately is connected, A phase comparator A
4, B phase comparator B
4With C phase comparator C
4Output is separately exported A phase, B phase and C percentage differential actuating signal mutually respectively.
Ratio brake coefficient K
ZValue be 0＜K
Z＜1.Arrive under the situation of the same side the zero-sequence braking COEFFICIENT K at zero-sequence current and three-phase differential current, the reduction of three-phase system streaming current
0Value be 0＜K
0＜1/3.When differential current when containing the stalling current of zero-sequence current, comparator is exported the percentage differential actuating signal of corresponding phase.
With prior art relatively, the invention has the beneficial effects as follows and proposed first in the stalling current of the percentage differential element of traditional transformer differential protection, to add the zero-sequence braking electric current.Three-phase system streaming current by representing through current respectively with transformer Y
0The side zero-sequence current is weighted summation and constitutes the stalling current that three-phase contains zero-sequence current, the stalling current that contains zero-sequence current with this three-phase respectively with transformer differential protection in the three-phase differential current constitute corresponding phase ratio braking member.When differential current when containing the stalling current of zero-sequence current, export the percentage differential actuating signal of corresponding phase.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 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 existing transformer differential protection block diagram
Fig. 2 is existing transformer differential protection key wiring diagram
Fig. 3 is a kind of circuit block diagram of the transformer longitudinal error protecting element with the zero-sequence current ratio brake.
Embodiment
Embodiment 1:
A kind of transformer longitudinal error protecting element with the zero-sequence current ratio brake can be achieved by the circuit block diagram of Fig. 3.This element is by multiplier A
1, B
1, C
1, 01, adder A
3, B
3, C
3With comparator A
4, B
4, C
4Constitute.Multiplier A wherein
1, B
1, C
1Input respectively the through current of input transformer differential protection through filtered stalling current signal I
Za, I
Zb, I
Zc, another input input ratio brake coefficient K
Z=0.5, its output meets adder A respectively
3, B
3, C
3An input; Multiplier A
2, B
2, C
2Input input transformer Y respectively
0Side is through filtered zero sequence current signal 3I
0, another input is imported the zero-sequence braking COEFFICIENT K respectively
0=0.15, its output meets adder A respectively
3, B
3, C
3Another input, comparator A
4, B
4, C
4Positive input terminal import respectively through filtered three-phase differential current signal I
Da, I
Db, I
Dc, negative input end respectively with adder A
3, B
3, C
3Output be connected, its output is exported the percentage differential actuating signal of A, B, C phase respectively.When differential current when containing the stalling current of zero-sequence current, comparator is exported the percentage differential actuating signal of corresponding phase.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 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.
Claims (3)
1. transformer longitudinal error protecting element with the zero-sequence current ratio brake, it is characterized in that: this element is by A phase multiplier (A
1), B phase multiplier (B
1), C phase multiplier (C
1), first multiplier (01), A addition musical instruments used in a Buddhist or Taoist mass (A
3), B addition musical instruments used in a Buddhist or Taoist mass (B
3), C addition musical instruments used in a Buddhist or Taoist mass (C
3), A phase comparator (A
4), B phase comparator (B
4) and C phase comparator (C
4) constitute; A phase multiplier (A wherein
1), B phase multiplier (B
1) with C multiplier (C mutually
1) separately input represent in the input transformer differential protection respectively through current through filtered A phase stalling current signal I
Za, B phase stalling current signal I
ZbWith C stalling current signal I mutually
Zc, its another input is separately all imported ratio brake coefficient K
Z, its output separately meets A addition musical instruments used in a Buddhist or Taoist mass (A respectively
3), B addition musical instruments used in a Buddhist or Taoist mass (B
3) and C addition musical instruments used in a Buddhist or Taoist mass (C
3) separately an input; An input input transformer Y of first multiplier (01)
0Side is through filtered zero sequence current signal 3I
0, its another input input zero-sequence braking COEFFICIENT K
0, its output meets A addition musical instruments used in a Buddhist or Taoist mass (A respectively
3), B addition musical instruments used in a Buddhist or Taoist mass (B
3) and C addition musical instruments used in a Buddhist or Taoist mass (C
3) separately another input; A phase comparator (A
4), B phase comparator (B
4) and C phase comparator (C
4) separately positive input terminal imports respectively through filtered A phase differential current signal I
Da, B phase differential current signal I
DbWith C differential current signal I mutually
Dc, its negative input end separately respectively with A addition musical instruments used in a Buddhist or Taoist mass (A
3), B addition musical instruments used in a Buddhist or Taoist mass (B
3) and C addition musical instruments used in a Buddhist or Taoist mass (C
3) separately output is connected A phase comparator (A
4), B phase comparator (B
4) and C phase comparator (C
4) separately output exports A phase, B respectively mutually and C percentage differential actuating signal mutually.
2. element according to claim 1 is characterized in that: ratio brake coefficient K
ZValue be 0＜K
Z＜1.
3. element according to claim 1 is characterized in that: in zero-sequence current and three-phase differential current, the reduction of three-phase system streaming current under the situation of the same side, the zero-sequence braking COEFFICIENT K
0Value be 0＜K
0＜1/3.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100847654A CN100367607C (en) | 2004-12-02 | 2004-12-02 | Transformer longitudinal error protecting element with zero sequence ratio brake |
| PCT/CN2005/001492 WO2006058475A1 (en) | 2004-12-02 | 2005-09-19 | Transformer longitudinal difference protection method with zero-sequence ratio braking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100847654A CN100367607C (en) | 2004-12-02 | 2004-12-02 | Transformer longitudinal error protecting element with zero sequence ratio brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1783615A CN1783615A (en) | 2006-06-07 |
| CN100367607C true CN100367607C (en) | 2008-02-06 |
Family
ID=36773488
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100847654A Expired - Fee Related CN100367607C (en) | 2004-12-02 | 2004-12-02 | Transformer longitudinal error protecting element with zero sequence ratio brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100367607C (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141097A (en) * | 1994-01-06 | 1997-01-22 | 施耐德电器公司 | Device for differentially protecting a power transformer |
| US6356421B1 (en) * | 1999-11-29 | 2002-03-12 | Schweitzer Engineering Labs., Inc. | System for power transformer differential protection |
| CN1402400A (en) * | 2002-08-26 | 2003-03-12 | 南京南瑞继保电气有限公司 | Variable slope differential ratio protection method |
-
2004
- 2004-12-02 CN CNB2004100847654A patent/CN100367607C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1141097A (en) * | 1994-01-06 | 1997-01-22 | 施耐德电器公司 | Device for differentially protecting a power transformer |
| US6356421B1 (en) * | 1999-11-29 | 2002-03-12 | Schweitzer Engineering Labs., Inc. | System for power transformer differential protection |
| CN1402400A (en) * | 2002-08-26 | 2003-03-12 | 南京南瑞继保电气有限公司 | Variable slope differential ratio protection method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1783615A (en) | 2006-06-07 |
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| PB01 | Publication | ||
| 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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Granted publication date: 20080206 Termination date: 20101202 |