CN100367610C - Fault component transformer longitudinal error protecting method with zero sequence ratio brake - Google Patents
Fault component transformer longitudinal error protecting method with zero sequence ratio brake Download PDFInfo
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- CN100367610C CN100367610C CNB2004100847758A CN200410084775A CN100367610C CN 100367610 C CN100367610 C CN 100367610C CN B2004100847758 A CNB2004100847758 A CN B2004100847758A CN 200410084775 A CN200410084775 A CN 200410084775A CN 100367610 C CN100367610 C CN 100367610C
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- 238000000034 method Methods 0.000 title claims abstract description 15
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 7
- 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 method of longitudinal error protection for a fault weight transformer with zero-sequence ratio brake. Brake current containing zero sequence current is formed by the method that the brake current representing through current in the longitudinal error protection of the transformer carries out weighting summation with the fault weight of the zero sequence current at the Y0 side of the transformer, and a ratio brake element of fault weight in the phase ratio is formed from the fault weight of the brake current containing zero sequence current and the fault weight of the differential current in a corresponding phase. When the fault weight of the differential current is larger than the fault weight the brake current containing zero sequence current and is more than the minimum operation current, operation signals of the ratio brake element in the phase ratio are output. When the proposal is applied, the unwanted operation of the longitudinal error protection of the transformer because of the earthing fault outside a Y0 side region can be completely avoided under the condition that errors of a three-phase current transformer are inconsistent.
Description
Technical field
The present invention relates to a kind of relay protection method of power system, particularly a kind of transformer longitudinal error protecting method with zero-sequence current fault component 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 respectively, simultaneously Δ side secondary current is carried out Δ/Y conversion, eliminates the influence of zero-sequence current by above-mentioned conversion.By these conversion and behind each side balancing, the stalling current that obtains by the differential current that obtains with famous prime minister's addition and by other combination does not comprise the zero-sequence component in the primary current equally.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 ratio brake element of traditional longitudinal difference protection, promptly do not have corresponding stalling current that it is braked in the ratio brake element, thereby may cause the transformer differential protection misoperation.
Summary of the invention
The technical problem to be solved in the present invention is the Y that exists in the existing transformer differential protection technology
0Side three-phase current transform method can not be eliminated the influence of zero-sequence current fully; provide a kind of transformer longitudinal error protecting method, the fault component and the transformer Y of the stalling current by representing through current in the transformer differential protection with zero-sequence current fault component ratio brake
0The fault component of side zero-sequence current is weighted the fault component that summation constitutes the stalling current that contains zero-sequence current, constitute the fault component ratio brake element of this phase with this fault component and fault component of corresponding differential current mutually that contains the stalling current of zero-sequence current, when the fault component of differential current during, export the actuating signal of this phase ratio braking member greater than the fault component of the stalling current that contains zero-sequence current and greater than minimum working current.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.
A kind of transformer longitudinal error protecting method with zero-sequence current fault component ratio brake is characterized in that: the fault component and the transformer Y of the stalling current by representing through current in the transformer differential protection
0The fault component of side zero-sequence current is weighted the fault component that summation constitutes the stalling current of the fault component that contains zero-sequence current, constitute the criterion of the fault component ratio brake of this phase with this fault component and fault component of corresponding differential current mutually of stalling current that contains the fault component of zero-sequence current, when the fault component of differential current during greater than the fault component of the stalling current of the fault component that contains zero-sequence current and greater than minimum working current, export the actuating signal of this phase fault component ratio braking, the operating criterion of band zero-sequence current fault component ratio brake is:
ΔI
d＞K
Z×ΔI
z+K
0×Δ3I
0
Δ I in the formula
d, Δ I
zThe fault component that is respectively the differential current of any phase in the transformer differential protection three-phase with represent this fault component of the stalling current of through current mutually, Δ 3I
0Be Y
0The fault component of side zero-sequence current, K
ZBe ratio brake coefficient, setting range is 0＜K
Z＜0.8, 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
0Setting range is 0＜K
0＜1/3.
With prior art relatively, the invention has the beneficial effects as follows and proposed first in the stalling current of the fault component ratio brake element of traditional transformer longitudinal difference protection, to add the zero-sequence braking electric current.The fault component and the transformer Y of the stalling current by representing through current in the transformer differential protection
0The fault component of side zero-sequence current is weighted the fault component that summation constitutes the stalling current that contains zero-sequence current, constitute the fault component ratio brake element of this phase with this fault component and fault component of corresponding differential current mutually that contains the stalling current of zero-sequence current, when the fault component of differential current during, export the actuating signal of this phase ratio braking member greater than the fault component of the stalling current that contains zero-sequence current and greater than minimum working current.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 longitudinal difference protection under the zone of influence internal fault situation not.
Description of drawings
Below in conjunction with accompanying drawing to the specific embodiment of the present invention further detailed description.
Fig. 1 is existing transformer differential protection block diagram.
Fig. 2 is existing transformer differential protection key wiring diagram.
Fig. 3 is for realizing the A circuitry phase block diagram of a kind of transformer longitudinal error protecting element with zero-sequence current fault component ratio brake of the present invention.
Fig. 4 is for realizing the B circuitry phase block diagram of a kind of transformer longitudinal error protecting element with zero-sequence current fault component ratio brake of the present invention.
Fig. 5 is for realizing the C circuitry phase block diagram of a kind of transformer longitudinal error protecting element with zero-sequence current fault component ratio brake of the present invention.
Embodiment
Embodiment 1:
A kind of transformer longitudinal error protecting method, this method with zero-sequence current fault component ratio brake can be by Fig. 3～Fig. 5 a kind of circuit block diagram of the transformer longitudinal error protecting element with zero-sequence current fault component ratio brake be achieved.This element is by memory A
11, B
11, C
11, A
12, B
12, C
12, O1, subtracter A
21, B
21, C
21, A
22, B
22, C
22, O2, filter A
31, B
31, C
31, A
32, B
32, C
32, O3, multiplier A
41, B
41, C
41, O4, adder A
42, B
42, C
42With comparator A
5, B
5, C
5Constitute.Memory A wherein
11, B
11, C
11Input and subtracter A
21, B
21, C
21Positive input terminal input transformer Y respectively
0The three-phase differential current instantaneous value signal i of side
Da, i
Db, i
Dc, memory A
11, B
11, C
11Output meet subtracter A respectively
21, B
21, C
21Negative input end, subtracter A
21, B
21, C
21Output meet filter A respectively
31, B
31, C
31Input; Memory A
12, B
12, C
12Input and subtracter A
22, B
22, C
22The positive input terminal stalling current instantaneous value signal i of the representative through current of input transformer longitudinal difference protection respectively
Za, i
Zb, i
Zc, memory A
12, B
12, C
12Output meet subtracter A respectively
22, B
22, C
22Negative input end, subtracter A
22, B
22, C
22Output meet filter A respectively
32, B
32, C
32Input; The positive input terminal of the input of memory O1 and subtracter O2 is input transformer Y respectively
0The zero-sequence current instantaneous value signal 3i of side
o, the negative input end of the output termination subtracter O2 of memory O1, the output of subtracter O2 is connected with the input of filter O3, the input of the output termination multiplier O4 of filter O3; Another input input zero-sequence braking COEFFICIENT K of multiplier O4
0=0.2, its output meets adder A respectively
42, B
42, C
42An input; Multiplier A
41, B
41, C
41An input meet filter A respectively
32, B
32, C
32Output, another input is imported ratio brake coefficient K respectively
ZBe 0＜K
Z＜0.8; Adder A
42, B
42, C
42Another input respectively with multiplier A
41, B
41, C
41Output be connected, its output meets comparator A respectively
5, B
5, C
5Negative input end; Comparator A
5, B
5, C
5Positive input terminal respectively with filter A
31, B
31, C
31Output be connected, its output is exported the percentage differential actuating signal of A, B, C phase respectively.When the positive input terminal signal of comparator during greater than the negative input end signal, comparator is exported the percentage differential actuating signal of corresponding phase.Use this programme, the stalling current fault component that contains zero-sequence current with three-phase respectively with transformer differential protection in three-phase differential current fault component constitute corresponding phase ratio braking member, 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 vertical poor unsymmetrical current that zero-sequence current causes causes, and the correct operation of longitudinal difference protection under the zone of influence internal fault situation not.
Claims (3)
1. transformer longitudinal error protecting method with zero-sequence current fault component ratio brake is characterized in that: the fault component and the transformer Y of the stalling current by representing through current in the transformer differential protection
0The fault component of side zero-sequence current is weighted the fault component that summation constitutes the stalling current of the fault component that contains zero-sequence current, constitute the criterion of the fault component ratio brake of this phase with this fault component and fault component of corresponding differential current mutually of stalling current that contains the fault component of zero-sequence current, when the fault component of differential current during greater than the fault component of the stalling current of the fault component that contains zero-sequence current and greater than minimum working current, export the actuating signal of this phase fault component ratio braking, the operating criterion of band zero-sequence current fault component ratio brake is:
ΔI
d＞K
Z×ΔI
z+K
0×Δ3I
0
Δ I in the formula
d, Δ I
zThe fault component that is respectively the differential current of any phase in the transformer differential protection three-phase with represent this fault component of the stalling current of through current mutually, Δ 3I
0Be Y
0The fault component of side zero-sequence current, K
ZBe ratio brake coefficient, K
0Be the zero-sequence braking coefficient.
2. method 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
0Setting range is 0＜K
0＜1/3.
3. method according to claim 1 is characterized in that: ratio brake coefficient K
ZSetting range is 0＜K
Z＜0.8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100847758A CN100367610C (en) | 2004-12-02 | 2004-12-02 | Fault component transformer longitudinal error protecting method with zero sequence ratio brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100847758A CN100367610C (en) | 2004-12-02 | 2004-12-02 | Fault component transformer longitudinal error protecting method with zero sequence ratio brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1783618A CN1783618A (en) | 2006-06-07 |
| CN100367610C true CN100367610C (en) | 2008-02-06 |
Family
ID=36773491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100847758A Expired - Fee Related CN100367610C (en) | 2004-12-02 | 2004-12-02 | Fault component transformer longitudinal error protecting method with zero sequence ratio brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100367610C (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 CNB2004100847758A patent/CN100367610C/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 |
|---|---|
| CN1783618A (en) | 2006-06-07 |
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Granted publication date: 20080206 Termination date: 20101202 |