CN100367611C - Transformer Longitudinal Differential Protection Method with Maximum Zero-sequence Current Fault Component Ratio Braking - Google Patents
Transformer Longitudinal Differential Protection Method with Maximum Zero-sequence Current Fault Component Ratio Braking Download PDFInfo
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- CN100367611C CN100367611C CNB2004100890014A CN200410089001A CN100367611C CN 100367611 C CN100367611 C CN 100367611C CN B2004100890014 A CNB2004100890014 A CN B2004100890014A CN 200410089001 A CN200410089001 A CN 200410089001A CN 100367611 C CN100367611 C CN 100367611C
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000007935 neutral effect Effects 0.000 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
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Abstract
本发明公开了一种带最大零序电流故障分量比率制动的变压器纵差保护方法，通过变压器纵差保护中代表穿越电流的制动电流的故障分量与变压器各中性点接地侧或分支的零序电流的故障分量中的最大值进行加权求和构成含零序电流的制动电流故障分量，用该含零序电流的制动电流与相应相的差动电流的故障分量构成此相的故障分量比率制动判据。当差动电流的故障分量大于含零序电流的制动电流故障分量且大于最小动作电流时，输出该相的故障分量比率制动元件的动作信号。应用本方案，可完全避免三相电流互感器误差不一致时，Y0侧区外接地故障导致的变压器差动保护误动。
The invention discloses a transformer longitudinal differential protection method with maximum zero-sequence current fault component ratio braking, through the fault component of the braking current representing the through current in the transformer longitudinal differential protection and the grounding side or branch of each neutral point of the transformer. The maximum value of the fault components of the zero-sequence current is weighted and summed to form the braking current fault component containing zero-sequence current, and the braking current containing zero-sequence current and the fault component of the differential current of the corresponding phase are used to form the fault component of this phase Fault component ratio braking criterion. When the fault component of the differential current is greater than the fault component of the braking current containing the zero-sequence current and greater than the minimum operating current, the action signal of the braking component of the fault component ratio of this phase is output. The application of this scheme can completely avoid the misoperation of the transformer differential protection caused by the ground fault outside the zone on the Y 0 side when the errors of the three-phase current transformers 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 maximum 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 and 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; a kind of transformer longitudinal error protecting method with maximum zero sequence current fault component ratio brake is provided; maximum in the fault component of the fault component of the stalling current by representing through current in the transformer differential protection and the zero-sequence current of each neutral ground side of transformer or branch is weighted the fault component that summation constitutes the stalling current that contains the zero-sequence current fault component; constitute the criterion of the fault component ratio brake of this phase with this fault component and fault component of corresponding differential current mutually that contains the stalling current of zero-sequence current fault component; when the fault component of differential current during, export the actuating signal of the fault component ratio brake element of this phase greater than the fault component of the stalling current that contains the zero-sequence current fault component 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 maximum zero sequence current fault component ratio brake, it is characterized in that: the maximum in the fault component of the fault component of the stalling current by representing through current in the transformer differential protection and the zero-sequence current of each neutral ground side of transformer or each neutral ground branch of transformer is weighted the fault component that summation constitutes the stalling current that contains the maximum zero sequence current fault component, constitute the criterion of the fault component ratio brake of this phase with this fault component and fault component of corresponding differential current mutually that contains the stalling current of maximum zero sequence current fault component, when the fault component of differential current during, export the actuating signal of the fault component ratio brake of this phase greater than the fault component of the stalling current that contains the maximum zero sequence current fault component and greater than minimum working current; The operating criterion of described fault component ratio brake is:
ΔI
d＞K
Z*ΔI
z+K
0*(Δ3I
10、Δ3I
20、……Δ3I
no)max
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
10, Δ 3I
20... Δ 3I
NoBe the fault component of the zero-sequence current of each neutral ground side of transformer or each neutral ground branch of transformer, (3I
10, 3I
20... 3I
No) max is the maximum in each zero-sequence current fault component, K
ZBe ratio brake coefficient, K
0Be the zero-sequence braking coefficient, n is transformer neutral point ground connection side number or branches, arrives 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, ratio brake coefficient K
ZSetting range is 0＜K
Z＜0.8.
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.Maximum in the fault component of the fault component of the stalling current by representing through current in the transformer differential protection and the zero-sequence current of each neutral ground side of transformer or branch is weighted the fault component that summation constitutes the stalling current that contains zero-sequence current, constitute the fault component ratio brake criterion 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 the fault component ratio brake element of this phase 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 situations; 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 maximum 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 maximum 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 maximum 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 maximum 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 maximum 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, 011,012,013, subtracter A
21, B
21, C
21, A
22, B
22, C
22, 021,022,023, filter A
31, B
31, C
31, A
32, B
32, C
32, 031,032,033, maximizing circuit 041, multiplier A
41, B
41, C
41, 042, 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 three-phase system streaming current instantaneous value signal i of the representative through current in the 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 011,012,013 and subtracter 021,022,023 is input transformer Y respectively
0The zero-sequence current instantaneous value signal 3i of side
10, 3i
20, 3i
30N=3 is a transformer neutral point ground connection side number (or branches), the negative input end of the output termination subtracter 021,022,023 of memory 011,012,013, the output of subtracter 021,022,023 is connected with the input of filter 031,032,033 respectively, the output of filter 031,032,033 connects the input of maximizing circuit 041 respectively, and the output of maximizing circuit 041 is connected with an input of multiplier 042; Another input input zero-sequence braking COEFFICIENT K of multiplier 042
0=0.2, its output meets adder A respectively
42, B
42, C
42An input; Filter A
32, B
32, C
32Output meet multiplier A respectively
41, B
41, C
41An input, multiplier A
41, B
41, C
41Another input import ratio brake coefficient K in the existing biased differential protection respectively
Z, value is 0＜K
Z＜0.8, its output meets adder A respectively
42, B
42, C
42Another input; Adder A
42, B
42, C
42Output respectively with comparator A
5, B
5, C
5Negative input end be connected filter A
31, B
31, C
31Output meet comparator A respectively
5, B
5, C
5Positive input terminal, comparator A
5, B
5, C
5Output export the percentage differential actuating signal of A, B, C phase respectively.When the differential current fault component when containing the stalling current fault component 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 longitudinal difference protection under the zone of influence internal fault situation not.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100890014A CN100367611C (en) | 2004-12-02 | 2004-12-02 | Transformer Longitudinal Differential Protection Method with Maximum Zero-sequence Current Fault Component Ratio Braking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100890014A CN100367611C (en) | 2004-12-02 | 2004-12-02 | Transformer Longitudinal Differential Protection Method with Maximum Zero-sequence Current Fault Component Ratio Braking |
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| Publication Number | Publication Date |
|---|---|
| CN1783619A CN1783619A (en) | 2006-06-07 |
| CN100367611C true CN100367611C (en) | 2008-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100890014A Expired - Fee Related CN100367611C (en) | 2004-12-02 | 2004-12-02 | Transformer Longitudinal Differential Protection Method with Maximum Zero-sequence Current Fault Component Ratio Braking |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112310941B (en) * | 2020-11-04 | 2022-09-16 | 上海思源弘瑞自动化有限公司 | Brake current determination method, brake current determination device, computer equipment and readable storage medium |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047887C (en) * | 1994-01-06 | 1999-12-29 | 施耐德电器公司 | Device for differentially protecting a power transformer |
| 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 CNB2004100890014A patent/CN100367611C/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047887C (en) * | 1994-01-06 | 1999-12-29 | 施耐德电器公司 | Device for differentially protecting a power transformer |
| 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 |
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| Publication number | Publication date |
|---|---|
| CN1783619A (en) | 2006-06-07 |
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Granted publication date: 20080206 Termination date: 20101202 |