CN100367606C - Transformer longitudinal error protective method with multiple side zero sequence ratio brake - Google Patents
Transformer longitudinal error protective method with multiple side zero sequence ratio brake Download PDFInfo
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- CN100367606C CN100367606C CNB200410084764XA CN200410084764A CN100367606C CN 100367606 C CN100367606 C CN 100367606C CN B200410084764X A CNB200410084764X A CN B200410084764XA CN 200410084764 A CN200410084764 A CN 200410084764A CN 100367606 C CN100367606 C CN 100367606C
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- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000001681 protective effect Effects 0.000 title description 2
- 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 5
- 230000008676 import Effects 0.000 description 3
- 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
The present invention discloses a method for the longitudinal error protection of a transformer with multi-side 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 weighting summation value of the zero sequence current of the earthing side (or branch) of each neutral point in the transformer, and a brake element in the phase ratio is formed by the brake current containing zero sequence current and the differential current in a corresponding phase. When the differential current is larger than the brake current containing zero sequence current and is more than the minimum operation current, operation signals of the 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 the braking of multiple side zero sequence current ratio.
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 the braking of multiple side zero sequence current ratio is provided; the weighted sum value of the stalling current by representing through current in the transformer differential protection and the zero-sequence current of each neutral ground side (or branch) of transformer is weighted summation and constitutes the stalling current that contains zero-sequence current; constitute this phase ratio braking member with this stalling current that contains zero-sequence current with corresponding differential current mutually; when differential current during, export the actuating signal of this phase ratio braking member greater than 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 the braking of multiple side zero sequence current ratio; it is characterized in that: the weighted sum value 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 ground connection branch is weighted summation and constitutes the stalling current that contains zero-sequence current; constitute the criterion that this phase ratio is braked with this stalling current that contains zero-sequence current with corresponding differential current mutually; when differential current during greater than the stalling current that contains zero-sequence current and greater than minimum working current; export the actuating signal of this phase ratio braking, the operating criterion of band multiple side zero sequence current ratio braking is:
I
d＞K
Z×I
z+K
0×(3I
10×k
10+3I
20×k
20+……+3I
n0×k
n0)
I in the formula
d, I
zThe differential current that is respectively any phase in the transformer differential protection three-phase with represent this stalling current of through current mutually, 3I
10, 3I
20... 3I
N0Be the zero-sequence current of each neutral ground side or ground connection branch, k
10, k
20... k
N0Be the weights of setting, 3I
10* k
10+ 3I
20* k
20+ ... + 3I
N0* k
N0Be the weighted sum value of the zero-sequence current of each neutral ground side or ground connection branch, K
ZBe ratio brake coefficient, its value is 0＜K
Z＜1, K
0Be the zero-sequence braking coefficient, in zero-sequence current and three-phase differential current, the reduction of three-phase system streaming current to the same side and described each weights greater than 0 and be less than or equal under 1 the situation zero-sequence braking COEFFICIENT K
0Setting range is 0＜K
0＜1/3; N is transformer neutral point ground connection side number or ground connection branches.
With prior art relatively, the invention has the beneficial effects as follows and proposed first in the stalling current of the ratio brake element of traditional transformer longitudinal difference protection, to add the zero-sequence braking electric current.The weighted sum value of the stalling current by representing through current in the transformer differential protection and the zero-sequence current of each neutral ground side (or branch) of transformer is weighted summation and constitutes the stalling current that contains zero-sequence current; constitute this phase ratio braking member with this stalling current that contains zero-sequence current with corresponding differential current mutually; when differential current during, export the actuating signal of this phase ratio braking member greater than 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 circuit block diagram of a kind of transformer differential protection ratio brake element with the braking of multiple side zero sequence current ratio of the present invention
Fig. 4 is for realizing the circuit block diagram of the transformer differential protection ratio brake element that another kind of band multiple side zero sequence current ratio of the present invention is braked
Embodiment
Embodiment 1:
A kind of transformer longitudinal error protecting method, this method with multiple side zero sequence current ratio braking can be by Fig. 3 a kind of circuit block diagram of the transformer differential protection ratio brake element with the braking of multiple side zero sequence current ratio be achieved.This element is by multiplier A
1, B
1, C
1, M
1, 01,02,03, adder A
3, B
3, C
3, M
0, and comparator A
4, B
4, C
4Constitute.Multiplier A wherein
1, B
1, C
1Input represent in the input transformer differential protection respectively through current through filtered three-phase system streaming current signal I
Za, I
Zb, I
Zc, its another input input ratio brake coefficient K
Z=0.4; Each neutral ground side (or branch) of input difference input transformer of multiplier 01,02,03 is through filtered zero sequence current signal 3I
10, 3I
20, 3I
30, another input is imported predefined weights k respectively
10, k
20, k
30, value is 0.4, its output meets adder M respectively
0Three inputs; Adder M
0Output and multiplier M
1An input be connected; Multiplier M
1Another input input setting value K
0=0.2, its output meets adder A respectively
3, B
3, C
3An input; Adder A
3, B
3, C
3Another input meet multiplier A respectively
1, B
1, C
1Output, its output respectively with comparator A
4, B
4, C
4Negative input end be connected; Comparator A
4, B
4, C
4Positive input terminal import respectively through filtered three-phase differential current signal I
Da, I
Db, I
Dc, its output is exported the percentage differential actuating signal of A, B, C phase respectively.N=3 is a transformer neutral point ground connection side number (or branches).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.
Embodiment 2:
A kind of transformer longitudinal error protecting method, this method with multiple side zero sequence current ratio braking can be by Fig. 4 the circuit block diagram of transformer differential protection ratio brake element of another kind band multiple side zero sequence current ratio braking be achieved.This element is by subtracter A
11, B
12, C
13, multiplier A
21, B
22, C
23, 011,021,031, M
4, adder A
31, B
32, C
33, A
41, B
42, C
43, M
3With comparator A
51, B
52, C
53Constitute.Subtracter A wherein
11, B
12, C
13Positive input terminal respectively the input transformer longitudinal difference protection the representative through current through filtered stalling current signal I
Za, I
Zb, I
Zc, the braking keen current value I in the negative input end difference input transformer longitudinal difference protection
Reso=1.2 * I
n, I
nFor converting the transformer rated current of this side; Multiplier A
21, B
22, C
23An input meet subtracter A respectively
11, B
12, C
13Output, another input is imported percentage differential broken line slope S=0.5 respectively, its output meets adder A respectively
31, B
32, C
33An input; Adder A
31, B
32, C
33Another input import minimum working current value I respectively
Op.min=0.4 * I
n, its output respectively with adder A
41, B
42, C
43An input be connected; Each neutral ground side (or branch) of input difference input transformer of multiplier 011,021,031 is through filtered zero sequence current signal 3I
10, 3I
20, 3I
30, another input is imported predefined weights k respectively
10, k
20, k
30, value is 0.3, its output termination adder M
3Three inputs; Adder M
3Output termination multiplier M
4An input, multiplier M
4Another input input zero-sequence braking COEFFICIENT K
0Be 0.3.Multiplier M
4Output respectively with adder A
41, B
42, C
43Another input be connected; Comparator A
51, B
52, C
53Positive input terminal import respectively through filtered three-phase differential current signal I
Da, I
Db, I
Dc, negative input end respectively with adder A
41, B
42, C
43Output be connected, its output is exported the percentage differential actuating signal of A, B, C phase respectively.N=3 is a transformer neutral point ground connection side number (or branches).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, can realize the only situation of initial point of percentage differential broken line, i.e. ratio brake coefficient Kz=S * (1-I
Reso/ Iz)+I
Op.min/ Iz, ratio brake coefficient Kz changes with stalling current; In the time of also 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 multiple side zero sequence current ratio braking; it is characterized in that: the weighted sum value 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 ground connection branch is weighted summation and constitutes the stalling current that contains zero-sequence current; constitute the criterion that this phase ratio is braked with this stalling current that contains zero-sequence current with corresponding differential current mutually; when differential current during greater than the stalling current that contains zero-sequence current and greater than minimum working current; export the actuating signal of this phase ratio braking, the operating criterion of band multiple side zero sequence current ratio braking is:
I
d＞K
Z×I
z+K
0×(3I
10×k
10+3I
20×k
20+……+3I
n0×k
n0)
I in the formula
d, I
zThe differential current that is respectively any phase in the transformer differential protection three-phase with represent this stalling current of through current mutually, 3I
10, 3I
20... 3I
N0Be the zero-sequence current of each neutral ground side or ground connection branch, k
10, k
20... k
N0Be the weights of setting, 3I
10* k
10+ 3I
20* k
20+ ... + 3I
N0* k
N0Be the weighted sum value of the zero-sequence current of each neutral ground side or ground connection branch, K
ZBe ratio brake coefficient, K
0Be the zero-sequence braking coefficient, n is transformer neutral point ground connection side number or ground connection branches.
2. method according to claim 1 is characterized in that: ratio brake coefficient K
ZValue be 0＜K
Z＜1.
3. 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 to the same side and described each weights greater than 0 and be less than or equal under 1 the situation zero-sequence braking COEFFICIENT K
0Setting range is 0＜K
0＜1/3.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410084764XA CN100367606C (en) | 2004-12-02 | 2004-12-02 | Transformer longitudinal error protective method with multiple side 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 |
|---|---|---|---|
| CNB200410084764XA CN100367606C (en) | 2004-12-02 | 2004-12-02 | Transformer longitudinal error protective method with multiple side zero sequence ratio brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1783614A CN1783614A (en) | 2006-06-07 |
| CN100367606C true CN100367606C (en) | 2008-02-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200410084764XA Expired - Fee Related CN100367606C (en) | 2004-12-02 | 2004-12-02 | Transformer longitudinal error protective method with multiple side zero sequence ratio brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100367606C (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 CNB200410084764XA patent/CN100367606C/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 |
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| Publication number | Publication date |
|---|---|
| CN1783614A (en) | 2006-06-07 |
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Assignee: SANBIAN SCI-TECH Co.,Ltd. Assignor: Zhejiang University Contract record no.: 2011330000100 Denomination of invention: Transformer longitudinal error protective method with multiple side zero sequence ratio brake Granted publication date: 20080206 License type: Exclusive License Open date: 20060607 Record date: 20110316 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080206 |
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