CN1783616A - Transformer longitudinal error protecting element with maximum zero sequence ratio brake - Google Patents
Transformer longitudinal error protecting element with maximum zero sequence ratio brake Download PDFInfo
- Publication number
- CN1783616A CN1783616A CN 200410084766 CN200410084766A CN1783616A CN 1783616 A CN1783616 A CN 1783616A CN 200410084766 CN200410084766 CN 200410084766 CN 200410084766 A CN200410084766 A CN 200410084766A CN 1783616 A CN1783616 A CN 1783616A
- Authority
- CN
- China
- Prior art keywords
- current
- input
- zero
- transformer
- differential
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000007935 neutral effect Effects 0.000 claims abstract description 8
- 230000008676 import Effects 0.000 claims description 2
- 230000009699 differential effect Effects 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 7
- 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
- 238000007796 conventional method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
- Protection Of Transformers (AREA)
Abstract
This invention discloses a longitudinal deviation protection element for a transformer with the largest side zero-sequence rate brake, which carries out weight and sum of three phase brake currents representing the through current in the differential protection of the present transformers with the maximum value in the zero sequence current of the earth side of each neutral point to get brake currents of three phases containing the zero sequence current to be used to get rate brake elements of related phases with the three phase differential currents, when the differential current is greater than the brake current containing the zero sequence current, a rate differential action signal of a related phase is output.
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 maximum side zero sequence 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 certain Y
0Side generation external area error and when having only this side that power supply is arranged, this Y
0Very big zero-sequence fault electric current will appear in side, but the fault-free electric current passes through transformer.At this moment, as this 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.As seen, by Y
0Side zero-sequence fault electric current causes that unsymmetrical current has been left in the basket in traditional biased differential protection.
Summary of the invention
The object of the present invention is to provide a kind of transformer longitudinal error protecting element with maximum side zero sequence ratio brake; three-phase system streaming current by representing through current in the present transformer differential protection respectively with the zero-sequence current of each neutral ground side (or branch) in maximum be weighted summation and constitute the stalling current that three-phase contains zero-sequence current; with this stalling current that contains zero-sequence current 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, 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 element with maximum side zero sequence ratio brake comprises maximizing circuit, multiplier, adder, comparator; It is characterized in that: this element is by maximizing circuit 01, multiplier A
1, B
1, C
1, 02, adder A
3, B
3, C
3With comparator A
4, B
4, C
4Constitute; Wherein each neutral ground side (or branch) of the input of maximizing circuit 01 difference input transformer is through filtered zero sequence current signal 3I
10, 3I
20... 3I
No, its output is connected with an input of multiplier 02; Another input input zero-sequence braking COEFFICIENT K of multiplier 02
0, its output meets adder A respectively
3, B
3, C
3An input; Multiplier A
1, B
1, C
1Input represent through current through filtered three-phase system streaming current signal I in the input transformer differential protection respectively
Za, I
Zb, I
Zc, its another input input ratio brake coefficient K
ZAdder 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 is a transformer neutral point ground connection side number (or branches), the ratio brake coefficient K in the existing biased differential protection
ZBe 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
0Be 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, advantage of the present invention is to have proposed first to add the zero-sequence braking electric current in the stalling current of the percentage differential element of traditional transformer differential protection.Three-phase system streaming current by representing through current respectively with the zero-sequence current of each neutral ground side (or branch) in maximum be weighted summation and constitute the stalling current that three-phase contains zero-sequence current; with this stalling current that contains zero-sequence current 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, with the Y of unique power supply
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
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 a kind of circuit block diagram of the transformer longitudinal error protecting element with maximum side zero sequence ratio brake
Embodiment
Embodiment 1:
A kind of transformer longitudinal error protecting element with maximum side zero sequence ratio brake can be achieved by the circuit block diagram of Fig. 3.This element is by maximizing circuit 01, multiplier A
1, B
1, C
1, 02, adder A
3, B
3, C
3With comparator A
4, B
4, C
4Constitute.Wherein n=3 is a transformer neutral point ground connection side number (or branches), the ratio brake coefficient K in the existing biased differential protection
ZBe 0.5, the zero-sequence braking COEFFICIENT K
0Be 0.3.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, with the Y of unique power supply
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.
Claims (3)
1. the transformer longitudinal error protecting element with maximum side zero sequence ratio brake comprises maximizing circuit, multiplier, adder, comparator; It is characterized in that: this element is by maximizing circuit (01), multiplier (A
1, B
1, C
1, 02), adder (A
3, B
3, C
3) and comparator (A
4, B
4, C
4) constitute; Wherein each neutral ground side (or branch) of the input of maximizing circuit (01) difference input transformer is through filtered zero sequence current signal (3I
10, 3I
20... 3I
No), its output is connected with an input of multiplier (02); Another input input zero-sequence braking coefficient (K of multiplier (02)
0), its output meets adder (A respectively
3, B
3, C
3) an input; Multiplier (A
1, B
1, C
1) input represent through current through filtered three-phase system streaming current signal (I in the input transformer differential protection respectively
Za, I
Zb, I
Zc), its another input input ratio brake coefficient (K
Z); Adder (A
3, B
3, C
3) another input meet multiplier (A respectively
1, B
1, C
1) output, its output respectively with comparator (A
4, B
4, C
4) negative input end be connected; Comparator (A
4, B
4, C
4) positive 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; (K
Z) for having the ratio brake coefficient in the biased differential protection, (K now
0) be the zero-sequence braking coefficient, (n) be transformer neutral point ground connection side number (or branches).
2. a kind of transformer longitudinal error protecting element with maximum side zero sequence ratio brake according to claim 1 is characterized in that: the ratio brake coefficient (K in the existing biased differential protection
Z), its value is 0＜K
Z＜1.
3. a kind of transformer longitudinal error protecting element with maximum side zero sequence ratio brake 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, zero-sequence braking coefficient (K
0) be 0＜K
0＜1/3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100847669A CN100367608C (en) | 2004-12-02 | 2004-12-02 | Transformer longitudinal error protecting element with maximum zero sequence ratio brake |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100847669A CN100367608C (en) | 2004-12-02 | 2004-12-02 | Transformer longitudinal error protecting element with maximum zero sequence ratio brake |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1783616A true CN1783616A (en) | 2006-06-07 |
| CN100367608C CN100367608C (en) | 2008-02-06 |
Family
ID=36773489
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100847669A Expired - Fee Related CN100367608C (en) | 2004-12-02 | 2004-12-02 | Transformer longitudinal error protecting element with maximum zero sequence ratio brake |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100367608C (en) |
Family Cites Families (3)
| 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 |
-
2004
- 2004-12-02 CN CNB2004100847669A patent/CN100367608C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN100367608C (en) | 2008-02-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100367605C (en) | Transformer longitudinal error protecting method with maximum side zero sequence ratio brake | |
| CN100367608C (en) | Transformer longitudinal error protecting element with maximum zero sequence ratio brake | |
| CN1783623A (en) | Fault component transformer longitudinal error protecting element with multiple side zero sequence ratio brake | |
| CN100367611C (en) | Tault component transformer longitudinal error protecting method with maximum side zero sequence ratio brake | |
| CN1783622A (en) | Fault component transformer longitudinal protecting element with maximum side zero sequence ratio brake | |
| CN100394658C (en) | Transformer longitudinal error protective element with zero sequence ratio brake | |
| CN1783625A (en) | Transformer longitudinal error protecting element with maximum side zero sequence ratio brake | |
| CN100367606C (en) | Transformer longitudinal error protective method with multiple side zero sequence ratio brake | |
| CN1783617A (en) | Transformer longitudinal error protecting element with multiple side zero sequence ratio brake | |
| CN100367607C (en) | Transformer longitudinal error protecting element with zero sequence ratio brake | |
| CN1783626A (en) | Transformer longitudinal error protecting element with multiple side zero sequence ratio brake | |
| CN100367610C (en) | Fault component transformer longitudinal error protecting method with zero sequence ratio brake | |
| CN100377462C (en) | Fault component transformer longitudinal error protecting method with multiple side zero soquence ratio brake | |
| CN100367604C (en) | Transformer longitudinal error protecting method with zero sequence ratio brake | |
| CN1783621A (en) | Fault component transformer longitudinal error protecting element with zero sequence ratio brake | |
| CN100433487C (en) | Phase-splitting integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation | |
| CN2689558Y (en) | Maximum differential comprehensive braker for preventing multi-branch transformer differential protector from malfunction | |
| CN2689560Y (en) | Negative sequential differential flow comprehensive braker for preventing multi-branch transformer differential protector from malfunction | |
| CN100367599C (en) | Positive sequence differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation | |
| CN2689559Y (en) | Positive sequential differential flow comprehensive braker for preventing multi-branch transformer differential protector from malfunction | |
| CN2689557Y (en) | Split-phase comprehensive apparatus for preventing multi-branch transformer differential protector from malfunction | |
| CN2687920Y (en) | Three-phase comprehensive brakedevice for preventing multi-branch transformer differential protection from being malfunction | |
| CN100413166C (en) | Maximum differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation | |
| CN100350697C (en) | Negative sequence differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation | |
| CN100388580C (en) | Three-phase integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| 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 | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080206 Termination date: 20101202 |