CN2689560Y - Negative sequential differential flow comprehensive braker for preventing multi-branch transformer differential protector from malfunction - Google Patents
Negative sequential differential flow comprehensive braker for preventing multi-branch transformer differential protector from malfunction Download PDFInfo
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- CN2689560Y CN2689560Y CN 200420020126 CN200420020126U CN2689560Y CN 2689560 Y CN2689560 Y CN 2689560Y CN 200420020126 CN200420020126 CN 200420020126 CN 200420020126 U CN200420020126 U CN 200420020126U CN 2689560 Y CN2689560 Y CN 2689560Y
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- multiplier
- comparator
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- 230000007257 malfunction Effects 0.000 title claims description 13
- 230000001012 protector Effects 0.000 title 1
- 230000007935 neutral effect Effects 0.000 claims abstract description 14
- 238000000819 phase cycle Methods 0.000 claims description 7
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model relates to a negative sequence differential flow comprehensive braking device for preventing a multi-branch transformer differential protection device from false action. The device comprises a ratio braking element which is formed by the weighting summation value of the negative sequence current of the base wave of the three-phase differential current acquired from a transformer differential protection device and the zero sequence current of every neutral point grounding side (or branch). When the ratio value is smaller than the set value K, a comparator 6 outputs 0. The condition is judged as an outer region grounding fault, and a three-phase ratio differential protecting main outlet is closed. Otherwise, the comparator 6 outputs 1 and permits the three-phase differential protection device to carry out action. The utility model has the advantage that the utility model can completely avoid the false action of the transformer differential protection device caused by the outer region grounding fault of the neutral point grounding side when the error of the three-phase current transformers is inconsistent.
Description
Technical field
The utility model relates to a kind of protection equipment for transformer, particularly a kind of negative phase-sequence difference stream synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection.
Background technology
Existing power transformer differential protection device by the ratio brake element, promptly by the ratio of differential current and through current, is discerned external area error and troubles inside the sample space; By shoving and the overexcitation braking member, promptly, discern magnetizing inrush current and overexcitation electric current simultaneously, reach the purpose of differentiating internal fault by analyzing the waveform or the harmonic content of differential current.To both sides being arranged or being the power transformer of neutral-point solid ground more than the both sides, when a ground connection side generating region external ground fault, may big earth fault zero-sequence current appear many sides.For preventing that this zero-sequence current from causing differential protection malfunction, extensively adopt the method that ground connection side three-phase current is carried out conversion at present, eliminate the influence of zero-sequence current.But it is inconsistent to work as ground connection side threephase current transformer error; and transformer is only when the neutral ground side that external area error takes place has power supply; can not eliminate the influence of the zero-sequence current that external ground fault in neutral ground lateral areas causes by conventional method; bigger differential unsymmetrical current will be had; the ratio brake element; the braking member that shoves can not reliably be braked this; especially very little even be under zero the situation at the transformer load electric current; the ratio brake element; the braking member that shoves can not be braked this; as long as error current surpasses threshold, transformer differential protection is with malfunction.
Summary of the invention
The purpose of this utility model provides a kind of negative phase-sequence difference stream synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection; the weighted sum value component ratio braking member of the fundamental negative sequence current by the three-phase differential current that from transformer differential protection, obtains and the zero-sequence current of each neutral ground side (or branch); when rate value during less than setting value K; be judged to district's external ground fault, the outlet of locking three-phase differential protection.The utility model has the advantages that, in the time of can avoiding the threephase current transformer error inconsistent fully, the transformer differential protection malfunction that external ground fault in neutral ground lateral areas causes.
A kind of negative phase-sequence difference stream synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection; the circuit of this device constitutes as shown in Figure 1; it is characterized in that: this device by filter 01,02 ... 0n, first-harmonic negative sequence filter 1, filter 2, multiplier 31,32 ... 3n, adder 4, multiplier 5, comparator 6 constitute, its median filter 01,02 ... the input of 0n is the zero-sequence current instantaneous value signal 3i of each neutral ground side (or branch) of input transformer respectively
10, 3i
20... 3i
N0, filter 01,02 ... the output of 0n connect respectively multiplier 31,32 ... the input of 3n, multiplier 31,32 ... another input of 3n is imported respectively and is preestablished weights k
10, k
20... k
N0Multiplier 31,32 ... the output of 3n connects the input of adder 4 respectively; an input of the output termination multiplier 5 of adder 4; another input input setting value K of multiplier 5; the negative input end of comparator 6 connects the output of multiplier 5, and three inputs of first-harmonic negative sequence filter 1 are imported the three-phase differential current instantaneous value signal i that obtains respectively from transformer differential protection
Da, i
Db, i
Dc, output termination filter 2 inputs of first-harmonic negative sequence filter 1, the positive input terminal of the output termination comparator 6 of filter 2, comparator 6 output three-phase brake signals.Arrive the same side, same no-load voltage ratio and weights 0＜(k in differential current and zero-sequence current reduction
10, k
20... k
N0Under the situation of)≤1, setting value K is 0＜K＜1, and n is a transformer neutral point ground connection side number (or branches).When the positive input terminal signal of comparator 6 less than the negative input end signal, comparator 6 outputs 0 are judged to district's external ground fault, the outlet of locking rate of three phase flow differential protection; Otherwise comparator 6 outputs 1 allow the action of three-phase differential protection.
With prior art relatively; the utility model has the advantages that and proposed first in traditional multiple-limb transformer differential protection; add a kind of fundamental negative sequence current and ratio brake element of constituting of the zero-sequence current weighted sum value of each neutral ground side (or branch) of transformer by the three-phase differential current that from transformer differential protection, obtains; when rate value during less than setting value K; be judged to district's external ground fault, locking rate of three phase flow differential protection general export.Use this programme; in the time of can avoiding the threephase current transformer error inconsistent fully; the transformer differential protection malfunction that external ground fault in neutral ground lateral areas 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
Fig. 1 is the circuit block diagram that prevents the negative phase-sequence difference stream synthetical restraint device of multiple-limb transformer differential protection malfunction.
Embodiment
Embodiment 1
A kind of negative phase-sequence difference stream synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection, this device circuit constitutes as shown in Figure 1, and transformer neutral point ground connection side is counted n=3.When the positive input terminal signal of comparator 6 during less than the negative input end signal, comparator 6 outputs 0 are judged to district's external ground fault, locking rate of three phase flow differential protection general export; Otherwise comparator 6 outputs 1 allow the action of three-phase differential protection.Arrive the same side, same no-load voltage ratio and weights k in differential current and zero-sequence current reduction
10=0.8, k
20=0.6, k
30Under=0.3 the situation, setting value K gets 0.2.The advantage of this device is, in the time of can avoiding the threephase current transformer error inconsistent fully, and the transformer differential protection malfunction that external ground fault in neutral ground lateral areas causes, and the correct operation of differential protection under the zone of influence internal fault situation not.
Claims (2)
1. a negative phase-sequence difference that prevents the malfunction of multiple-limb transformer differential protection flows the synthetical restraint device; it is characterized in that: this device by filter (01,02 ... 0n), first-harmonic negative sequence filter (1), filter (2), multiplier (31,32 ... 3n), adder (4), multiplier (5), comparator (6) constitute, its median filter (01,02 ... input 0n) is the zero-sequence current instantaneous value signal (3i of each neutral ground side (or branch) of input transformer respectively
10, 3i
20... 3i
N0), its output connect respectively multiplier (31,32 ... input 3n), multiplier (31,32 ... another input 3n) is imported respectively and is preestablished weights (k
10, k
20... k
N0); its output connects the input of adder (4) respectively; an input of multiplier (5) is connected with the output of adder (4); its another input input setting value (K); the negative input end of comparator (6) connects the output of multiplier (5), and three inputs of first-harmonic negative sequence filter (1) are imported the three-phase differential current instantaneous value signal (i that obtains respectively from transformer differential protection
Da, i
Db, i
Dc), its output termination filter (2) input, the positive input terminal of the output of filter (2) and comparator (6) joins, and comparator (6) output three-phase brake signal (n) is transformer neutral point ground connection side number (or branches).
2. brake apparatus according to claim 1 is characterized in that: differential current and zero-sequence current reduction to the same side, same no-load voltage ratio and weights 0＜(k
10, k
20... k
N0Under the situation of)≤1, setting value (K) is 0＜K＜1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020126 CN2689560Y (en) | 2004-02-13 | 2004-02-13 | Negative sequential differential flow comprehensive braker for preventing multi-branch transformer differential protector from malfunction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020126 CN2689560Y (en) | 2004-02-13 | 2004-02-13 | Negative sequential differential flow comprehensive braker for preventing multi-branch transformer differential protector from malfunction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2689560Y true CN2689560Y (en) | 2005-03-30 |
Family
ID=34669254
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420020126 Expired - Fee Related CN2689560Y (en) | 2004-02-13 | 2004-02-13 | Negative sequential differential flow comprehensive braker for preventing multi-branch transformer differential protector from malfunction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2689560Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350697C (en) * | 2004-02-13 | 2007-11-21 | 浙江大学 | Negative sequence differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
-
2004
- 2004-02-13 CN CN 200420020126 patent/CN2689560Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350697C (en) * | 2004-02-13 | 2007-11-21 | 浙江大学 | Negative sequence differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |