CN2689558Y - Maximum differential comprehensive braker for preventing multi-branch transformer differential protector from malfunction - Google Patents
Maximum differential comprehensive braker for preventing multi-branch transformer differential protector from malfunction Download PDFInfo
- Publication number
- CN2689558Y CN2689558Y CN 200420020124 CN200420020124U CN2689558Y CN 2689558 Y CN2689558 Y CN 2689558Y CN 200420020124 CN200420020124 CN 200420020124 CN 200420020124 U CN200420020124 U CN 200420020124U CN 2689558 Y CN2689558 Y CN 2689558Y
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- CN
- China
- Prior art keywords
- input
- transformer
- comparator
- output
- difference motion
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- Expired - Lifetime
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Abstract
The utility model relates to a maximum differential comprehensive braking device for preventing multi-branch transformer difference motion protection from false action. The device comprises a ratio braking element through the maximum value of three phase difference motion current acquired from a transformer difference motion protection device and the weighting summation value of the zero sequence current of each neutral point earthing side (or branch) of the transformer. When the signal of the positive input terminal of a comparator 6 is smaller than the signal of the negative input terminal, the comparator 6 exports 0. The situation is judged as an outer region earthing fault, and a general three phase difference motion protecting outlet is closed. Otherwise, the comparator 6 exports 1 and permits the three phase difference motion protection device to do action. The advantages of the project are : the utility model can completely avoid the false action of the transformer difference motion protecting device which the outer region earthing fault of the neutral point earthing side induces when the error of the three-phase current transformers is inconsistent. The utility model doesn't influence the correct action of the difference motion protecting device under the situation of the inner area fault.
Description
Technical field
The utility model relates to a kind of protection equipment for transformer, particularly a kind of maximum 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 maximum 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 zero-sequence current by the maximum in the three-phase differential current that from transformer differential protection, obtains and each neutral ground side (or branch) of transformer; 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, and the correct operation of differential protection under the zone of influence internal fault situation not.
A kind of maximum difference stream synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection; this device circuit constitutes as shown in Figure 1; it is characterized in that: a kind of maximum difference stream synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection; it is characterized in that: this device is by filter 01; 02; 0n; multiplier 31; 32; 3n; adder 4; multiplier 5; filter 11～13; maximizing circuit 2; comparator 6 constitutes 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
N0Its output 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
N0Its output connects the input of adder 4 respectively; the output of an input termination adder 4 of multiplier 5; its another input input setting value K; the output of the negative input end of comparator 6 and multiplier 5 joins, and the input of filter 11～13 is imported the three-phase differential current instantaneous value signal i that obtains respectively from transformer differential protection
Da, i
Db, i
Dc, its output connects the input of maximizing circuit 2 respectively, and the output of maximizing circuit 2 is connected with the positive input terminal of comparator 6, 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＜1/3, 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 transformer differential protection; add a kind of ratio brake element that constitutes by the zero-sequence current weighted sum value of the maximum in the three-phase differential current that from transformer differential protection, obtains and each neutral ground side (or branch) of transformer; when rate value during less than setting value K; be judged to district's external ground fault, the outlet of locking rate of three phase flow differential protection.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 not under the zone of influence internal fault situation, the correct operation of differential protection.
Description of drawings
Fig. 1 is the circuit block diagram that prevents the maximum difference stream synthetical restraint device of multiple-limb transformer differential protection malfunction.
Embodiment
Embodiment 1
A kind of maximum 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, the outlet of locking rate of three phase flow differential protection; Otherwise comparator 6 outputs 1 allow the action of three-phase differential protection.When differential current and zero-sequence current reduction to the same side, same no-load voltage ratio and weights k
10=0.8, k
20=0.6, k
30Under=0.3 the situation, setting value K is 0.1.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. maximum difference stream synthetical restraint device that prevents the malfunction of multiple-limb transformer differential protection; it is characterized in that: this device by filter (01,02 ... 0n), multiplier (31,32 ... 3n), adder (4), multiplier (5), filter (11～13), maximizing circuit (2), 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; the output termination of an input termination adder (4) of multiplier (5); its another input input setting value (K); the output of the negative input end of comparator (6) and multiplier (5) joins, and the input of filter (11～13) is imported the three-phase differential current instantaneous value signal (i that obtains respectively from transformer differential protection
Da, i
Db, i
Dc), its output connects the input of maximizing circuit (2) respectively, the output of maximizing circuit (2) is connected with the positive input terminal of comparator (6), and the output output three-phase brake signal of comparator (6) (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＜1/3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020124 CN2689558Y (en) | 2004-02-13 | 2004-02-13 | Maximum differential comprehensive braker for preventing multi-branch transformer differential protector from malfunction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020124 CN2689558Y (en) | 2004-02-13 | 2004-02-13 | Maximum differential comprehensive braker for preventing multi-branch transformer differential protector from malfunction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2689558Y true CN2689558Y (en) | 2005-03-30 |
Family
ID=34669252
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420020124 Expired - Lifetime CN2689558Y (en) | 2004-02-13 | 2004-02-13 | Maximum differential comprehensive braker for preventing multi-branch transformer differential protector from malfunction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2689558Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100413166C (en) * | 2004-02-13 | 2008-08-20 | 浙江大学 | Maximum differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
| CN106356815A (en) * | 2016-09-22 | 2017-01-25 | 南京国电南自电网自动化有限公司 | Large differential protection sympathetic inrush current small differential AND gate locking method for dual-winding converter transformers |
-
2004
- 2004-02-13 CN CN 200420020124 patent/CN2689558Y/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100413166C (en) * | 2004-02-13 | 2008-08-20 | 浙江大学 | Maximum differential flow integrated brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
| CN106356815A (en) * | 2016-09-22 | 2017-01-25 | 南京国电南自电网自动化有限公司 | Large differential protection sympathetic inrush current small differential AND gate locking method for dual-winding converter transformers |
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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 | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080820 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |