CN2689556Y - Three-phase braker for preventing multi-branch transformer differential protector from malfunction - Google Patents
Three-phase braker for preventing multi-branch transformer differential protector from malfunction Download PDFInfo
- Publication number
- CN2689556Y CN2689556Y CN 200420020118 CN200420020118U CN2689556Y CN 2689556 Y CN2689556 Y CN 2689556Y CN 200420020118 CN200420020118 CN 200420020118 CN 200420020118 U CN200420020118 U CN 200420020118U CN 2689556 Y CN2689556 Y CN 2689556Y
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- CN
- China
- Prior art keywords
- phase
- transformer
- difference motion
- input
- current
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- 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.)
- Expired - Lifetime
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Abstract
The utility model relates to a three-phase braking device for preventing multi-branch transformer difference motion protector from fault. The device comprises a ratio braking element through three phase difference motion current acquired from a transformer difference motion protection device and the maximum value of the zero sequence current of each neutral point earthing side (or branch) respectively. When the ratio value is smaller than the setting value K, the corresponding phase difference motion current is judged as error current induced by an outer area fault. When a comparator exports 0, the signal is exported by way of an or gate 5. When the or gate 5 exports 0, a three phase difference motion protecting outlet is closed. When the or gate 5 exports 1, the three phase difference motion device is permitted to do protection 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 three-phase brake apparatus 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 is to provide a kind of three-phase brake apparatus that prevents the malfunction of multiple-limb transformer differential protection; by the three-phase differential current that from transformer differential protection, obtains respectively with the zero-sequence current of each neutral ground side (or branch) in maximum component ratio braking member; when differential current and the peaked rate value of zero-sequence current during less than setting value K; declaring corresponding phase differential current is the error current that external area error causes; signal through or door output after, 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 three-phase brake apparatus that prevents the malfunction of multiple-limb transformer differential protection; this device circuit constitutes as shown in Figure 1; it is characterized in that: this device by filter 01,02 ... 0n, filter 11～1 3, maximizing circuit 2, multiplier 3, comparator 41～43 and or door 5 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
N0Its output is connected with the input of maximizing circuit 2 respectively; an input of the output termination multiplier 3 of maximizing circuit 2; another input input setting value K of multiplier 3; the negative input end of its output termination comparator 41～43, 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 positive input terminal of comparator 41～43 respectively, or three inputs of door 5 are connected its output output three-phase brake signal respectively with the output of comparator 41～43.Positive input terminal signal in comparator 41～43 is less than the negative input end signal, and comparator exports 0, and declaring corresponding phase differential current is the error current that external area error causes, otherwise comparator output 1, signal warp or door 5 outputs.Or door 5 was exported the outlet of locking rate of three phase flow differential protection, comparator output 1, the action of permission three-phase differential protection at 0 o'clock.Arrive under the same side, the same no-load voltage ratio situation in differential current and zero-sequence current reduction, setting value K is 0＜K＜1/3, and n is a transformer neutral point ground connection side number (or branches).
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 by the three-phase differential current that from transformer differential protection, obtains respectively with the zero-sequence current of each neutral ground side (or branch) in maximum component ratio braking member; when rate value during less than setting value K; declaring corresponding phase differential current is the error current that external area error causes; signal warp or door output, 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 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 three-phase brake apparatus of multiple-limb transformer differential protection malfunction.
Embodiment
Embodiment 1
A kind of three-phase brake apparatus that prevents the malfunction of multiple-limb transformer differential protection, its circuit constitutes as shown in Figure 1, and transformer neutral point ground connection side is counted n=3.The signal of the positive input terminal in comparator 41～43 is less than the negative input end signal, and comparator exports 0, otherwise exports 1, signal warp or door 5 outputs.Or door 5 was exported locking rate of three phase flow differential protection general export at 0 o'clock; Exported 1 o'clock, and allowed the action of three-phase differential protection.Arrive under the same side, the same no-load voltage ratio situation in differential current and zero-sequence current reduction, setting value K gets 0.1.The advantage of this device is the transformer differential protection malfunction that can avoid external ground fault in neutral ground lateral areas to cause fully, and not under the zone of influence internal fault situation, the correct operation of differential protection.
Claims (2)
1. three-phase brake apparatus that prevents the malfunction of multiple-limb transformer differential protection; it is characterized in that: this device by filter (01,02 ... 0n), filter (11～13), maximizing circuit (2), multiplier (3), comparator (41～43) and or door (5) 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 joins with the input of maximizing circuit (2) respectively; an input of the output termination multiplier (3) of maximizing circuit (2); another input input setting value (K) of multiplier (3); the negative input end of its output termination comparator (41～43), 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 positive input terminal of comparator (41～43) respectively, or three inputs of door (5) are connected with the output of comparator (41～43) respectively, and its output 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: under the same side, same no-load voltage ratio situation, setting value (K) is 0＜K＜1/3 in differential current and zero-sequence current reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020118 CN2689556Y (en) | 2004-02-13 | 2004-02-13 | Three-phase braker for preventing multi-branch transformer differential protector from malfunction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020118 CN2689556Y (en) | 2004-02-13 | 2004-02-13 | Three-phase braker for preventing multi-branch transformer differential protector from malfunction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2689556Y true CN2689556Y (en) | 2005-03-30 |
Family
ID=34669247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420020118 Expired - Lifetime CN2689556Y (en) | 2004-02-13 | 2004-02-13 | Three-phase braker for preventing multi-branch transformer differential protector from malfunction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2689556Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409523C (en) * | 2004-02-13 | 2008-08-06 | 浙江大学 | Three-phase brake device for preventing multiple-branch voltage transformer differential protection unwanted operation |
-
2004
- 2004-02-13 CN CN 200420020118 patent/CN2689556Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100409523C (en) * | 2004-02-13 | 2008-08-06 | 浙江大学 | Three-phase 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 | ||
| AV01 | Patent right actively abandoned |
Effective date of abandoning: 20080806 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |