CN2689551Y - Comprehensive differential flow braker for preventing transformer differential protection from malfunction - Google Patents
Comprehensive differential flow braker for preventing transformer differential protection from malfunction Download PDFInfo
- Publication number
- CN2689551Y CN2689551Y CN 200420020112 CN200420020112U CN2689551Y CN 2689551 Y CN2689551 Y CN 2689551Y CN 200420020112 CN200420020112 CN 200420020112 CN 200420020112 U CN200420020112 U CN 200420020112U CN 2689551 Y CN2689551 Y CN 2689551Y
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- China
- Prior art keywords
- current
- filter
- comparator
- input
- transformer
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- Expired - Lifetime
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Abstract
The utility model relates to a comprehensive differential flow braking device for preventing transformer differential protection from false action. The device comprises a ratio braking element through using the positive sequence current of the base wave or the negative sequence current of the base wave of three-phase difference motion current in a transformer differential protection device and the zero sequence current of a Y < 0 > side. When the ratio value of the positive sequence current of the base wave or the negative sequence current of the base wave of the difference motion current is smaller than a setting value K, the situation is judged as an outer area earthing fault of the Y < 0 > side. A comparator 4 exports 0, and a three phase difference motion protection outlet is closed. Otherwise, the comparator 4 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 protection device which the outer region earthing fault of the Y < 0 > side induces when the error of three-phase current transformers is inconsistent. The utility model doesn't influence the correct action of the difference motion protection device under the situationof the inner area fault.
Description
Technical field
The utility model relates to a kind of protection equipment for transformer, particularly a kind of comprehensive poor stream brake apparatus that prevents the transformer differential protection malfunction.
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 Y
0The power transformer of/Δ wiring is for preventing Y
0Lateral areas external ground fault zero-sequence current causes differential protection malfunction, extensively adopts Y at present
0The side three-phase current carries out the method for conversion, eliminates the influence of zero-sequence current.But work as Y
0Side threephase current transformer error is inconsistent, and transformer is only at the Y that external area error takes place
0When side has power supply, can not eliminate Y by conventional method
0The influence of the zero-sequence current that lateral areas external ground fault causes; bigger differential unsymmetrical current will be had; ratio brake element, the braking member that shoves can not reliably be braked this; especially very little even be under zero the situation at transformer opposite side load current; 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 comprehensive poor stream brake apparatus that prevents the transformer differential protection malfunction, by fundamental positive sequence electric current or fundamental negative sequence current and the Y with the three-phase differential current in the transformer differential protection
0Side zero-sequence current component ratio braking member when the fundamental positive sequence electric current of differential current or fundamental negative sequence current and zero-sequence current rate value during less than setting value K, is judged to Y
0Lateral areas 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, Y
0The transformer differential protection malfunction that lateral areas external ground fault causes, and the correct operation of differential protection under the zone of influence internal fault situation not.
A kind of comprehensive poor stream brake apparatus that prevents the transformer differential protection malfunction, the circuit of this device constitutes as shown in Figure 1, and it is characterized in that: this device is made of filter 01, first-harmonic phase sequence pass filter 1, filter 2, multiplier 3, comparator 4.The input input transformer Y of its median filter 01
oSide zero-sequence current instantaneous value signal 3i
o, an input of its output termination multiplier 3, another input input setting value K of multiplier, the negative input end of its output termination comparator 4, three inputs of first-harmonic phase sequence pass filter 1 are imported three-phase differential current instantaneous value signal i respectively
Da, i
Db, i
Dc, the input of its output termination filter 2, the output of filter 2 is connected with the positive input terminal of comparator 4, comparator 4 output three-phase brake signals.When comparator 4 positive input terminal signals less than the negative input end signal, comparator 4 output 0 is judged to district's external ground fault, the outlet of locking three-phase differential protection.Otherwise comparator 4 outputs 1 allow the action of three-phase differential protection.Arrive under the same side, the same no-load voltage ratio situation in differential current and the equal reduction of zero-sequence current, setting value K is 0＜K＜1.First-harmonic phase sequence pass filter is the fundamental positive sequence pass filter, perhaps is the first-harmonic negative sequence filter.
Compare with prior art, the utility model has the advantages that to have proposed in traditional transformer differential protection, to set up a kind of fundamental positive sequence electric current or fundamental negative sequence current and Y first with the three-phase differential current in the transformer differential protection
0Side zero-sequence current component ratio braking member when the fundamental positive sequence electric current of differential current or fundamental negative sequence current and zero-sequence current rate value during less than setting value K, is judged to Y
0Lateral areas external ground fault, the outlet of locking three-phase differential protection.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 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 comprehensive poor stream brake apparatus of transformer differential protection malfunction.
Embodiment
Embodiment 1:
A kind of comprehensive poor stream brake apparatus that prevents the transformer differential protection malfunction; its circuit structure as shown in Figure 1; when comparator 4 positive input terminal signals less than the negative input end signal; be judged to district's external ground fault; comparator 4 outputs 0; the outlet of locking three-phase differential protection, otherwise comparator 4 outputs 1 allow the action of three-phase differential protection.Arrive under the same side, the same no-load voltage ratio situation in differential current and the equal reduction of zero-sequence current, setting value K is 0.5, and first-harmonic phase sequence pass filter 1 is the fundamental positive sequence pass filter.The advantage of this device 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, and the correct operation of differential protection under the zone of influence internal fault situation not.
Claims (3)
1. comprehensive poor stream brake apparatus that prevents the transformer differential protection malfunction is characterized in that: this device is made of filter (01), first-harmonic phase sequence pass filter (1), filter (2), multiplier (3), comparator (4).The input input transformer Y of its median filter (01)
oSide zero-sequence current instantaneous value signal (3i
o), an input of its output termination multiplier (3), another input input setting value (K) of multiplier (3), the negative input end of its output termination comparator (4), three inputs of first-harmonic phase sequence pass filter (1) are imported three-phase differential current instantaneous value signal (i respectively
Da, i
Db, i
Dc) input of its output termination filter (2), the output of filter (2) is connected with the positive input terminal of comparator (4), and comparator (4) is exported the three-phase brake signal.
2. device according to claim 1 is characterized in that: first-harmonic phase sequence pass filter (1) is the fundamental positive sequence pass filter, perhaps is the first-harmonic negative sequence filter.
3. device 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 in differential current and the equal reduction of zero-sequence current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020112 CN2689551Y (en) | 2004-02-13 | 2004-02-13 | Comprehensive differential flow braker for preventing transformer differential protection from malfunction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020112 CN2689551Y (en) | 2004-02-13 | 2004-02-13 | Comprehensive differential flow braker for preventing transformer differential protection from malfunction |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2689551Y true CN2689551Y (en) | 2005-03-30 |
Family
ID=34669241
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420020112 Expired - Lifetime CN2689551Y (en) | 2004-02-13 | 2004-02-13 | Comprehensive differential flow braker for preventing transformer differential protection from malfunction |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2689551Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350694C (en) * | 2004-02-13 | 2007-11-21 | 浙江大学 | Integrated differential flow brake device for preventing voltage transformer differential protection unwanted operation |
-
2004
- 2004-02-13 CN CN 200420020112 patent/CN2689551Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100350694C (en) * | 2004-02-13 | 2007-11-21 | 浙江大学 | Integrated differential flow brake device for preventing 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: 20071121 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |