CN100350694C - Integrated differential flow brake device for preventing voltage transformer differential protection unwanted operation - Google Patents
Integrated differential flow brake device for preventing voltage transformer differential protection unwanted operation Download PDFInfo
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- CN100350694C CN100350694C CNB2004100162799A CN200410016279A CN100350694C CN 100350694 C CN100350694 C CN 100350694C CN B2004100162799 A CNB2004100162799 A CN B2004100162799A CN 200410016279 A CN200410016279 A CN 200410016279A CN 100350694 C CN100350694 C CN 100350694C
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- electric current
- differential protection
- filter
- differential
- comparator
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Abstract
The present invention relates to an integrated differential flow stop device for preventing the unwanted operation of differential protection for transformers; a ratio braking element of the device is composed of a positive sequence electric current of a basal wave of a three-phase differential electric current in longitudinal differential protection for transformers or a negative sequence electric current of the basal wave and a zero sequence electric current at a y<o> side; when the ratio value of the positive sequence electric current of a basal wave of or a differential electric current and the negative sequence electric current of the basal wave to the zero sequence electric current is smaller than a definite value K, an external grounding fault at a y<o> side is judged; a comparator 4 outputs 0; a three-phase differential protection outlet is locked; or the comparator 4 outputs 1; three-phase differential protection is allowed to act. The proposal has the advantages that the present invention can thoroughly avoid the unwanted operation of differential protection for transformers caused by the external grounding fault at the y<o> side when the errors of a three-phase electric current transformer are not consistent, and has no influence on the correct action of differential protection for internal faults.
Description
Technical field
The present invention 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 invention is to provide 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 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.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, 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; it is characterized in that: this device is made of first filter 01, first-harmonic phase sequence pass filter 1, second filter 2, multiplier 3, comparator 4, wherein the input input transformer Y of first 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 second filter 2, the output of second 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.
With prior art relatively, advantage of the present invention is to have proposed to set up in traditional transformer differential protection a kind of fundamental positive sequence electric current or fundamental negative sequence current and Y with the three-phase differential current in the transformer differential protection first
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; it is characterized in that: this device is made of first filter (01), first-harmonic phase sequence pass filter (1), second filter (2), multiplier (3), comparator (4), wherein the input input transformer Yo side zero-sequence current instantaneous value signal (3i of first filter (01)
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 second filter (2), the output of second 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 |
|---|---|---|---|
| CNB2004100162799A CN100350694C (en) | 2004-02-13 | 2004-02-13 | Integrated differential flow brake device for preventing voltage transformer differential protection unwanted operation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100162799A CN100350694C (en) | 2004-02-13 | 2004-02-13 | Integrated differential flow brake device for preventing voltage transformer differential protection unwanted operation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1558486A CN1558486A (en) | 2004-12-29 |
| CN100350694C true CN100350694C (en) | 2007-11-21 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100162799A Expired - Fee Related CN100350694C (en) | 2004-02-13 | 2004-02-13 | Integrated differential flow brake device for preventing voltage transformer differential protection unwanted operation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100350694C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115800213B (en) * | 2022-11-29 | 2023-07-04 | 珠海康晋电气股份有限公司 | Distributed power distribution automation measurement and control terminal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047887C (en) * | 1994-01-06 | 1999-12-29 | 施耐德电器公司 | Device for differentially protecting a power transformer |
| CN1402400A (en) * | 2002-08-26 | 2003-03-12 | 南京南瑞继保电气有限公司 | Variable slope differential ratio protection method |
| CN2689551Y (en) * | 2004-02-13 | 2005-03-30 | 浙江大学 | Comprehensive differential flow braker for preventing transformer differential protection from malfunction |
-
2004
- 2004-02-13 CN CNB2004100162799A patent/CN100350694C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1047887C (en) * | 1994-01-06 | 1999-12-29 | 施耐德电器公司 | Device for differentially protecting a power transformer |
| CN1402400A (en) * | 2002-08-26 | 2003-03-12 | 南京南瑞继保电气有限公司 | Variable slope differential ratio protection method |
| CN2689551Y (en) * | 2004-02-13 | 2005-03-30 | 浙江大学 | Comprehensive differential flow braker for preventing transformer differential protection from malfunction |
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| Publication number | Publication date |
|---|---|
| CN1558486A (en) | 2004-12-29 |
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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 | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Ningbo Heiger Electrical Appliances Co.,Ltd. Assignor: Zhejiang University Contract fulfillment period: 2007.12.15 to 2014.12.14 contract change Contract record no.: 2009330000780 Denomination of invention: Integrated difference stream brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components Granted publication date: 20071121 License type: Exclusive license Record date: 2009.4.24 |
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| LIC | Patent licence contract for exploitation submitted for record |
Free format text: EXCLUSIVE LICENSE; TIME LIMIT OF IMPLEMENTING CONTACT: 2007.12.15 TO 2014.12.14; CHANGE OF CONTRACT Name of requester: NINGBO HAIGE ELECTRICAL APPLIANCES CO., LTD. Effective date: 20090424 |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20071121 Termination date: 20110213 |