CN2687917Y - Split-phase brake device for preventing transformer differential protection from being malfunction using failure component - Google Patents
Split-phase brake device for preventing transformer differential protection from being malfunction using failure component Download PDFInfo
- Publication number
- CN2687917Y CN2687917Y CN 200420020113 CN200420020113U CN2687917Y CN 2687917 Y CN2687917 Y CN 2687917Y CN 200420020113 CN200420020113 CN 200420020113 CN 200420020113 U CN200420020113 U CN 200420020113U CN 2687917 Y CN2687917 Y CN 2687917Y
- Authority
- CN
- China
- Prior art keywords
- current
- input
- transformer
- difference motion
- differential protection
- Prior art date
- 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
Links
- 230000007257 malfunction Effects 0.000 title claims description 17
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- XQGSVNHIIVBMPX-UHFFFAOYSA-N Improsulfan tosylate Chemical compound CC1=CC=C(S([O-])(=O)=O)C=C1.CS(=O)(=O)OCCC[NH2+]CCCOS(C)(=O)=O XQGSVNHIIVBMPX-UHFFFAOYSA-N 0.000 abstract 1
- 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
Images
Landscapes
- Protection Of Transformers (AREA)
Abstract
The utility model relates to a phase-splitting braking device for preventing transformer differential protection from being false action using failure component. The device comprises a ratio braking element through using the suddenly-changed quantity of three phase difference motion current in a transformer differential protection device and the suddenly-changed quantity of zero sequence current. When the ratio value of the suddenly-changed quantity of the three phase difference motion current and the suddenly-changed quantity of the zero sequence current is smaller than a setting value K, a comparator exports 0. The corresponding phase difference motion current is judged as error current induced by an outer area fault, and the corresponding phase braking signal is exported. The corresponding phase difference motion protecting is carried on braking, preventing the false action of the transformer difference motion protecton device. Otherwise, the comparator exports 1 and permits the corresponding 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 currenttransformers is inconsistent. The utility model doesn't influence the correct action of the difference motion protection 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 phase-splitting brake apparatus that utilizes fault component to prevent 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 phase-splitting brake apparatus that utilizes fault component to prevent the transformer differential protection malfunction; by with the sudden change amount of the three-phase differential current in the transformer differential protection respectively with the sudden change amount component ratio braking member of zero-sequence current; when the sudden change amount rate value of the sudden change amount of differential current and zero-sequence current during less than setting value K; declaring corresponding phase differential current is the error current that external area error causes; export corresponding phase brake signal; corresponding phase differential protection is braked, prevented the transformer differential protection malfunction.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 phase-splitting brake apparatus that utilizes fault component to prevent the transformer differential protection malfunction; this device circuit constitutes as shown in Figure 1; it is characterized in that: this device is made of memory 11～14, subtracter 21～24, filter 31～34, multiplier 4, comparator 51～53, wherein the three-phase differential current instantaneous value signal i of the positive input terminal of the input of memory 11～13 and subtracter 21～23 difference input transformer differential protection formation
Da, i
Db, i
DcThe negative input end of subtracter 21～23 is connected with the output of memory 11～13 respectively, its output connects the input of filter 31～33 respectively, the output of filter 31～33 connects the positive input terminal of comparator 51～53 respectively, and the positive input terminal of the input of memory 14 and subtracter 24 is input transformer Y respectively
0Side zero-sequence current instantaneous value signal 3i
0The negative input end of subtracter 24 connects the output of memory 14, the input of filter 34 is connected with the output of subtracter 24, an input of its output termination multiplier 4, another input input setting value K of multiplier 4, its output connects the negative input end of comparator 51～53 respectively, and comparator 51～53 is exported the brake signal of A, B, C phase respectively.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＜1/3.When comparator positive input terminal signal less than the negative input end signal, comparator output 0, declaring corresponding phase differential current is the error current that external area error causes, exports corresponding phase brake signal, and corresponding phase differential protection is braked, and prevents the transformer differential protection malfunction; Otherwise comparator output 1 allows corresponding phase differential protection action.
With prior art relatively, the utility model has the advantages that proposed first in traditional transformer differential protection, to set up a kind of by with the differential current sudden change amount in the transformer differential protection respectively with zero-sequence current sudden change amount 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, export corresponding phase brake signal, corresponding phase differential protection is braked, prevented the transformer differential protection malfunction; 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 utilizes fault component to prevent the circuit block diagram of the phase-splitting brake apparatus of transformer differential protection malfunction.
Embodiment
A kind of phase-splitting brake apparatus that utilizes fault component to prevent the transformer differential protection malfunction, this device circuit constitutes as shown in Figure 1, arrives under the same side, the same no-load voltage ratio situation in differential current and the equal reduction of zero-sequence current, and setting value K gets 0.2.When comparator 51～53 positive input terminal signals less than the negative input end signal, comparator output 0, declaring corresponding phase differential current is the error current that external area error causes, exports corresponding phase brake signal, corresponding phase differential protection is braked, prevented the transformer differential protection malfunction; Otherwise comparator output 1 allows corresponding phase differential protection action.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. phase-splitting brake apparatus that utilizes fault component to prevent the transformer differential protection malfunction; it is characterized in that: this device is made of memory (11～14), subtracter (21～24), filter (31～34), multiplier (4), comparator (51～53), wherein the three-phase differential current instantaneous value signal (i of the positive input terminal of the input of memory (11～13) and subtracter (21～23) difference input transformer differential protection formation
Da, i
Db, i
Dc), the negative input end of subtracter (21～23) is connected with the output of memory (11～13) respectively, its output connects the input of filter (31～33) respectively, the output of filter (31～33) connects the positive input terminal of comparator (51～53) respectively, and the positive input terminal of the input of memory (14) and subtracter (24) is input transformer Y respectively
oSide zero-sequence current instantaneous value signal (3i
o), the negative input end of subtracter (24) connects the output of memory (14), the input of filter (34) is connected with the output of subtracter (24), an input of its output termination multiplier (4), another input input setting value (K) of multiplier (4), its output connects the negative input end of comparator (51～53) respectively, and comparator (51～53) is exported the brake signal of (A, B, C) phase respectively.
2. 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＜1/3 in differential current and the equal reduction of zero-sequence current.
3 devices according to claim 1 is characterized in that: the characteristic of filter (31～34) should be consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020113 CN2687917Y (en) | 2004-02-13 | 2004-02-13 | Split-phase brake device for preventing transformer differential protection from being malfunction using failure component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420020113 CN2687917Y (en) | 2004-02-13 | 2004-02-13 | Split-phase brake device for preventing transformer differential protection from being malfunction using failure component |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2687917Y true CN2687917Y (en) | 2005-03-23 |
Family
ID=34669242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420020113 Expired - Lifetime CN2687917Y (en) | 2004-02-13 | 2004-02-13 | Split-phase brake device for preventing transformer differential protection from being malfunction using failure component |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2687917Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100413165C (en) * | 2004-02-13 | 2008-08-20 | 浙江大学 | Phase-splitting brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components |
-
2004
- 2004-02-13 CN CN 200420020113 patent/CN2687917Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100413165C (en) * | 2004-02-13 | 2008-08-20 | 浙江大学 | Phase-splitting brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2687917Y (en) | Split-phase brake device for preventing transformer differential protection from being malfunction using failure component | |
| CN2687915Y (en) | Split-phase brake device for preventing transformer differential protection from being malfunction | |
| CN2689552Y (en) | Three-phase braker for preventing transformer differential protector from malfunction by fault component | |
| CN2687916Y (en) | Maximum different-current brake device for preventing transformer differential protection from being malfunction | |
| CN2689550Y (en) | Three-phase brake for preventing transformer differential prevent from malfunction | |
| CN100413165C (en) | Phase-splitting brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components | |
| CN2689554Y (en) | Split-phase braker for preventing multi-branch transformer differential protector from malfunction | |
| CN2689555Y (en) | Split-phase braker for preventing multi-branch transformer differential protector from malfunction | |
| CN100407534C (en) | Three-phase brake device for preventing voltage transformer differential protection unwanted operation | |
| CN100350707C (en) | Split-phase zero-sequence fault component braking method for preventing malfunction for transformer protection | |
| CN100367596C (en) | Phase-splitting brake device for preventing voltage transformer differential protection unwanted operation | |
| CN100392934C (en) | Phase-splitting difference stream method for preventing voltage transformer differential protection unwanted operation by utilizing fault components | |
| CN2689553Y (en) | Maximum differential flow braker for preventing transformer differential protector from malfunction by fault component | |
| CN100388581C (en) | Phase-splitting differential flow method for preventing voltage transformer differential protection unwanted operation | |
| CN100394655C (en) | Maximum current zero-sequece fault component braking method for preventing malfunction for transformer protection | |
| CN2689551Y (en) | Comprehensive differential flow braker for preventing transformer differential protection from malfunction | |
| CN100350709C (en) | Positive and zero sequence fault component braking method for preventing transformer protection from malfunction | |
| CN100350695C (en) | Integrated difference stream brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components | |
| CN100350705C (en) | Maximum current zero sequence braking method for preventing transformer protection malfunction | |
| CN2689556Y (en) | Three-phase braker for preventing multi-branch transformer differential protector from malfunction | |
| CN2711960Y (en) | Fault component phase spliting zero sequence brake for preventing transformer protection from error action | |
| CN100409522C (en) | Three-phase brake device for preventing voltage transformer differential protection unwanted operation by utilizing fault components | |
| CN1614848A (en) | Positive sequence and zero sequence braking method for preventing transformer protection from malfunction | |
| CN100350708C (en) | Maximum changing carrent zero-sequence fault component braking method for preventing malfunction for transformer protection | |
| CN100367601C (en) | Split-phase zero sequence braking method for preventing transformer protection from malfunction |
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 |