CN202404194U - On-pole demarcation switch intelligent terminal used for distinguishing single-phase earth fault of power distribution network - Google Patents
On-pole demarcation switch intelligent terminal used for distinguishing single-phase earth fault of power distribution network Download PDFInfo
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- CN202404194U CN202404194U CN2011204699407U CN201120469940U CN202404194U CN 202404194 U CN202404194 U CN 202404194U CN 2011204699407 U CN2011204699407 U CN 2011204699407U CN 201120469940 U CN201120469940 U CN 201120469940U CN 202404194 U CN202404194 U CN 202404194U
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Abstract
An on-pole demarcation switch intelligent terminal used for distinguishing a single-phase earth fault of a power distribution network comprises a data acquisition module, an electronic filter, an A/D (Analog-to-Digital) converter, a memory, a parameter operation setting processor, and a fault determination module; wherein, a fuzzy data window figure fitting algorithm is built in the electronic filter. The on-pole demarcation switch intelligent terminal of the utility model performs fuzzy fitting for waveforms of a zero-sequence voltage and a zero-sequence current through the electronic filter with the built-in fuzzy data window figure fitting algorithm, and can accurately sample fault characteristic quantities of an arc suppression coil within 5ms after the arc suppression coil operates in the instant of the earth fault, the fault characteristic quantities can obviously distinguish zero-sequence current phases of a fault line and a non-fault line in the instant of the fault; at the same time, the fault determination module can accurately determine the fault line by taking power directions and operation parameter changes of the arc suppression coil as a combined criterion, an accurate rate of the fault determination module can reach 100%, therefore, when the fault occurs on the line, an on-pole demarcation switch can accurately trip out to isolate the fault, thereby ensuring that other branches of the line can operate safely and stably.
Description
Technical field
The utility model relates to the Power System and its Automation technical field, demarcation switch intelligent terminal on particularly a kind of post that is used to differentiate one-phase earthing failure in electric distribution network.
Background technology
Demarcation switch is the new projects that produce along with the development of the distribution network automated technology of China in the last few years on the post; This equipment can get the jump on the preceding preferential tripping operation isolated fault of the 10kV of transformer station outlet tripping operation when the branch road failed because; Thereby having guaranteed the non-fault branch safe operation on the same line road, is the very important ring of distribution network automated system.At present; The demarcation switch intelligent terminal is comparatively accurate through the judgement of low resistance grounding system single-phase earth fault for isolated neutral system and neutral point on the existing post; But the judgement for the neutral by arc extinction coil grounding system single-phase earth fault also has problems; Because in the neutral by arc extinction coil grounding system, during over-compensation, the direction of singlephase earth fault stable status zero-sequence current is identical for faulty line and non-fault line; Bring difficulty for the examination of faulty line, cause the accuracy rate of fault judgement on the low side.At present neutral point is mainly contained dual mode through the judgement of arc suppression coil earthing system singlephase earth fault:
1. give arc suppression coil and connecting resistance, the zero-sequence current of circuit when to change singlephase earth fault taking place is judged earth fault through detecting zero-sequence current.The main deficiency of this scheme is:
1. need increase resistance and relevant switching control device on the line, increase the cost input;
2. behind arc suppression coil and the connecting resistance, the electric current of faulty line earth point will increase greatly, and direct threats the safe and stable operation of circuit;
3. the fault signature amount that arc suppression coil and connecting resistance collected is the characteristic quantity after the system stability ground connection, and the judgement of this steady-state quantity generally wants to accomplish several seconds, and powerless usually for the transient fault less than several seconds.
2. when singlephase earth fault takes place, only rely on the variation of zero-sequence current amplitude to come failure judgement.The main deficiency of this scheme is: when singlephase earth fault takes place; Faulty line and non-fault line zero-sequence current increase is in various degree all arranged; And the zero-sequence current direction during stable state is all for pointing to circuit by bus; So power directional element can't be discerned faulty line, cause the accuracy rate of failure judgement circuit lower.
In sum, first kind of scheme changed system operational parameters, even had influence on the safe operation of system, and still has the fault distinguishing defective; The accuracy rate of second kind of scheme fault distinguishing is lower, if but make the power directional element effect be able to bring into play with satisfactory the dealing with problems of ability through certain means.According to being summarized, actual operation parameters repeatedly draws; The compensation process of arc suppression coil is generally accomplished in the 5ms that single-phase earthing takes place, and in this 5ms, the zero-sequence current of faulty line is to bus from line flows; With the direction of non-fault line zero-sequence current is different; Behind the 5ms, the direction of faulty line and non-fault line zero-sequence current becomes in the same way, flows to circuit by bus.Therefore, key point is that zero-sequence current direction and the collection of amplitude and the collection that protection starts of circuit in the 5ms take place singlephase earth fault.
The utility model content
The fundamental purpose of the utility model is the shortcoming that overcomes prior art; A kind of accurately failure judgement circuit is provided; Guarantee when this line failure on the post demarcation switch isolated fault of can accurately tripping, guarantee to be used to differentiate demarcation switch intelligent terminal on the post of one-phase earthing failure in electric distribution network with other branch road safe and stable operations of circuit.
The utility model adopts following technical scheme:
Be used to differentiate demarcation switch intelligent terminal on the post of one-phase earthing failure in electric distribution network, include:
Be used to gather the data acquisition module of bus three-phase voltage and this circuit zero-sequence current;
Be used for the analog quantity of data collecting module collected is carried out the electronic type wave filter of figure match, this electronic type is filter-incorporated to have fuzzy data window figure fitting algorithm;
A/D converter;
Storer;
From storer, transfer data and carry out the parameters calculated computing processor of adjusting;
Circuit is carried out the fault verification module of fault verification.
Said data acquisition module is connected in the signal input part of electronic type wave filter; The signal output part of said electronic type wave filter is connected in the signal input part of A/D converter; The signal output part of said A/D converter is connected in storer, and adjust processor and fault verification module of said parameter computing is connected in storer.
Said fault verification module is connected by the motor-operating mechanism of demarcation switch on a folding control module and the post.
Can know that by above-mentioned description to the utility model compared with prior art, the beneficial effect of the utility model is: the electronic type wave filter through built-in fuzzy data window figure fitting algorithm blurs match to the waveform of residual voltage and zero-sequence current; Fault signature amount in the moment arc suppression coil input 5ms takes place in the earth fault of can accurately sampling; This fault signature amount can obviously be distinguished the zero-sequence current phase place of fault generation transient fault circuit and non-fault line, and simultaneously, the fault verification module is changed to the combination criterion with power direction and arc suppression coil input parameter; Make power directional element be able to intact application; Accurate failure judgement circuit, accuracy reaches 100%, has guaranteed when this line failure; The demarcation switch isolated fault of can accurately tripping is guaranteed with other branch road safe and stable operations of circuit on the post.
Description of drawings
Fig. 1 is the structured flowchart of the utility model embodiment;
Fig. 2 is the method for discrimination logical diagram of the fault verification module of the utility model embodiment.
Among the figure: 1. data acquisition module, 2. electronic type wave filter, 3.A/D converter, 4. storer, 5. adjust processor, 6. fault verification module of parameter computing.
Embodiment
Below the utility model is done further to describe through embodiment.
With reference to Fig. 1; Demarcation switch intelligent terminal on a kind of post that is used to differentiate the neutral by arc extinction coil grounding system single-phase earth fault; Include the data acquisition module 1 that is used for gathering bus three-phase voltage and this circuit zero-sequence current, be used for to analog quantity carry out the figure match electronic type wave filter 2, A/D converter 3, storer 4, transfer data and carry out adjust processor 5 and circuit carried out the fault verification module 6 of fault verification of parameters calculated computing from storer 4, this electronic type wave filter 2 is built-in with fuzzy data window figure fitting algorithm.Said data acquisition module 1 is connected in the signal input part of electronic type wave filter 2; The signal output part of said electronic type wave filter 2 is connected in the signal input part of A/D converter 3; The signal output part of said A/D converter 3 is connected in storer 4; Adjust processor 5 and fault verification module 6 of said parameter computing is connected in storer 4, and said fault verification module 6 is connected by the motor-operating mechanism of demarcation switch on a folding control module and the post.
See figures.1.and.2, the utility model is used to differentiate the method for discrimination of neutral by arc extinction coil grounding system single-phase earth fault, may further comprise the steps:
1. gather the bus three-phase voltage U of neutral by arc extinction coil grounding system in real time through data acquisition module 1
A, U
B, U
CAnd this circuit zero sequence electric current I
0, and through the parameter computing synthetic residual voltage U that calculate of processor 5 that adjust
0
2. 2 couples of analog quantity U of electronic type wave filter through built-in fuzzy data window figure fitting algorithm
0And I
0Waveform blur match, the moment arc suppression coil takes place and drops into the fault signature amount in the 5ms in the earth fault of can accurately sampling;
3. U
0And I
0The match waveform after A/D converter 3 converts digital quantity to, deposit storer 4 in;
4. carry out fault verification through fault verification module 6, with U
0The match first-harmonic as the criterion that protection starts, work as U
0Waveform distorts, and protection starts and judgement I
0, work as I
0Wave form distortion is judged to fault and remembers I
0, calculate I through adjust processor 5 of parameter computing
0Instantaneous phase is worked as I
0Phase change promptly is judged to faulty line after surpassing the logic definite value.
With reference to Fig. 2, said fault verification module 6 is worked as I
0Wave form distortion is judged to fault and latchs U
0And I
0Waveform calculates I through adjust processor 5 of parameter computing
0Amplitude and I
0With U
0Instantaneous phase and phase differential.Said I
0It is I that phase change surpasses the logic definite value
0Direction takes place reverse, transfers to by bus sensing circuit from pointed to bus by circuit.
An above-mentioned embodiment that is merely the utility model, but the design concept of the utility model is not limited thereto allly utilizes this design that the utility model is carried out the change of unsubstantiality, all should belong to the behavior of invading the utility model protection domain.
Claims (3)
1. be used to differentiate demarcation switch intelligent terminal on the post of one-phase earthing failure in electric distribution network, it is characterized in that: include:
Be used to gather the data acquisition module of bus three-phase voltage and this circuit zero-sequence current;
Be used for the analog quantity of data collecting module collected is carried out the electronic type wave filter of figure match, this electronic type is filter-incorporated to have fuzzy data window figure fitting algorithm;
A/D converter;
Storer;
From storer, transfer data and carry out the parameters calculated computing processor of adjusting;
Circuit is carried out the fault verification module of fault verification.
2. demarcation switch intelligent terminal on the post that is used to differentiate one-phase earthing failure in electric distribution network as claimed in claim 1; It is characterized in that: said data acquisition module is connected in the signal input part of electronic type wave filter; The signal output part of said electronic type wave filter is connected in the signal input part of A/D converter; The signal output part of said A/D converter is connected in storer, and adjust processor and fault verification module of said parameter computing is connected in storer.
3. demarcation switch intelligent terminal on the post that is used to differentiate one-phase earthing failure in electric distribution network as claimed in claim 1 is characterized in that: said fault verification module is connected by the motor-operating mechanism of demarcation switch on a folding control module and the post.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204699407U CN202404194U (en) | 2011-11-23 | 2011-11-23 | On-pole demarcation switch intelligent terminal used for distinguishing single-phase earth fault of power distribution network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204699407U CN202404194U (en) | 2011-11-23 | 2011-11-23 | On-pole demarcation switch intelligent terminal used for distinguishing single-phase earth fault of power distribution network |
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| Publication Number | Publication Date |
|---|---|
| CN202404194U true CN202404194U (en) | 2012-08-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011204699407U Expired - Fee Related CN202404194U (en) | 2011-11-23 | 2011-11-23 | On-pole demarcation switch intelligent terminal used for distinguishing single-phase earth fault of power distribution network |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727990A (en) * | 2017-10-23 | 2018-02-23 | 云南电网有限责任公司电力科学研究院 | A kind of distribution arc grounding fault identification method |
-
2011
- 2011-11-23 CN CN2011204699407U patent/CN202404194U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107727990A (en) * | 2017-10-23 | 2018-02-23 | 云南电网有限责任公司电力科学研究院 | A kind of distribution arc grounding fault identification method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 362000 Qixing Industrial Park, Jiangnan hi tech electronic Park, Licheng District, Fujian, Quanzhou Co-patentee after: Kang Xiaosong Patentee after: Seven Star Electric Limited by Share Ltd Address before: 362000 Qixing Industrial Park, Jiangnan hi tech electronic Park, Licheng District, Fujian, Quanzhou Co-patentee before: Kang Xiaosong Patentee before: Quanzhou Sevenstars Electric Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120829 Termination date: 20171123 |