CN203217034U - Grounding fault positioning system for power distribution network - Google Patents
Grounding fault positioning system for power distribution network Download PDFInfo
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- CN203217034U CN203217034U CN 201320148127 CN201320148127U CN203217034U CN 203217034 U CN203217034 U CN 203217034U CN 201320148127 CN201320148127 CN 201320148127 CN 201320148127 U CN201320148127 U CN 201320148127U CN 203217034 U CN203217034 U CN 203217034U
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Abstract
The utility model discloses a grounding fault positioning system for a power distribution network. The grounding fault positioning system comprises a grounding line selection device, an even harmonic signal source for connecting a neutral point, a computer, a plurality of concentrators and a plurality of fault indicators. The grounding line selection device is connected to a bus and the even harmonic signal source. The computer is connected to the grounding line selection device by the Ethernet on one hand, and is wirelessly connected to each concentrator by a GPRS network on the other hand. Each fault indicator is subordinated to one of the concentrators, and is wirelessly connected to the concentrator directly, or is indirectly connected to the concentrator by another fault indicator subordinated to the concentrator in a manner of wireless cascading. The grounding fault positioning system provided by the utility model is capable of performing fault positioning effectively for a neutral point effective grounding system and a neutral point non-effective grounding system.
Description
Technical field
The utility model relates to the electric network fault location, relates in particular to a kind of earth fault positioning system for power distribution network.
Background technology
Along with the propelling of intelligent grid, the demand that grid company is included the mesolow electric line in monitoring range is more and more stronger.Statistics shows, 70% fault is caused by ground connection in the 10kV distribution network failure, so the accurate judgement for earth fault is very important with the development of locating following electrical network, generally be divided into the route selection of earth fault and definite two aspects of grounding fault point position.
At present, for the route selection problem of earth fault, people have passed through the research of long period, have also proposed a lot of methods in theory.Though no problem substantially for system with effectively earthed neutral, for system with non-effectively earthed neutral, its feasibility is little desirable in actual applications, especially for the system of grounding through arc, the difficulty of route selection is bigger.
For determining of grounding fault point position, what present domestic use was more is the mechanical type fault detector, and its function is simple, can only tackle short trouble, and is helpless for earth fault, and must cooperate artificial line walking could determine abort situation.Though, begin to adopt intelligentized electronic type fault detector abroad.But because the general node of power distribution network is many, branch is many, the method for operation is complicated, so how constructing communication network also has considerable influence for localization of fault to the electronic type fault detector.For non-effectively earthed system, the main signal injection method that adopts positions at present, but specifically adopts which type of signal also to need further investigation in addition.
Therefore, for the research and development of new and effective earth fault positioning system, be the direction that the applicant is devoted to make great efforts.
Summary of the invention
The purpose of this utility model is to provide a kind of earth fault positioning system for power distribution network, realization is carried out localization of fault effectively to neutral point effective grounding and non-effectively earthed system, superior performance, be convenient to expansion, be specially adapted to the fault diagnosis of this class system with non-effectively earthed neutral of 10kV power distribution network.
The technical scheme that realizes above-mentioned purpose is:
A kind of earth fault positioning system for power distribution network, some outlets that described power distribution network comprises bus, draw from bus and the neutral point of connection bus, described earth fault positioning system comprises that even harmonics signal source, computing machine, some concentrators and the distribution of earthing wire-selecting equipment, the described neutral point of connection are installed in the some fault detectors in each outlet, wherein:
Described earthing wire-selecting equipment connects described bus and even harmonics signal source;
Described computing machine connects described earthing wire-selecting equipment by Ethernet on the one hand, on the other hand by described each concentrator of GPRS network wireless connections;
Each fault detector is subordinated to a described concentrator, or directly wireless connections or are connected in this concentrator in the mode of wireless cascade by the fault detector that other are subordinated to this concentrator indirectly in this concentrator.
The above-mentioned earth fault positioning system that is used for power distribution network, wherein, described even harmonics signal source comprises arc suppression coil, switch, resistance and diode, wherein:
Described arc suppression coil one end connects described neutral point, other end ground connection;
Described switch connects described neutral point and resistance;
Described resistance connects the negative pole of described diode, the plus earth of described diode;
Described earthing wire-selecting equipment connects described switch, controls the break-make of this switch.
The above-mentioned earth fault positioning system that is used for power distribution network, wherein, described even harmonics signal source comprises that also one connects the signal source of the positive pole of described diode.
The above-mentioned earth fault positioning system that is used for power distribution network, wherein, described computing machine inserts GPRS network by the GPRS module.
The beneficial effects of the utility model are: the utility model is by the reasonable disposition of earthing wire-selecting equipment, computing machine, concentrator and fault detector, no matter for the neutral point effective grounding, still non-effectively earthed system all can carry out localization of fault effectively, and real-time and accuracy are higher; Simultaneously, the mode of the utility model by wireless cascade realizes communicating by letter of each fault detector and concentrator, be convenient to expansion, be specially adapted to the fault diagnosis of this class system with non-effectively earthed neutral of 10kV power distribution network, and can realize the real-time monitoring to transmission and distribution networks.
Description of drawings
Fig. 1 is the structural representation of the earth fault positioning system for power distribution network of the present utility model;
Fig. 2 is the current waveform figure in the fault loop before and after diode drops in the utility model;
Fig. 3 be in the utility model after fault loop is injected even-order harmonic spectrum analysis figure.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
See also Fig. 1, the earth fault positioning system for power distribution network of the present utility model, some outlets that power distribution network comprises bus 101, draw from bus 101 (1#, 2#...n#, n 〉=2 and be positive integer) and the neutral point 102 of connection bus 101;
Earth fault positioning system of the present utility model comprises earthing wire-selecting equipment 201, computing machine 202, some concentrators 203, distributing is installed in each outlet (1#, 2#...n#) on some fault detectors 204 and the even harmonics signal source 205 that connects neutral point 102, wherein:
Even harmonics signal source 205 comprises arc suppression coil L, K switch, resistance R, diode D and signal source (not shown), and wherein: arc suppression coil L one end connects neutral point 102, other end ground connection; K switch connects neutral point 102 and resistance R; Resistance R connects the negative pole of diode D; The plus earth of diode D, and receive the signal that described signal source (not shown) sends;
Earthing wire-selecting equipment 201 connection buss 101 and even harmonics signal source 205(be namely: be connected K switch, in order to control the break-make of this K switch), earthing wire-selecting equipment 201 is gathered residual voltage and zero-sequence current from bus 101, thereby judge the outlet that earth fault takes place (1# or 2# or ... n#), by Ethernet notice computing machine 202;
As shown in Figure 1, each fault detector 204 is subordinated to a concentrator 203, this fault detector 204 or direct wireless connections are in this concentrator 203, and perhaps the mode with wireless cascade is connected in this concentrator 203 indirectly by other fault detectors 204 that are subordinated to this concentrator 203;
Computing machine 202 connects earthing wire-selecting equipment 201 by Ethernet, and simultaneously by each concentrator 203 of GPRS network (not shown) wireless connections, namely computing machine 202 at first inserts GPRS network by GPRS module (not shown); Computing machine 202 on the one hand successively by GPRS network and take place earth fault outlet (1# or 2# or ... all concentrators 203 n#), notice take place earth fault outlet (1# or 2# or ... all fault detectors 204 n#) are gathered even-order harmonic electric currents; Computing machine 202 is connected by Ethernet notice earthing wire-selecting equipment 201 control even harmonics signal sources 205 on the other hand, that is: gauge tap K closure, thus drop into even harmonics signal source 205; Afterwards, computing machine 202 outlet by earth fault takes place successively (1# or 2# or ... n#) go up all concentrators 203 and GPRS network (not shown), receive to take place earth fault outlet (1# or 2# or ... the even-order harmonic electric current that all fault detectors 204 n#) are gathered, by judging the separation of even-order harmonic amplitude, judge earth fault and occur between any two fault detectors 204, realize localization of fault.
In the present embodiment, the model that earthing wire-selecting equipment 201 is selected for use is ZXJ-II; The model that concentrator 203 is selected for use is CTRLAB-FD01A; The model that fault detector 204 is selected for use is CTRLAB-FD02; Resistance R is middle resistance.
Particularly, the utility model utilizes the single-phase conduction of diode D to inject this asymmetrical signals of even-order harmonic to neutral point 102 and realizes localization of fault.Concrete signal injecting principle as shown in Figure 1.Earthing wire-selecting equipment 201 determine any bar outlet (1# or 2# or ... n#) earth fault takes place after, drop into resistance R and diode D in system neutral 102, at this moment faulty line and neutral point 102 form the loop by the earth, because the unidirectional conduction of diode, significant change will take place in the current waveform in the fault loop, as shown in Figure 2.Normal power network signal for generally all satisfy relational expression: f (x+ π)=-f (x); Therefore, the even-order harmonic component is all very little in the electrical network.But because the adding of diode D makes that the positive and negative half-wave in the fault loop is obviously different, so the component of even-order harmonic will increase greatly, so also just produces a characteristic current signal that obviously is different from the electrical network normal current in the loop.As long as we calculate the place that the size of second harmonic content in the electric current just can be judged earth fault.Fault detector before the trouble spot is in the fault loop, so second harmonic is bigger, and the fault detector behind the trouble spot is in outside the fault loop, and second harmonic is less.Just can judge that by the separation of this harmonic wave earth fault between which two fault detector, has realized localization of fault.Fig. 3 is reality spectrum analysis figure after fault loop is injected even-order harmonic, can see that the interior second harmonic of fault loop is obviously greater than outside the fault loop.Therefore, the utility model is rationally feasible.
Above embodiment is only for the usefulness that the utility model is described, but not to restriction of the present utility model, person skilled in the relevant technique, under the situation that does not break away from spirit and scope of the present utility model, can also make various conversion or modification, therefore all technical schemes that are equal to also should belong to category of the present utility model, should be limited by each claim.
Claims (4)
1. earth fault positioning system that is used for power distribution network, some outlets that described power distribution network comprises bus, draw from bus and the neutral point of connection bus, it is characterized in that, described earth fault positioning system comprises that even harmonics signal source, computing machine, some concentrators and the distribution of earthing wire-selecting equipment, the described neutral point of connection are installed in the some fault detectors in each outlet, wherein:
Described earthing wire-selecting equipment connects described bus and even harmonics signal source;
Described computing machine connects described earthing wire-selecting equipment by Ethernet on the one hand, on the other hand by described each concentrator of GPRS network wireless connections;
Each fault detector is subordinated to a described concentrator, or directly wireless connections or are connected in this concentrator in the mode of wireless cascade by the fault detector that other are subordinated to this concentrator indirectly in this concentrator.
2. the earth fault positioning system for power distribution network according to claim 1 is characterized in that, described even harmonics signal source comprises arc suppression coil, switch, resistance and diode, wherein:
Described arc suppression coil one end connects described neutral point, other end ground connection;
Described switch connects described neutral point and resistance;
Described resistance connects the negative pole of described diode, the plus earth of described diode;
Described earthing wire-selecting equipment connects described switch, controls the break-make of this switch.
3. the earth fault positioning system for power distribution network according to claim 2 is characterized in that, described even harmonics signal source comprises that also one connects the signal source of the positive pole of described diode.
4. the earth fault positioning system for power distribution network according to claim 1 is characterized in that, described computing machine inserts GPRS network by the GPRS module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320148127 CN203217034U (en) | 2013-03-28 | 2013-03-28 | Grounding fault positioning system for power distribution network |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320148127 CN203217034U (en) | 2013-03-28 | 2013-03-28 | Grounding fault positioning system for power distribution network |
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| CN203217034U true CN203217034U (en) | 2013-09-25 |
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| CN 201320148127 Expired - Lifetime CN203217034U (en) | 2013-03-28 | 2013-03-28 | Grounding fault positioning system for power distribution network |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103176109A (en) * | 2013-03-28 | 2013-06-26 | 国家电网公司 | Earth fault locating system for power distribution network |
| CN103983851A (en) * | 2014-05-22 | 2014-08-13 | 河海大学 | Active power distribution network harmonic source positioning analysis method |
| CN104267301A (en) * | 2014-10-27 | 2015-01-07 | 江苏省电力公司常州供电公司 | Acquisition and Control system for electricity utilization information of electricity consumers |
-
2013
- 2013-03-28 CN CN 201320148127 patent/CN203217034U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103176109A (en) * | 2013-03-28 | 2013-06-26 | 国家电网公司 | Earth fault locating system for power distribution network |
| CN103983851A (en) * | 2014-05-22 | 2014-08-13 | 河海大学 | Active power distribution network harmonic source positioning analysis method |
| CN103983851B (en) * | 2014-05-22 | 2016-08-31 | 河海大学 | Active distribution network harmonic source location analyzes method |
| CN104267301A (en) * | 2014-10-27 | 2015-01-07 | 江苏省电力公司常州供电公司 | Acquisition and Control system for electricity utilization information of electricity consumers |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130925 |