CN203553899U - Neutral point-mounted electronic-type fast resonance elimination device - Google Patents
Neutral point-mounted electronic-type fast resonance elimination device Download PDFInfo
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- CN203553899U CN203553899U CN201320757436.6U CN201320757436U CN203553899U CN 203553899 U CN203553899 U CN 203553899U CN 201320757436 U CN201320757436 U CN 201320757436U CN 203553899 U CN203553899 U CN 203553899U
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Abstract
The utility model discloses a neutral point-mounted electronic-type fast resonance elimination device. The neutral point-mounted electronic-type fast resonance elimination device includes a switching device DK, an electronic control device KZQ and a signal collection device CG; the switching device DK is used for obstructing zero sequence current such that the development of resonance can be inhibited; the electronic control device KZQ is used for collecting and judging the operating states of a system; when resonance occurs in the system, the electronic control device KZQ immediately transmits an action instruction to the switching device so as to make the switching device disconnected temporarily, such that the resonance fault can be eliminated, and at the same time, the electronic control device KZQ records fault information and transmits action states to a management machine; and the signal collection device CG transmits collected zero sequence current signals to the electronic control device such that the electronic control device can judge the operating states based on the zero sequence current signals. The neutral point-mounted electronic-type fast resonance elimination device of the utility model has a wide application range. The neutral point-mounted electronic-type fast resonance elimination device can immediately eliminate resonance rapidly and reliably which is caused by any reasons, and no adverse effects will be exerted on the system, and a voltage transformer can be effectively protected. The neutral point-mounted electronic-type fast resonance elimination device has the advantages of simple structure, convenient operation, high reliability and low cost.
Description
Technical field
The utility model relates to the protective device of eliminating electric power system nonlinear resonance; one is arranged on neutral point of voltage transformer specifically; adopt Electronic Control; switching regulator harmonic elimination apparatus; it can eliminate the various nonlinear resonance faults of electric power system fast, can also protect voltage transformer simultaneously.
background technology
The intermediate voltage electric power system of China adopts neutral non-effective grounding mode mostly, this system has higher power supply reliability, but overvoltage is relatively serious, particularly because of the nonlinear resonance of the saturated generation of voltage transformer, common especially, not only amplitude is higher for it, and energy is very large, and can spread all over whole electrical network, destructiveness is very large, once overvoltage occurs, often cause damage and the large-area power outage of electric equipment.Record and the accident analysis of electrical production operation for many years show, in Medial & Low Voltage Power Network, Overvoltage great majority are all caused by resonance phenomena.
Nonlinear resonance is mainly owing to being subject to external drive; make electromagnetic potential transformer saturated; cause zero sequence oscillation circuit; produce very high resonance overvoltage; zero sequence loop also produces larger zero-sequence current simultaneously; this electric current forms loop through voltage transformer neutral point and electrical network; because of the capacity of voltage transformer very little; larger zero-sequence current can make voltage transformer burn; because resonance overvoltage is longer action time; cause that the reason of resonance phenomena is a lot of again, therefore selecting aspect safeguard measure to cause very large difficulty.
Eliminate at present the most frequently used method of resonance and mainly contain following two kinds: the one, short circuit voltage transformer secondary opening winding in short-term, by consuming resonant energy, thereby make the disappearance that decays gradually of resonance intensity, although the method is simple, but reliability is poor, if phylogenetic resonance is low-frequency resonant, harmonic elimination difficulty is larger, can not protect voltage transformer simultaneously, in harmonic elimination, voltage transformer burns phenomenon and happens occasionally, particularly such harmonic elimination apparatus is all to adopt residual voltage as criterion, be difficult to distinguish the difference of resonance and ground connection, erroneous judgement often occurs, bring many troubles to on-the-spot operation, the 2nd, the resistance (linearity or nonlinear resistance) of connecting between over the ground at a neutral point of voltage transformer, object is to increase the reactance that zero sequence is returned, zero-sequence current is carried out to damping, although the method can be protected voltage transformer, but the certainty of measurement on voltage transformer has impact, during another External System generation single phase ground fault, resonance eliminator is due to self finite capacity, usually can occur self to burn fault, the resonance current particularly producing when system is when larger, on resonance eliminator, can produce very high voltage, the insulation of voltage transformer neutral point is formed and threatened.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of quick harmonic elimination apparatus of electronic type; one be arranged on voltage transformer neutral point over the ground between; can eliminate fast various resonance faults; can also protect voltage transformer simultaneously; simple in structure; harmonic elimination apparatus with low cost, operational reliability is high.
For addressing the above problem, the technical solution of the utility model is:
The quick harmonic elimination apparatus of a kind of electronic type, includes switching device DK, electronic-controlled installation KZQ and signal pickup assembly CG.It is characterized in that:
Described switching device DK can adopt mechanical switching device, also can adopt the electronic switch device consisting of power electronics, but this switching device must tolerate institute's application system single-phase voltage intensity.Being applied as of described switching device be connected on voltage transformer over the ground between, the upper end of switching device is connected with a neutral point of voltage transformer, lower end is connected with ground.During normal operation, switching device, in combined floodgate conducting state, guarantees the accurate of voltage transformer metering, when system has resonance to occur, disconnect immediately, zero-sequence current is cut off, thus the development of inhibition resonance, after resonance disappears, switching device is closed again, guarantees the normal operation of system.
Described neutral point is installed the quick harmonic elimination apparatus of electronic type, it is characterized in that: described electronic-controlled installation can be realized by Digital Logical Circuits or single-chip microcomputer, the running status of system is gathered and judged, when system generation resonance, to switching device, send action command immediately, make switching device disconnect in short-term, by resonance Failure elimination, fault message is carried out to record simultaneously, and by operate condition communication communication to supervisor.
Described neutral point is installed the quick harmonic elimination apparatus of electronic type, it is characterized in that: described signal pickup assembly is comprised of current transformer or sampling resistor etc., be connected in neutral ground loop of voltage transformer, when system generation resonance, voltage transformer neutral point will flow through larger zero-sequence current, signal pickup assembly, by the zero sequence current signal collecting, is delivered in electronic-controlled installation, the judgement for electronic-controlled installation to running status.
For protection switch device and instrument transformer neutral point; prevent that switching device from cut-offfing rear voltage transformer neutral point and producing higher voltage hazardous voltages instrument transformer and the insulation safety of switching device, can be at the two ends of switching device parallel connection one resistance (linear or non-linear) or electric capacity.
The beneficial effects of the utility model:
Signal pickup assembly of the present utility model directly gathers zero-sequence current; principle science, method are simple and reliable; when system generation resonance fault; by switching device, directly zero-sequence current is cut off, no matter be the resonance what reason produces, all can be eliminated immediately; reliable rapidly; to system, without any harmful effect, and can effectively protect voltage transformer, have advantages of simple in structure, operation is convenient, reliability is high, with low cost.
Accompanying drawing explanation
Fig. 1 is the utility model structural representation
Fig. 2 is the protective circuit structural representation of the utility model switching device
In figure: 1 is electronic-controlled installation KZQ; 2 is switching device DK; 3 is signal pickup assembly CG; 4 is voltage transformer pt; 5 is power supply; 6 is communication; 7 is actuating signal loop; 8 return for unit state signal.
Embodiment
Referring to Fig. 1, Fig. 2, a kind of neutral point is installed the quick harmonic elimination apparatus of electronic type, includes switching device DK2, electronic-controlled installation KZQ1 and signal pickup assembly CG3.
Described switching device DK2 is installed in series between 4 neutral points of voltage transformer pt and signal pickup assembly CG3, upper end is connected to 4 neutral points of voltage transformer pt, lower end is connected serially on the upper terminal of signal pickup assembly CG3, it can adopt mechanical switch, also can adopt electronic switch, require switching device DK2 to there is the specified single-phase voltage strength capabilities of tolerance institute's application system.When system is normally moved, switching device DK2 is in closed conducting state, guarantee the accurate-metering of voltage transformer pt 4, when system generation resonance fault, cut-off in short-term immediately, the zero sequence power supply 5 that system resonance is produced is blocked, and resonance is eliminated fast, at this moment switching device DK2 is again closed, and system is recovered normal operation.
Signal pickup assembly CG3 be installed in series switching device DK2 over the ground between, its upper end is connected with the lower end of switching device DK2, the direct ground connection in lower end, its effect is that the zero-sequence current of system is detected and gathered, when system generation resonance, can produce zero-sequence current in to earth-return at neutral point of voltage transformer, signal pickup assembly CG3 is transported to the zero-sequence current collecting in electronic-controlled installation KZQ1 immediately, and for electronic-controlled installation, KZQ1 judges system running state.Signal pickup assembly CG3 can adopt current transformer, also can adopt resistance-type shunt, as adopted electronic type shunt as signal pickup assembly, need select resistance less, not affect voltage transformer pt certainty of measurement, is advisable.
Electronic-controlled installation KZQ1 is the intelligent cell of whole device, the signal on the one hand signal pickup assembly CG3 being sent carries out analyzing and processing and judgement, also to control power supply 5 switching devices in addition, the information such as the action situation of zero-sequence current, system running state and switching device DK2 are recorded (unit state signal return 8 and actuating signal loop 7), and communication 6 is to upper managing computer simultaneously.Electronic-controlled installation KZQ1 can be realized by Digital Logic short circuit or single-chip microcomputer.
Claims (5)
1. a neutral point is installed the quick harmonic elimination apparatus of electronic type, include switching device, electronic-controlled installation and signal pickup assembly, it is characterized in that: resonance eliminator be arranged on voltage transformer over the ground between, signal pickup assembly is sent to electronic-controlled installation by the zero sequence current signal collecting, by electronic-controlled installation, the running status of system is judged, when system resonance, electronic-controlled installation sends and cut-offs in short-term instruction to switching device, makes resonance fault eliminate fast.
2. neutral point according to claim 1 is installed the quick harmonic elimination apparatus of electronic type, it is characterized in that: described switching device is mechanical switch.
3. neutral point according to claim 1 is installed the quick harmonic elimination apparatus of electronic type, it is characterized in that: described switching device is electronic switch.
4. neutral point according to claim 1 is installed the quick harmonic elimination apparatus of electronic type, it is characterized in that: described signal pickup assembly is current transformer.
5. neutral point according to claim 1 is installed the quick harmonic elimination apparatus of electronic type, it is characterized in that: described signal pickup assembly is resistance-type shunt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320757436.6U CN203553899U (en) | 2013-11-27 | 2013-11-27 | Neutral point-mounted electronic-type fast resonance elimination device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320757436.6U CN203553899U (en) | 2013-11-27 | 2013-11-27 | Neutral point-mounted electronic-type fast resonance elimination device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203553899U true CN203553899U (en) | 2014-04-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320757436.6U Expired - Fee Related CN203553899U (en) | 2013-11-27 | 2013-11-27 | Neutral point-mounted electronic-type fast resonance elimination device |
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| CN (1) | CN203553899U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606887A (en) * | 2013-11-27 | 2014-02-26 | 安徽泰隆电气有限公司 | Electronic rapid resonance elimination device installed at neutral point |
-
2013
- 2013-11-27 CN CN201320757436.6U patent/CN203553899U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103606887A (en) * | 2013-11-27 | 2014-02-26 | 安徽泰隆电气有限公司 | Electronic rapid resonance elimination device installed at neutral point |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140416 Termination date: 20181127 |
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| CF01 | Termination of patent right due to non-payment of annual fee |