CN102290805A - Electric arc grounding overvoltage limiting device applied to medium-voltage distribution system - Google Patents
Electric arc grounding overvoltage limiting device applied to medium-voltage distribution system Download PDFInfo
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- CN102290805A CN102290805A CN2011102318744A CN201110231874A CN102290805A CN 102290805 A CN102290805 A CN 102290805A CN 2011102318744 A CN2011102318744 A CN 2011102318744A CN 201110231874 A CN201110231874 A CN 201110231874A CN 102290805 A CN102290805 A CN 102290805A
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Abstract
The invention discloses an electric arc grounding overvoltage limiting device applied to a medium-voltage distribution system. The electric arc grounding overvoltage limiting device applied to the medium-voltage distribution system comprises single-phase quick electronic switches which are controlled by an intelligent controller, and a high-energy nano zinc oxide energy-absorbing and extinguishing device, wherein three single-phase quick electronic switches are provided and main loops of the three single-phase quick electronic switches are connected in a star-like way; three high-voltage wire connecting ends of the three single-phase quick electronic switches are connected with a three-phase bus bar of the system and the other ends of the three single-phase quick electronic switches are connected in parallel and connected on the upper end head of the high-energy nano zinc oxide energy-absorbing and extinguishing device; the high-energy nano zinc oxide energy-absorbing and extinguishing device consists of a high-energy nano zinc oxide linear resistor, a nano damping absorber, a high-energy nano zinc oxide non-linear resistor and a high-voltage controllable silicone; and the high-voltage controllable silicone is connected at two ends of the high-energy nano zinc oxide non-linear resistor and the nano damping absorber respectively in parallel. Compared with the prior art, the electric arc grounding overvoltage limiting device applied to the medium-voltage distribution system has the advantage that: 3-35KV neutral point non-direct grounding power grid can effectively limit single-phase intermittent electric arc grounding overvoltage in various running ways.
Description
Technical field
The present invention relates to overvoltage Limiting field in the intermediate distribution system, exactly be meant a kind of arcing ground over-voltage limitation means that is applied to intermediate distribution system.
Background technology
In the intermediate distribution system, especially mesohigh power transmission and distribution electric power system (3-35KV) mostly adopts system with non effectively earth ed neutral.In system with non effectively earth ed neutral, except that lightning overvoltage, the most frequent by the overvoltage that single-phase earthing electric arc causes, and this class overvoltage has higher amplitude and long duration, if such overvoltage can not effectively limit, will produce the damage of accumulation property to the electricity supply and use equipment in this class electrical network, and may cause generation puncture or alternate flashover over the ground, thereby cause short circuit accident etc. in the external insulation weak spot.
At present, the major measure of restriction arc light grounding surge is still neutral point of electric network through grounding through arc.But arc suppression coil can not be eliminated intermittent arcing ground over-voltage, amplitude that can not over-voltage, even in some cases, because of the existence of arc suppression coil, arc reignition may just take place constantly at maximum this least favorable of recovery voltage, and the arc grounding overvoltage is raise.High fdrequency component and the real component of arc suppression coil in can not the compensation of ground electric current, the indirect arc ground connection of high frequency still exists; During greater than certain value, the fault point ground arc can not put out equally certainly in real component.Arc suppression coil cuts little ice to the overvoltage that causes of restriction resonance, and very likely causes ferro resonance when residual voltage and zero-sequence current appear in broken string or high-pressure side.Practical operating experiences proves that also in the 3-35kv of neutral by arc extinction coil grounding power distribution network, the accident that causes because of the electric arc overvoltage happens occasionally.
The patent No. is that the Chinese patent of 99229228.x discloses a kind of " Triphase Power Networks And Indirect Earthing System Overvoltage Debooster ".It has taked to change intermittent arcing ground the directly grounded extinguishing arc measure of into bus metallicity, but this overvoltage limiter causes impact to system in the moment of busbar grounding and disconnection, particularly disconnect the transient overvoltage of earth bus moment generation, make in insulation level decline and still may take place once more by the single-phase indirect arc ground connection that the overvoltage impact causes, and after ground connection disconnects, stored charge unnecessary on the sound electric capacity relatively will be by the winding discharge of instrument transformer, cause the moment magnetic saturation of winding, still can excite ferro resonance.
In addition, abroad (domestic also have minority area begin adopt) take neutral point to suppress this overvoltage to this type of electrical network through low resistance grounding, but single-phase earthing when taking place in this system, no matter single phase ground fault is moment, or nonvolatil, all directly the fault earthing circuit is excised, and the operating experience of electric power system shows, the single phase ground fault overwhelming majority is moment, the electrical network that constitutes of overhead transmission line particularly, must cause sharply increasing of power outage like this, obviously reduce power supply reliability.
Summary of the invention
At above-mentioned defective, the technical problem that the present invention solves is to provide a kind of arcing ground over-voltage limitation means that is applied to intermediate distribution system, can make the 3-35KV neutral nondirect earthing network under various operational modes, all can effectively limit the single phase intermittent arcing ground over-voltage.
In order to solve above technical problem, the arcing ground over-voltage limitation means that is applied to intermediate distribution system provided by the invention comprises by the single-phase high-speed electronic switch of intelligent controller control and the high energy nano zine oxide energy-absorbing arc-control device of being controlled by intelligent controller;
Described single-phase high-speed electronic switch is three, the major loop of three described single-phase high-speed electronic switchs is star-like connection, wherein three high-voltage terminals are connected to respectively on system's three-phase bus, and an other end is connected in parallel and is connected on described high energy nano zine oxide energy-absorbing arc-control device upper end;
Described high energy nano zine oxide energy-absorbing arc-control device is made up of high energy ZnO linear resistance, nanometer damping absorber and high energy ZnO nonlinear resistance and a high-voltage thyristor, wherein, described high-voltage thyristor is connected in parallel on described high energy ZnO nonlinear resistance and described nanometer damping absorber two ends.
More preferably, the described arcing ground over-voltage limitation means that is applied to intermediate distribution system also comprises the voltage transformer that is connected between three-phase bus and the described intelligent controller input, is used for the input signal of the voltage signal of acquisition system as described intelligent controller.
More preferably, the secondary sideband of described voltage transformer has auxiliary winding, and described auxiliary winding connects into the open delta winding, and described open delta winding is connected to the signal input part of described intelligent controller.
More preferably, described voltage transformer is made up of three single-phase potential transformers, the star-like connection all adopted with the secondary limit in a limit of three described single-phase potential transformers, and the auxiliary winding triangle of the three-phase on described secondary limit does not connect but be closed and form the open delta winding.
More preferably, described intelligent controller with single-chip microcomputer as hardcore.
More preferably, the described arcing ground over-voltage limitation means that is applied to intermediate distribution system also comprises high voltage isolator, is connected with electric power system.
More preferably, the described arcing ground over-voltage limitation means that is applied to intermediate distribution system also comprises the high-tension fuse of protected location in support.
More preferably, the described arcing ground over-voltage limitation means that is applied to intermediate distribution system also comprises the fast acting fuse of protected location in support.
More preferably, the described arcing ground over-voltage limitation means that is applied to intermediate distribution system also comprises the high-tension fuse and the fast acting fuse of protected location in support.
The arcing ground over-voltage limitation means that is applied to intermediate distribution system provided by the invention comprises by the single-phase high-speed electronic switch of intelligent controller control and the high energy nano zine oxide energy-absorbing arc-control device of being controlled by intelligent controller; Single-phase high-speed electronic switch is three, the major loop of three single-phase high-speed electronic switchs is star-like connection, wherein three high-voltage terminals are connected to respectively on system's three-phase bus, and an other end is connected in parallel and is connected on high energy nano zine oxide energy-absorbing arc-control device upper end; High energy nano zine oxide energy-absorbing arc-control device is made up of high energy ZnO linear resistance, nanometer damping absorber and high energy ZnO nonlinear resistance and a high-voltage thyristor, wherein, high-voltage thyristor is connected in parallel on high energy ZnO nonlinear resistance and nanometer damping absorber two ends.Compared with prior art, the arcing ground over-voltage limitation means that is applied to intermediate distribution system provided by the invention, when gap arcing ground takes place in electrical network, the high-speed electronic switch of fault phase is put into arcing ground with high energy nano zine oxide energy-absorbing arc-control device immediately and is gone up mutually, utilize the common high pressure energy-absorbing pressure limiting arc extinguishing antihunt circuit of forming of high energy ZnO linear resistance, nanometer damping absorber and high energy ZnO nonlinear resistance, overvoltage to the arcing ground phase limits and the damping absorption, eliminates system's arc grounding overvoltage; Over the ground directly during arcing ground, intelligent controller sends the high-speed electronic switch of instruction quick-make fault phase and the high-voltage thyristor of high energy nano zine oxide energy-absorbing arc-control device, high energy ZnO nonlinear resistance in the high energy nano zine oxide energy-absorbing arc-control device and nanometer damping absorber are by the high-voltage thyristor short circuit, make fault directly insert the high energy ZnO linear resistance mutually, fault is phase-changed into stable resistive ground connection, utilize good temperature characterisitic of high energy ZnO linear resistance and energy absorption characteristics, the voltage of fault restriction phase, the overvoltage of elimination system.
In addition, the arcing ground over-voltage limitation means that is applied to intermediate distribution system provided by the invention, when intermediate distribution system generation single phase ground fault, intelligent controller is by the state before and after relatively arc-extinction device moves, the zero-sequence current size and the side vector of all circuits, accurately judge the place, fault point of system, solved the technical barrier that the little electric current line selection apparatus of present tradition can't cooperate with arc-extinction device, can accurately select the faulty line of system.
Description of drawings
Fig. 1 is for being applied to the circuit theory diagrams of the arcing ground over-voltage limitation means of intermediate distribution system among the present invention.
Embodiment
For those skilled in the art can understand technical scheme provided by the present invention better, set forth below in conjunction with specific embodiment.
See also Fig. 1, this figure is the circuit theory diagrams that are applied to the arcing ground over-voltage limitation means of intermediate distribution system among the present invention.
The arcing ground over-voltage limitation means that is applied to intermediate distribution system provided by the invention, comprise intelligent controller 1, single-phase high-speed electronic switch 4 and high energy nano zine oxide arc-control device 5, single-phase high-speed electronic switch is three, the main contacts KKA of single-phase high-speed electronic switch, KKB, KKC is star-like connection, wherein three terminations are connected to respectively on the intermediate distribution system three-phase bus, other one terminates on the high energy nano zine oxide energy-absorbing arc-control device 5, high energy nano zine oxide energy-absorbing arc-control device 5 is by high energy ZnO linear resistance RV1, high energy ZnO nonlinear resistance RV2 and nanometer damping absorber and a high-voltage thyristor KKD form, and wherein single-phase high-speed electronic switch KKD is connected in parallel on high energy ZnO nonlinear resistance RV2 and nanometer damping absorber RV3 two ends.
Be connected in the voltage transformer TV between three-phase bus and the intelligent controller input, the secondary sideband of voltage transformer has auxiliary winding, and will assist winding to connect into the open delta winding, and the open delta winding is connected to the signal input part of intelligent controller 1.Voltage transformer TV is made of three single-phase potential transformers, three single-phase potential transformers once all adopt star-like the connection with the secondary limit, the auxiliary winding triangle of the three-phase on secondary limit is not connected but closed and form the open delta winding.The characteristics of this voltage transformer TV are that the range of linearity is wide, phase shift is little, even when in system the most serious arc grounding overvoltage taking place, also can guarantee the amplitude of its output signal and the accuracy of phase place.
It is the hardware configuration (being aided with well-designed software) of core that intelligent controller 1 adopts with the single-chip microcomputer, controls the work of whole device.
High voltage isolator GL as the critical piece that this device is connected with electric power system, can realize the break-make of this device and system by this element.
High-tension fuse 2 as the backup protection unit of this device, is mainly used to protect the safe operation of voltage transformer.
The operation principle of the arcing ground over-voltage limitation means that is applied to intermediate distribution system provided by the invention is as follows:
TV provides actuating signal by voltage transformer, finishes the real-time monitoring to intermediate distribution system.Intelligent controller 1 is under corresponding software is supported, the three-phase voltage that provides according to voltage transformer TV and the variation of residual voltage instantaneous value are judged, and according to the result who judges, send corresponding instruction, make single-phase high-speed electronic switch 4 and be connected in parallel on high energy ZnO nonlinear resistance RV2 and the high-voltage thyristor KKD at nanometer damping absorber two ends action.If because the switching overvoltage that the vacuum switch operation causes, intelligent controller 1 can not send any instruction.When if the indirect arc grounding surge takes place, normally opened contact KKA or the KKB or the KKC of the single-phase high-speed electronic switch by closed fault phase, make fault insert high energy nano zine oxide energy-absorbing arc-control device 5 mutually, the electromagnetic energy that the ground connection of releasing causes, the damping electromagnetic viscosimeter, the recovery voltage of restriction ground connection phase, the fault point is limited lowlyer because of recovery voltage, and electric arc can not be restriked and extinguishing arc.When if stable arcing ground over-voltage takes place, normally opened contact KKA or the KKB or the KKC of the single-phase high-speed electronic switch 4 by closed fault phase and be connected in parallel on the high energy ZnO nonlinear resistance and the controlled high-speed switch KKD of high pressure at nanometer damping absorber two ends, the resistive ground connection that fault is transformed into mutually, thereby the voltage of restriction ground connection phase is eliminated the arc grounding fault.When system's generation single phase ground fault, multifunctional controller is by before and after relatively arc-extinction device moves, the zero-sequence current size of all circuits, accurately judge the place, fault point of system, solve the technical barrier that the little electric current line selection apparatus of present tradition can't cooperate with arc-extinction device, can accurately search the faulty line of system.
Compared with prior art, the arcing ground over-voltage limitation means that is applied to intermediate distribution system provided by the invention, not only can make the 3-35KV neutral nondirect earthing network, under various operational modes, all can effectively limit the single phase intermittent arcing ground over-voltage, and to phylogenetic any earth fault, the size of system capacitive current no matter, all can be correct search faulty line.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be conspicuous concerning those skilled in the art, and defined herein General Principle can realize under the situation that does not break away from the spirit or scope of the present invention in other embodiments.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet and principle disclosed herein and features of novelty the wideest corresponding to scope.
Claims (9)
1. an arcing ground over-voltage limitation means that is applied to intermediate distribution system is characterized in that, comprises by the single-phase high-speed electronic switch of intelligent controller control and the high energy nano zine oxide energy-absorbing arc-control device of being controlled by intelligent controller;
Described single-phase high-speed electronic switch is three, the major loop of three described single-phase high-speed electronic switchs is star-like connection, wherein three high-voltage terminals are connected to respectively on system's three-phase bus, and an other end is connected in parallel and is connected on described high energy nano zine oxide energy-absorbing arc-control device upper end;
Described high energy nano zine oxide energy-absorbing arc-control device is made up of high energy ZnO linear resistance, nanometer damping absorber and high energy ZnO nonlinear resistance and a high-voltage thyristor, wherein, described high-voltage thyristor is connected in parallel on described high energy ZnO nonlinear resistance and described nanometer damping absorber two ends.
2. the arcing ground over-voltage limitation means that is applied to intermediate distribution system according to claim 1, it is characterized in that, also comprise the voltage transformer that is connected between three-phase bus and the described intelligent controller input, be used for the input signal of the voltage signal of acquisition system as described intelligent controller.
3. the arcing ground over-voltage limitation means that is applied to intermediate distribution system according to claim 2, it is characterized in that, the secondary sideband of described voltage transformer has auxiliary winding, described auxiliary winding connects into the open delta winding, and described open delta winding is connected to the signal input part of described intelligent controller.
4. the arcing ground over-voltage limitation means that is applied to intermediate distribution system according to claim 3, it is characterized in that, described voltage transformer is made up of three single-phase potential transformers, the star-like connection all adopted with the secondary limit in a limit of three described single-phase potential transformers, and the auxiliary winding triangle of the three-phase on described secondary limit does not connect but be closed and form the open delta winding.
5. the arcing ground over-voltage limitation means that is applied to intermediate distribution system according to claim 1 is characterized in that, described intelligent controller with single-chip microcomputer as hardcore.
6. the arcing ground over-voltage limitation means that is applied to intermediate distribution system according to claim 1 is characterized in that, also comprises high voltage isolator, is connected with electric power system.
7. the arcing ground over-voltage limitation means that is applied to intermediate distribution system according to claim 1 is characterized in that, also comprises the high-tension fuse of protected location in support.
8. the arcing ground over-voltage limitation means that is applied to intermediate distribution system according to claim 1 is characterized in that, also comprises the fast acting fuse of protected location in support.
9. the arcing ground over-voltage limitation means that is applied to intermediate distribution system according to claim 1 is characterized in that, also comprises the high-tension fuse and the fast acting fuse of protected location in support.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011102318744A CN102290805A (en) | 2011-08-12 | 2011-08-12 | Electric arc grounding overvoltage limiting device applied to medium-voltage distribution system |
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| CN2011102318744A CN102290805A (en) | 2011-08-12 | 2011-08-12 | Electric arc grounding overvoltage limiting device applied to medium-voltage distribution system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103474982A (en) * | 2013-09-29 | 2013-12-25 | 安徽一天电气技术有限公司 | Arc extinction device for eliminating interphase short circuit in single-resistance method |
| CN103545796A (en) * | 2013-09-16 | 2014-01-29 | 国家电网公司 | Single-phase grounding fault handling device and method for power distribution network with non-effectively grounded neutral points |
| CN104935142A (en) * | 2015-05-31 | 2015-09-23 | 郭富强 | DC motor and application thereof |
| CN107332226A (en) * | 2017-08-29 | 2017-11-07 | 安徽三和电力技术有限公司 | Overvoltage suppressing system based on intelligent switch |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1695447A1 (en) * | 1989-04-04 | 1991-11-30 | Донецкий политехнический институт | Device for automatic adjustment of arc-controlling coils |
| CN200953472Y (en) * | 2006-10-10 | 2007-09-26 | 杜志庭 | Electric power transmitting and distributing system arc light over-voltage comprehensive limiting device |
| CN201260077Y (en) * | 2008-09-03 | 2009-06-17 | 魏福道 | Arc extinguishing device grounded through high frequency damp element |
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2011
- 2011-08-12 CN CN2011102318744A patent/CN102290805A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU1695447A1 (en) * | 1989-04-04 | 1991-11-30 | Донецкий политехнический институт | Device for automatic adjustment of arc-controlling coils |
| CN200953472Y (en) * | 2006-10-10 | 2007-09-26 | 杜志庭 | Electric power transmitting and distributing system arc light over-voltage comprehensive limiting device |
| CN201260077Y (en) * | 2008-09-03 | 2009-06-17 | 魏福道 | Arc extinguishing device grounded through high frequency damp element |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103545796A (en) * | 2013-09-16 | 2014-01-29 | 国家电网公司 | Single-phase grounding fault handling device and method for power distribution network with non-effectively grounded neutral points |
| CN103474982A (en) * | 2013-09-29 | 2013-12-25 | 安徽一天电气技术有限公司 | Arc extinction device for eliminating interphase short circuit in single-resistance method |
| CN104935142A (en) * | 2015-05-31 | 2015-09-23 | 郭富强 | DC motor and application thereof |
| CN107332226A (en) * | 2017-08-29 | 2017-11-07 | 安徽三和电力技术有限公司 | Overvoltage suppressing system based on intelligent switch |
| CN107332226B (en) * | 2017-08-29 | 2019-10-29 | 安徽三和电力技术有限公司 | Overvoltage suppressing system based on intelligent switch |
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Application publication date: 20111221 |