CN205595770U - A harmonic elimination device of cooperation on -off arc extinction - Google Patents
A harmonic elimination device of cooperation on -off arc extinction Download PDFInfo
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- CN205595770U CN205595770U CN201620237083.0U CN201620237083U CN205595770U CN 205595770 U CN205595770 U CN 205595770U CN 201620237083 U CN201620237083 U CN 201620237083U CN 205595770 U CN205595770 U CN 205595770U
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- 230000008030 elimination Effects 0.000 title claims abstract description 20
- 238000003379 elimination reaction Methods 0.000 title claims abstract description 20
- 230000008033 biological extinction Effects 0.000 title abstract 6
- 230000007935 neutral effect Effects 0.000 claims abstract description 17
- 230000004044 response Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 2
- 230000005350 ferromagnetic resonance Effects 0.000 description 12
- 238000000034 method Methods 0.000 description 6
- 230000001629 suppression Effects 0.000 description 5
- 230000009471 action Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The utility model provides a harmonic elimination device of cooperation on -off arc extinction, includes arc extinction device switch drive module, time delay module (4), high -voltage switch (3), voltage transformer (1), one time harmonic elimination ware (2) and earthing switch (6), harmonic elimination ware and high -voltage switch parallel connection install jointly between voltage transformer high -pressure side neutral point and ground wire, high -voltage switch links to each other through the switch drive module of time delay module with on -off arc extinction system (5), switch drive module links to each other with earthing switch simultaneously. The utility model discloses can guarantee the normal trouble route selection of arc extinction device and restrain ferroresonance that single -phase ground connection arouses and shove. Accept the drive instruction of arc extinction device system simultaneously with the parallelly connected high -voltage switch of harmonic elimination ware, it is simple reliable, there is not any negative effect to the system, can suppress effectively that cause ferroresonance after ground connection disappears and the PT high -pressure side shoves, saved the huge cost of changing the 4PT mode of connection, economy is convenient.
Description
Technical field
This utility model relates to a kind of harmonic elimination apparatus coordinating switching regulator extinguishing arc, belongs to distribution voltage transformer resist technology field.
Background technology
In power system, singlephase earth fault accounts for institute out of order 60%, and mostly is the earth fault of instantaneity.When line capacitance electric current is bigger, trouble point forms arc reignition and the intermittent phenomena of extinguishing, causes inductance in electrical network, capacitor loop generation electromagnetic oscillation, causes arc overvoltage；The most traditional arc suppression coil has obtained using widely in distribution, and its inductive current compensate for the capacitance current of electrical network, makes earth fault residual flow reduce, beneficially the extinguishing of ground arc.Increasing however as transformer station 10 kV outgoing line, system capacitive current is increasing, and existing arc suppression coil capacity tends not to meet demand, need to change arc suppression coil and ground connection becomes, of a high price.
For this, switching regulator arc-extinction device gradually starts to promote the use of in recent years, this device is with parallel shunt as principle: when system generation singlephase earth fault, the route selection module of this device carries out failure line selection, judge that rapidly fault is separate, and close a floodgate at 50ms internal fault phase split-phase switch, artificial ground, Earth Phase is allowed to force isoelectric level with the earth, earth current at transfer earth fault, making the electric current at earth fault go to zero, electric arc can not maintain and extinguish, thus replaces arc suppression coil to reach the purpose of extinguishing arc.
But can not ignore be, there is the process that a single-phase earthing eliminates in running of this device, easily cause ferromagnetic resonance, bigger shoving can be produced when power system capacity is bigger, voltage transformer (PT) primary side current is caused to increase, cause PT high-pressure side fuse blows, time serious, even burn PT, threaten power system security production run.
The method of common elimination distribution ferromagnetic resonance is broadly divided into harmonic elimination, secondary harmonic elimination, a 4PT connection.The principle of harmonic elimination is at PT primary side neutral point and a nonlinear resistance (varistor, critesistor etc.) of connecting before ground, it is therefore an objective to increases zero-sequence reactance, thus damps zero-sequence current.The method principle is simple, low cost, take up room little, has obtained using widely, but can affect the certainty of measurement of PT.During singlephase earth fault, the existence of resonance eliminator makes the residual voltage of PT open-delta reduce, and affects the failure line selection of earth protective device；The secondary side open-delta of short circuit PT when the principle of secondary harmonic elimination is that ferromagnetic resonance occurs, consume resonant energy, but the method poor reliability, often it is difficult to identification ferromagnetic resonance and singlephase earth fault, in particular by residual voltage as often producing erroneous judgement during criterion, and the PT primary side that single-phase earthing disappearance cannot be suppressed to cause shoves；The principle of 4PT method is zero sequence PT of connecting between the neutral point and ground of PT, occur singlephase earth fault time main PT still in positive sequence symmetrical voltage under, transformer inductance does not change, resonance will not occur, therefore it is the measure well suppressing ferromagnetic resonance, but carrying out often transforming because the deficiency in switch cubicle space need to all be transformed in some do not take the system of 4PT method, cost is bigger.
Therefore a resonance eliminator is still widely used in distribution, and the residual voltage that the most most of arc-extinction device uses PT open delta carries out failure line selection phase selection, some transformer stations can break down when coordinating run in view of both, the most do not fill a resonance eliminator, do not take any measure, cause PT insurance frequently to burn.
Summary of the invention
The purpose of this utility model is, in order to overcome a resonance eliminator to be difficult to coordinate the difficult problem run with the arc-extinction device using residual voltage to carry out failure line selection, this utility model provides the harmonic elimination apparatus coordinating switching regulator extinguishing arc, can guarantee that normal failure line selection and the ferromagnetic resonance suppressing single-phase earthing to cause of arc-extinction device and shoves.
The technical solution of the utility model is, a kind of harmonic elimination apparatus coordinating switching regulator extinguishing arc, including arc-extinction device switch drive module, time delay module, high-voltage switch gear, voltage transformer, a resonance eliminator and earthed switch.
A described resonance eliminator is connected in parallel with high-voltage switch gear, is commonly mounted between voltage transformer (PT) high-pressure side neutral point and ground wire；Described high-voltage switch gear is connected through the switch drive module of time delay module with switching regulator arc-extinguishing system；Described switch drive module is connected with earthed switch simultaneously.
When driving module at arc-extinction device sends the most separate ground connection vacuum switch reclosing command, high-voltage switch gear separating brake simultaneously, eliminate rapidly issuable ferromagnetic resonance and shove, after of short duration time delay, high-voltage switch gear closes a floodgate again, thus ensure that PT does not affect secondary side open-delta residual voltage, it is ensured that the normal operation of fault line selection device.
Described high-voltage switch gear is the normally closed vacuum switch of 10kV, it is necessary to be resistant to the voltage strength that phase voltage specified with PT is equal.Described high-voltage switch gear is in "on" position under distribution nominal situation, in parallel with a resonance eliminator, PT high-pressure side neutral point is equivalent to directly be connected to the ground, and current potential is zero, the real residual voltage of open-delta voltage response system, it is ensured that the failure line selection function of arc-extinction device.
Described arc-extinction device switch drive module is arranged in switching regulator arc-extinguishing system, arc-extinction device switch drive module signal takes from arc-extinguishing system itself, when arc-extinguishing system detects single-phase earthing, it drives module quickly to send the most separate vacuum switch combined floodgate driving instruction, this instruction is simultaneously transferred to the relay of high-voltage switch gear, normally closed high-voltage switch gear separating brake simultaneously, one time resonance eliminator accesses, and is beneficial to eliminate ferromagnetic resonance and shove.
A described resonance eliminator is LXQ-III type resonance eliminator, if PT neutral point is semi-insulating, one time resonance eliminator should prevent from jeopardizing insulation with parallel discharge pipe to limit neutral point voltage.
Described time delay module realizes the function of normally closed power cut off delay closing relay, is made up of two relays, it is ensured that return to normal in time after high-voltage switch gear action.
The beneficial effects of the utility model: this utility model can guarantee that normal failure line selection and the ferromagnetic resonance suppressing single-phase earthing to cause of arc-extinction device and shoves.The high-voltage switch gear in parallel with resonance eliminator accepts the driving instruction of arc-extinction device system simultaneously, simple and reliable, to system without any negative effect, ground connection can be effectively suppressed after disappearing, to cause ferromagnetic resonance and PT high-pressure side to shove, eliminate the significant cost changing the 4PT mode of connection, economical convenient.
Accompanying drawing explanation
Fig. 1 is system catenation principle figure of the present utility model；
Fig. 2 is that driving instruction controls high voltage switch circuit schematic diagram；
In figure, 1 is voltage transformer；2 is resonance eliminator；3 is high-voltage switch gear；4 is time delay module；5 is switching regulator arc-extinguishing system；6 is earthed switch；7 is 10kV bus；8 is time-delay relay；9 is high-voltage switch gear relay.
Detailed description of the invention
Detailed description of the invention of the present utility model is as depicted in figs. 1 and 2.
A kind of harmonic elimination apparatus coordinating switching regulator extinguishing arc of the present embodiment includes arc-extinction device switch drive module, time delay module 4, high-voltage switch gear 3,1, resonance eliminator 2 of voltage transformer and earthed switch 6.
Described arc-extinction device switch drive module is connected with time delay module with earthed switch simultaneously, when singlephase earth fault being detected, switch drive module sends pulse reclosing command to the earthed switch of bus, sends driving separating brake instruction through the high-voltage switch gear that time delay module pair is in parallel with resonance eliminator simultaneously.
Described high-voltage switch gear is the normally closed vacuum switch of 10kV, it is necessary to be resistant to the voltage strength that phase voltage specified with PT is equal.High-voltage switch gear and a resonance eliminator parallel connection, it is arranged between PT high-pressure side neutral point and ground, be equivalent to neutral ground, open-delta two ends equal response system real residual voltage when nominal situation and single-phase earthing, it is ensured that arc-extinction device failure line selection function at ordinary times.
A described resonance eliminator is common LXQ-III type resonance eliminator, if PT neutral point is semi-insulating, one time resonance eliminator should prevent from jeopardizing insulation with parallel discharge pipe to limit neutral point voltage.
Described time delay module realizes the function of normally closed power cut off delay closing relay, and circuit diagram, with reference to Fig. 2, is made up of with relay K T2 relay K T1.After relay K T1 accepts the pulsed drive level that arc-extinction device switch drive module sends, its normally opened contact closes, and makes relay K T2 be energized, and corresponding normally opened contact closes, and controls high-voltage switch gear and turns off action, is accessed between PT neutral point and ground by a resonance eliminator；After of short duration time delay, (time can set as required, but need to ensure there is the enough harmonic elimination time) contact of relay K T1 returns to normally open, make relay K T2 no power, contact returns to normally off, control high-voltage switch gear to close a floodgate, one time resonance eliminator is shorted, and PT neutral point reverts to be directly grounded.
Advantage of this embodiment is that: coordinate arc-extinction device to realize bulky capacitor electric current distribution network systems and eliminate arc overvoltage, suppression ferromagnetic resonance and the function shoved, ensure that during system worked well, PT open delta voltage is substantially zeroed, when singlephase earth fault occurs, open delta voltage reflects actual residual voltage size, arc-extinction device accurate failure judgement circuit and separate, split-phase vacuum switch and the high-voltage switch gear being connected in parallel on resonance eliminator two ends are sent action command simultaneously, eliminate the intermittent electric arc of trouble point in time, it also avoid ground connection to disappear the ferromagnetic resonance that causes and shoving.After one section of time delay, high-voltage switch gear returns to normal condition.For permanent earth fault, arc-extinction device after sending instruction several times will locking, point out permanent earth, therefore high-voltage switch gear also will not frequent movement.
Claims (4)
1. the harmonic elimination apparatus coordinating switching regulator extinguishing arc, it is characterised in that described device includes arc-extinction device switch drive module, time delay module, high-voltage switch gear, voltage transformer, a resonance eliminator and earthed switch；A described resonance eliminator is connected in parallel with high-voltage switch gear, is commonly mounted between voltage transformer high-pressure side neutral point and ground wire；Described high-voltage switch gear is connected through the switch drive module of time delay module with switching regulator arc-extinguishing system；Described switch drive module is connected with earthed switch simultaneously.
A kind of harmonic elimination apparatus coordinating switching regulator extinguishing arc, it is characterized in that, described high-voltage switch gear is the normally closed vacuum switch of 10kV, described high-voltage switch gear is in "on" position under distribution nominal situation, in parallel with a resonance eliminator, PT high-pressure side neutral point is equivalent to directly be connected to the ground, and current potential is zero, the real residual voltage of open-delta voltage response system, it is ensured that the failure line selection function of arc-extinction device.
A kind of harmonic elimination apparatus coordinating switching regulator extinguishing arc, it is characterised in that a described resonance eliminator is LXQ-III type resonance eliminator, if PT neutral point is semi-insulating, one time resonance eliminator should be with parallel discharge pipe to limit neutral point voltage.
A kind of harmonic elimination apparatus coordinating switching regulator extinguishing arc, it is characterised in that described time delay module realizes the function of normally closed power cut off delay closing relay, is made up of two relays.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620237083.0U CN205595770U (en) | 2016-03-28 | 2016-03-28 | A harmonic elimination device of cooperation on -off arc extinction |
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| CN201620237083.0U CN205595770U (en) | 2016-03-28 | 2016-03-28 | A harmonic elimination device of cooperation on -off arc extinction |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877305A (en) * | 2017-03-07 | 2017-06-20 | 河北旭辉电气股份有限公司 | New arc suppression coil earthing compensation device with grounding shunt function |
| CN107769175A (en) * | 2017-11-29 | 2018-03-06 | 西安华桑科技发展有限公司 | The determination methods and device of overvoltage in a kind of power network |
| CN110323731A (en) * | 2019-07-03 | 2019-10-11 | 张安斌 | Voltage transformer primary side neutral point controllable impedance harmonic elimination apparatus |
| CN110571778A (en) * | 2019-10-18 | 2019-12-13 | 云南电网有限责任公司电力科学研究院 | Earth fault current compensation system and method for self-generating power phase power supply |
| CN112509846A (en) * | 2020-10-20 | 2021-03-16 | 国网江苏省电力有限公司盐城供电分公司 | Electric grounding control device of switch cabinet harmonic eliminator |
-
2016
- 2016-03-28 CN CN201620237083.0U patent/CN205595770U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106877305A (en) * | 2017-03-07 | 2017-06-20 | 河北旭辉电气股份有限公司 | New arc suppression coil earthing compensation device with grounding shunt function |
| CN107769175A (en) * | 2017-11-29 | 2018-03-06 | 西安华桑科技发展有限公司 | The determination methods and device of overvoltage in a kind of power network |
| CN107769175B (en) * | 2017-11-29 | 2024-03-29 | 西安华桑科技发展有限公司 | Method and device for judging overvoltage in power grid |
| CN110323731A (en) * | 2019-07-03 | 2019-10-11 | 张安斌 | Voltage transformer primary side neutral point controllable impedance harmonic elimination apparatus |
| CN110323731B (en) * | 2019-07-03 | 2021-05-11 | 张安斌 | Voltage transformer primary side neutral point controllable impedance resonance elimination device |
| CN110571778A (en) * | 2019-10-18 | 2019-12-13 | 云南电网有限责任公司电力科学研究院 | Earth fault current compensation system and method for self-generating power phase power supply |
| CN112509846A (en) * | 2020-10-20 | 2021-03-16 | 国网江苏省电力有限公司盐城供电分公司 | Electric grounding control device of switch cabinet harmonic eliminator |
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