CN105610127A - Water flow protective gap and lightning arrester parallel connection protection system for 110kV transformer neutral point - Google Patents
Water flow protective gap and lightning arrester parallel connection protection system for 110kV transformer neutral point Download PDFInfo
- Publication number
- CN105610127A CN105610127A CN201610000343.7A CN201610000343A CN105610127A CN 105610127 A CN105610127 A CN 105610127A CN 201610000343 A CN201610000343 A CN 201610000343A CN 105610127 A CN105610127 A CN 105610127A
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- Prior art keywords
- gap
- current
- protection
- arrester
- neutral point
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/04—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/06—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage using spark-gap arresters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
Abstract
The invention discloses a water flow protective gap and lightning arrester parallel connection protection system for a 110kV transformer neutral point. The system comprises a hollow low-voltage electrode (1), a solid high-voltage electrode (2), a lightning arrester (4), a micro-current detection conditioning element (5), an electromagnetic valve (8), a voltage relay (6) and a 220V alternating current power supply (10). The system realizes overvoltage protection through the water flow protective gap and lightning arrester parallel connection control; when the system suffers from a single-phase grounding short circuit and is not grounded, or when the system is in an open-phase operation, the water flow protective gap only acts under power frequency steady state voltage; under lightning overvoltage, the lightning arrester releases lightning current, and the water flow protective gap is not formed; under other fault conditions, the water flow protective gap is not formed; and the lightning arrester acts under a relatively high transient overvoltage so as to limit the transient overvoltage to prevent gap maloperation. According to the water flow protective gap and lightning arrester parallel connection protection system, the difficulty of matching between the lightning arrester and the gap, and the shortcomings of refusal-operation of the protective gap under harmful power frequency overvoltage, and maloperation of the protective gap under the relatively high transient overvoltage in the conventional protection way are avoided.
Description
Technical field
The present invention relates to a kind of 110kV transformer neutral point current protection gap protection system in parallel with arrester, belong to electricityPower system overvoltage resist technology field.
Background technology
In 110kV system, in order to limit single-line to ground fault electric current, prevent communication interference and meet relay protection wholeFixed needs, take the operation of some transformers isolated neutral conventionally. Forefathers' theoretical research and field operation experiences for many yearsShow: in the time of 110kV system generation lightning surge, single-line to ground fault and open-phase operation, during 110kV transformer is earth-freeProperty point may produce more serious overvoltage. Add current 110kV transformer neutral point and adopt graded insulation more, insulation waterFlat relatively weak, so be necessary for the research of 110kV transformer neutral point overvoltage protection.
Generally adopt at present the protection in parallel of the protection of single the air gap, single protection of arrester, the air gap and arresterThese 3 kinds of traditional protection modes are protected the insulation of 110kV transformer neutral point. The shortcoming of single the air gap protected mode mainly existsIn the air gap easily because of dispersiveness is large and clearance distance compared with difficult control malfunction or tripping. Lacking of single protection of arrester modePoint is mainly that arrester is easily damaged or explodes because through-current capacity is limited under compared with high power-frequency overvoltage. The air gap andArrester traditional protection mode in parallel is at present the most general, but also has a lot of deficiencies, mainly contains following shortcoming:
(1) discharge dispersity of the air gap is large, and particularly the dispersiveness of impulse sparkover voltage is very large, and gap protection is easy toMalfunction or tripping. When building in transformer station, the bar electrode of the air gap is conventionally by manually welding, and the error of clearance distanceGreatly, and concentricity is poor, and gap is after arcing, and electrode may ablation, causes the variation of clearance distance, theseCapital affects gap discharge voltage largely. The meteorological conditions such as temperature, humidity, air pressure also can affect the electric discharge of the air gapVoltage. More existing the air gap adopts goat's horn type and is fixed on composite insulator, and its outstanding advantages is arc ablation resistancePerformance has larger improvement, but with regard to himself discharge voltage and dispersiveness, its characteristic and excellent difference gap are few.
(2) under lightning surge or other higher transient overvoltages, the transient state electricity of the air gap through being everlasting higherDepress breakdownly, cause the malfunction of relay protection. If increase air gap distance, although can reduce the air gap in transient stateThe probability of malfunction under voltage, but may cause gap to be refused in the time of system single phase ground fault and lost territory or open-phase operationMoving, cannot protect neutral point insulation and arrester.
(3) joining between the flash-over characteristic of the electric property of arrester, the air gap and neutral point graded insulation levelClose more difficult.
Therefore,, for overcoming the shortcoming of traditional protection mode, need to study a kind of novel protected mode and protect in transformerProperty point insulating and arrester.
Summary of the invention
The object of the invention is, for the protection of single the air gap, single protection of arrester, the air gap and arrester alsoUNPROFOR is protected the deficiency of these 3 kinds of traditional protection modes, and the present invention proposes a kind of 110kV transformer neutral point current protection gap and keeps awayThunder device protection system in parallel.
Realizing technical scheme of the present invention is, a kind of 110kV transformer neutral point current protection gap is in parallel with arresterProtection system protects gap and arrester parallel connection to realize overvoltage protection by current; When system single phase ground fault andWhen lost territory or open-phase operation, only move under power frequency steady state voltage in current protection gap; Under lightning surge, arrester is movingThe lightning current of releasing, current protection gap can not form, and more can not move; Under other failure conditions, current protection gap is notCan form, gap can not be moved, and arrester moves under higher transient overvoltage, prevents gap mistake to limit transient overvoltageMoving; Described current protection clearance distance is 170 ~ 210mm.
A kind of 110kV transformer neutral point current protection gap protection system in parallel with arrester comprises hollow low tensionThe utmost point, solid high-field electrode, arrester, micro-current detecting conditioning element, magnetic valve, voltage relay and 220 volts of AC powers. EmptyHeart low-field electrode and solid high-field electrode are cylindrical, are positioned on same axis, the one section of guarantor of being separated by between the head of two electrodesProtect gap; The common connection transformer neutral point in the afterbody of solid high-field electrode and arrester one end; The afterbody of hollow low-field electrodeConnect plastic water pipe, water pipe connected electromagnetic valve, magnetic valve connects water tap; Magnetic valve and the series connection of 220V AC power compositionLoop, the break-make of this series loop is by voltage relay control; The arrester other end is by micro-current detecting conditioning element ground connection;Micro-current detecting conditioning element connects voltage relay; Voltage relay is controlled and is entered hollow low tension by control magnetic valveThe water yield of the utmost point.
When system generation lightning surge of the present invention, current can not spray, and are still air dielectric between 2 electrodes,The lightning impulse discharge voltage of 170mm the air gap is 180kV; Due to the pressure limiting effect of arrester, neutral point transient overvoltageAmplitude can not be greater than 140kV, therefore the air gap can not puncture under transient overvoltage, has effectively overcome in the middle of traditional protection modeThe shortcoming that gap punctures under the transient voltage of being everlasting.
When system generation open-phase operation fault of the present invention or single-line to ground fault and lost territory, arrester exchanges total currentExceed 3mA, current can spray immediately and form current protection gap, and current protection gap is breakdown immediately, protection transformer neutralityPoint insulating and arrester; Effectively overcome the air gap tripping under harmful too high power-frequency overvoltage of being everlasting in traditional protection modeShortcoming; Again because described current clearance distance is longer (between the current protection of protected mode of the present invention than the clearance distance of traditional approachStand-off distance is from being 170 ~ 210mm), so than traditional protection mode, the electric arc of this novel protected mode more easily extinguishes.
The present invention protects gap can under residual voltage of arrester, not move under any transient voltage.
Operation principle of the present invention is, in the time of system single phase ground fault and lost territory or open-phase operation fault,Arrester electric current is through micro-current detecting conditioning element, thus the driving voltage actuating of relay, and at this moment magnetic valve action makes currentFrom low-field electrode ejection, current protection gap forms and breakdown (being current protection gap action) immediately, thereby protection becomesDepressor neutral point insulation and arrester; Under lightning surge, by the lightning arrestor movement lightning current of releasing, current can not spray, noCan form current protection gap, gap can not be moved; Under other failure conditions, current can not spray, gap can not move (asFruit transient voltage is higher, and lightning arrestor movement is with restriction transient overvoltage).
Beneficial effect of the present invention is, the current protection gap that protection system of the present invention adopts is 170 ~ 210mm, actionTime < 1s, system works is reliable, can overcome well the deficiency of traditional protection mode. Current protection gap and arrester are alsoIn UNPROFOR protecting system, the cooperation in arrester and gap is easy to realize, and has effectively overcome arrester and gap in traditional protection mode and has joinedClose difficult shortcoming.
The present invention protects gap and arrester parallel connection to realize overvoltage protection by current, the electric discharge in current protection gapVoltage is starkly lower than with equidistant the air gap discharge voltage, and dispersiveness is also lower than the air gap. When system occurs single-phaseWhen earth fault and lost territory or open-phase operation, arrester electric current will reach 3mA or higher, and current can spray formation water immediatelyStream protection gap, current protection gap is breakdown immediately, and the insulation of protection transformer neutral point and arrester, effectively overcome traditionThe shortcoming of the air gap tripping under harmful too high power-frequency overvoltage of being everlasting in protected mode. Again because this novel protected modeClearance distance is longer than the clearance distance of traditional approach, so than traditional protection mode, the electric arc of this novel protected mode moreEasily extinguish. Under lightning surge, the amplitude of lightning current that flows through arrester is not more than 1.5kA, micro-current detecting conditioning elementCan sustain lightning current completely, therefore system of the present invention is reliable and secure.
In the time of 110kV system generation single-phase earthing and lost territory, transformer neutral point power frequency steady-state overvoltage will reach 63.5 ~73kV, protection system action of the present invention, current protection gap forms. Because the dispersiveness in current protection gap is very low, Gu ShuiStream protection gap will be as long as a formation will puncture immediately. In the time there is open-phase operation, neutral point power frequency steady-state overvoltage reaches63.5 ~ 73kV or higher, the workflow of this new control system is the same when there is single-phase earthing and lost territory. This effectively overcomesThe shortcoming of the air gap tripping under harmful too high power-frequency overvoltage of being everlasting in traditional protection mode.
The present invention is not only applicable to 110kV transformer, is equally applicable to 220kV transformer yet. Only need in this transformerProperty point current protection gap is adjusted a little with the partial parameters of arrester new control system in parallel.
Brief description of the drawings
Fig. 1 is 110kV transformer current protection gap new control system structural representation in parallel with arrester;
In figure, the 1st, hollow low-field electrode; The 2nd, solid high-field electrode; The 3rd, transformer neutral point; The 4th, arrester; The 5th, micro-electric currentDetect conditioning element; The 6th, voltage relay; The 7th, water tap; The 8th, magnetic valve; The 9th, plastic water pipe; 10 is 220 volts of interchangesPower supply.
Detailed description of the invention
Below by embodiment, the present invention is described in further detail.
The composition structure of the present embodiment as shown in Figure 1, protect gap and keep away by the present embodiment 110kV transformer neutral point currentThunder device protection system in parallel comprise hollow low-field electrode 1, solid high-field electrode 2, arrester 4, micro-current detecting conditioning element 5,Magnetic valve 8,6 and 220 volts of AC powers 10 of voltage relay. Hollow low-field electrode 1 is steel hollow electrode, the hollow hole of headDiameter is 4mm, and external diameter is 16mm, and water column is from this low-field electrode head aperture ejection. High-field electrode is steel solid electrode, diameterFor 16mm, the length of 2 electrodes is all 300mm; High pressure solid electrode is supported by support insulator, the afterbody of low pressure coreless armatureConnect plastic water pipe 9, water pipe connected electromagnetic valve 8, magnetic valve 8 connects water tap 7, magnetic valve 8 and 220V AC power 10Composition series loop, the break-make of this series loop is controlled by voltage relay 6. Micro-current detecting conditioning element 5 is responded to arrester 4Thereby electric current is controlled the action of voltage relay 6. By verification experimental verification, the breakdown voltage and the dispersiveness that obtain running water water column are equalBe starkly lower than the breakdown voltage of the air gap, so clearance distance can be grown as far as possible, put according to current protection gap power frequencyThe operation principle of electric test data and new control system, setting clearance distance is 170 ~ 210mm, and 110kV transformer neutralityPoint the air gap conventional lengths is only 110 ~ 140mm.
In the present embodiment, arrester model specification is Y1.5W-55/140, and support insulator model specification is FZS6-126/8. Voltage relay model specification is HJR1-2CL-05V, and electromagnetic valve model specification is 2W-160-15.
Micro-current detecting conditioning element is contactless access, can tolerate lightning current, can effectively suppress space and disturb, inspectionSurvey precision is high, good stability.
Because the diameter of hollow low-field electrode head aperture is 4mm, the diameter of water column is about 4mm. Survey by testAmount, the running water resistivity that obtains Wuhan University's electrical engineering institute high-voltage test hall is 35 Ω m; Through calculating, straightThe resistance of the water column from the beginning of footpath 4mm, length 170mm is 4.736 × 105Ω, its resistance is very large, therefore only have this water column to be hitWear, could protect neutral point insulation and arrester.
In the time that system does not break down, the gap between these 2 electrodes of hollow low-field electrode and solid high-field electrode is emptyGas gap. In the time of system single phase ground fault and lost territory, transformer neutral point power frequency steady-state overvoltage is 63.5 ~ 73kV.In the time that overvoltage is 63.5kV, the interchange total current that flows through this arrester is about 3mA, and the output of micro-current detecting conditioning element is about3V, voltage relay action, its moving together contact closure, then 220V AC power and magnetic valve form closed-loop path, magnetic valveAction, current are just from hollow low-field electrode ejection, total actuation time≤1s of whole system. Arrester is through manufacturer's inspectionSurvey, can under 63.5kV power-frequency overvoltage, tolerate at least 10min, under 73kV power frequency steady-state overvoltage, tolerate at least 2min andCan not blast. At this moment current protection gap forms, and then whole water column is punctured by power frequency steady state voltage 63.5 ~ 73kV(being current protection gap action), transformer neutral point current potential almost reduces to 0, and arrester electric current reduces rapidly to approach 0, micro-electricityStream detects conditioning element and there is no output, and voltage relay and magnetic valve reset, and current are no longer ejection just. At this moment because electricityArc is smooth combustion, and electric arc transfers air arc to from current electric arc. After neutral point overvoltage disappears, arc extinction.
By power-frequency discharge test is carried out in current protection gap, can find the discharge voltage in current protection gap and putElectrodispersion is all starkly lower than the air gap. And in process of the test, when Power frequency voltage rising is when approaching discharge voltage soon,High-field electrode head can be observed and strong stable electric spark can be produced; In the time that Power frequency voltage rising arrives discharge voltage, wholeWater column is just punctured completely, and with the sound of " whip ".
In the time there is open-phase operation, transformer neutral point power frequency steady-state overvoltage possibility >=63.5kV, its current protectionClearance control system motion flow is the same during with single phase ground fault and lost territory.
Under lightning surge, because be tens ms the actuation time of voltage relay and magnetic valve, and lightning waveAction time, the time was very short in μ s, so voltage relay and magnetic valve have little time action at all, lightning wave is just via keeping awayThunder device has been released, and current just can not spray, and can not form current protection gap, between 2 electrodes, remains air dielectric, because ofFor clearance distance, than long many of conventional air clearance distance, (clearance distance of new control system is at 170 ~ 210mm, thunder and lightning punchingHit discharge voltage > 180kV), and since the pressure limiting effect of Y1.5W-55/140 arrester, neutral point lightning surge amplitudeCan > 140kV, therefore gap can not moved under Lightning Transient voltage. According to amount of literature data and the warp of scene operation for many yearsTest, the amplitude of lightning current that flows through arrester can > 1.5kA, and micro-current detecting conditioning element can be born completely.
Under other failure conditions (as effectively earthed system generation singlephase earth fault), neutral point power frequency steady-state overvoltage≤ 43.8kV, the electric current very little (< 0.44mA) that flows through arrester, the output of micro-current detecting conditioning element is very little, and voltage continuesElectrical equipment and magnetic valve can not move, and current can not spray, and can not form current protection gap, remain empty between 2 electrodesGas medium, gap can not be moved, if transient voltage is higher, lightning arrestor movement prevents gap malfunction with restriction transient overvoltage.
In sum, in the time of system single phase ground fault and lost territory or open-phase operation, current protection gap only existsUnder power frequency steady state voltage, move. Under lightning surge, the lightning arrestor movement lightning current of releasing, current protection gap can not form,More can not move. Under other failure conditions, current protection gap can not form, and gap can not be moved, and arrester is higher temporaryUnder state overvoltage, move.
Claims (6)
1. a 110kV transformer neutral point current protection gap protection system in parallel with arrester, is characterized in that described systemAll control of crossing current protection gap and arrester parallel connection realizes overvoltage protection; When system single phase ground fault andWhen lost territory or open-phase operation, only move under power frequency steady state voltage in current protection gap; Under lightning surge, arrester is movingThe lightning current of releasing, current protection gap can not form, and more can not move; Under other failure conditions, current protection gap is notCan form, gap can not be moved, and arrester moves under higher transient overvoltage, prevents gap mistake to limit transient overvoltageMoving; Described current protection clearance distance is 170 ~ 210mm.
2. a kind of 110kV transformer neutral point current are protected gap protection system in parallel with arrester according to claim 1,It is characterized in that, described system comprises hollow low-field electrode, solid high-field electrode, arrester, micro-current detecting conditioning element, electricityMagnet valve, voltage relay and 220 volts of AC powers; Described hollow low-field electrode and solid high-field electrode are cylindrical, are positioned atOn same axis, a segment protect gap is separated by between the head of two electrodes; The afterbody of solid high-field electrode and arrester one end are altogetherWith connection transformer neutral point; The afterbody of hollow low-field electrode connects plastic water pipe, water pipe connected electromagnetic valve, and magnetic valve connects certainlyCarry out tap; Magnetic valve and the series loop of 220V AC power composition, the break-make of this series loop is by voltage relay control; Keep awayThe thunder device other end is by micro-current detecting conditioning element ground connection; Micro-current detecting conditioning element connects voltage relay; Voltage continuesElectrical equipment controls by controlling magnetic valve the water yield that enters hollow low-field electrode.
3. a kind of 110kV transformer neutral point current are protected gap protection system in parallel with arrester according to claim 1,It is characterized in that, when described system generation lightning surge, current can not spray, and are still air dielectric between 2 electrodes,The lightning impulse discharge voltage of 170mm the air gap is 180kV; Due to the pressure limiting effect of arrester, neutral point transient overvoltageAmplitude can not be greater than 140kV, therefore the air gap can not puncture under transient overvoltage, has effectively overcome in the middle of traditional protection modeThe shortcoming that gap punctures under the transient voltage of being everlasting.
4. a kind of 110kV transformer neutral point current are protected gap protection system in parallel with arrester according to claim 1,It is characterized in that, when described system generation open-phase operation fault or single-line to ground fault and lost territory, flow through the friendship of arresterStream total current exceedes 3mA, and current can spray immediately and form current protection gap, and current protection gap is breakdown immediately, and protection becomesDepressor neutral point insulation and arrester; Effectively overcome in traditional protection mode the air gap excessively electric through harmful too high power frequency of being everlastingDepress the shortcoming of tripping; Again because described current protection clearance distance is longer than the air gap distance of traditional approach, so thanTraditional protection mode, the electric arc of this novel protected mode more easily extinguishes.
5. a kind of 110kV transformer neutral point current are protected gap protection system in parallel with arrester according to claim 1,It is characterized in that, described current protection gap can not moved under any transient voltage under residual voltage of arrester.
6. a kind of 110kV transformer neutral point current are protected gap protection system in parallel with arrester according to claim 2,It is characterized in that, described hollow low-field electrode is steel hollow electrode, and the hollow hole diameter of head is 4mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610000343.7A CN105610127A (en) | 2016-01-04 | 2016-01-04 | Water flow protective gap and lightning arrester parallel connection protection system for 110kV transformer neutral point |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610000343.7A CN105610127A (en) | 2016-01-04 | 2016-01-04 | Water flow protective gap and lightning arrester parallel connection protection system for 110kV transformer neutral point |
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| CN105610127A true CN105610127A (en) | 2016-05-25 |
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| CN201610000343.7A Pending CN105610127A (en) | 2016-01-04 | 2016-01-04 | Water flow protective gap and lightning arrester parallel connection protection system for 110kV transformer neutral point |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107276061A (en) * | 2017-06-22 | 2017-10-20 | 天津择东能源科技股份有限公司 | A kind of 110kV transformer neutral points protection device and method |
| CN110445082A (en) * | 2019-08-20 | 2019-11-12 | 长沙理工大学 | The single-phase mounting structure and its test method of the parallel connection gaps of 10kV distribution line |
| CN112485573A (en) * | 2020-11-30 | 2021-03-12 | 国网四川省电力公司电力科学研究院 | System and method for detecting state of control gap under power frequency transient overvoltage |
| EP3747100B1 (en) * | 2018-01-30 | 2022-03-16 | Hitachi Energy Switzerland AG | Surge arrestor dimensioning in a dc power transmission system |
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| CN202197100U (en) * | 2011-07-31 | 2012-04-18 | 浙江中能电气有限公司 | Transformer neutral point grounding protection device |
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| CN103414157A (en) * | 2013-08-22 | 2013-11-27 | 深圳供电局有限公司 | Device for operation of protective gap of transformer neutral point |
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2016
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| US20120153976A1 (en) * | 2010-12-16 | 2012-06-21 | Abb Research Ltd | Device with overvoltage protection and method for its testing |
| CN202197100U (en) * | 2011-07-31 | 2012-04-18 | 浙江中能电气有限公司 | Transformer neutral point grounding protection device |
| CN103414157A (en) * | 2013-08-22 | 2013-11-27 | 深圳供电局有限公司 | Device for operation of protective gap of transformer neutral point |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107276061A (en) * | 2017-06-22 | 2017-10-20 | 天津择东能源科技股份有限公司 | A kind of 110kV transformer neutral points protection device and method |
| EP3747100B1 (en) * | 2018-01-30 | 2022-03-16 | Hitachi Energy Switzerland AG | Surge arrestor dimensioning in a dc power transmission system |
| CN110445082A (en) * | 2019-08-20 | 2019-11-12 | 长沙理工大学 | The single-phase mounting structure and its test method of the parallel connection gaps of 10kV distribution line |
| CN112485573A (en) * | 2020-11-30 | 2021-03-12 | 国网四川省电力公司电力科学研究院 | System and method for detecting state of control gap under power frequency transient overvoltage |
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