CN105004970A - Switching device of high-voltage partial discharge models under high air pressure - Google Patents
Switching device of high-voltage partial discharge models under high air pressure Download PDFInfo
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- CN105004970A CN105004970A CN201510111798.1A CN201510111798A CN105004970A CN 105004970 A CN105004970 A CN 105004970A CN 201510111798 A CN201510111798 A CN 201510111798A CN 105004970 A CN105004970 A CN 105004970A
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Abstract
The invention provides a switching device for high-voltage partial discharge models under the high air pressure. The switching device is used for a partial discharge test for a cavity of a gas insulated metal-enclosed switchgear (GIS). The switching device is composed of the partial discharge models, telescopic push rods, a high air-pressure sealed cavity, a cavity high-voltage electrode, and a controller. Each telescopic push rod is controlled by the controller to be pushed out or retracted, so that one partial discharge model is pushed out to contact with the cavity high-voltage electrode, or one partial discharge model is retracted to be away from the cavity high-voltage electrode. The lengths of the partial discharge models and the flexible ranges of the push rods are calculated according to an insulation distance to enable the retracted partial discharge model not to affect the discharge performance of the extended partial discharge model. According to the device, the efficiency and accuracy of the partial discharge test for a GIS device are improved, and the potential personal security risk during the test is reduced.
Description
Technical field
The invention belongs to Cubicle Gas-Insulated Switchgear (GIS) High-Voltage Insulation test field, specifically refer to a kind of device that can realize GIS inside cavity partial discharge model and automatically switch in GIS partial discharge process of the test.
Background technology
Gas insulating enclosed switch equipment (GIS) adopts 3 ~ 6 atmospheric sulfur hexafluoride (SF
6) gas is as insulating medium, realize the electric insulation between high-pressure conductor and metal shell, high-pressure conductor then relies on the solid dielectric insulation such as disc insulator, supporting insulator to support.GIS is little with its floor area, and not by atmospheric effect, reliability height waits the use of premium properties in electric system increasingly extensive.But inside there will be the shelf depreciation because insulation defect causes, long-time development can cause insulation infringement, carries out detection seem particularly important to it.
In laboratory adopt from actual field GIS consistent size cavity among place the shelf depreciation of different partial discharge model to GIS and study, partial discharge model kind is a lot, for the different insulative defect in Simulated GlS equipment, as corona discharge model, creeping discharge model, bubble electric discharge model, suspended discharge model, particle discharging model etc.
Traditional experiment mode be design in GIS inside cavity place single shelf depreciation mould source type between high-field electrode and plate electrode and carry out correlation test, change other kind of class model again after a kind of model test completes.Because GIS inside is filled with high pressure SF6 gas, therefore, when studying the local discharge characteristic of different partial discharge model, the process changing model is very very long, and need to have a power failure the SF reclaimed in GIS cavity
6gas, then open GIS cavity and change model, and the lightweight packages such as cavity cover plate are also considerable, thus the efficiency of test is greatly reduced, cause unnecessary time delays, and change partial discharge model at every turn, make the correlated condition tested create a certain amount of difference in a way, test comparative on also can discount to some extent.Therefore design a kind of can realization and need not open the pilot system that GIS cavity carries out partial discharge model automatic switchover, for the efficiency improving GIS local discharge test and improve test figure accuracy for, have very positive meaning and very necessary.In addition on the one hand the physical construction of remote pilot achieve people electric with high-tension apparatus on completely isolated, reduce the risk of personal safety aspect potential in process of the test.
Summary of the invention
The object of the present invention is to provide a kind of partial discharge model switching device shifter be installed under hyperbar, realize the automatic switchover of the different partial discharge model of voltage levels GIS device inside cavity.
Particular content of the present invention is:
Partial discharge model switching device shifter is made up of partial discharge model [1], scalable push rod [2], hyperbar seal chamber [3], cavity high-field electrode [4] and controller [5], it is characterized in that: scalable push rod [2] can stretch out or retract under the control of controller [5], thus partial discharge model [1] is released make it contact cavity high-field electrode [4], or partial discharge model [1] is recalled make it away from cavity high-field electrode [4].
Wherein, partial discharge model [1], scalable push rod [2] and cavity high-field electrode [4] are all in hyperbar seal chamber [3] inside; It is outside that controller [5] is in hyperbar seal chamber [3].Partial discharge model [1] is fixed on scalable push rod [2], thus partial discharge model [1] can stretching out or retracting and move with scalable push rod [2].Scalable push rod [2] can only be in the state of stretching out or retracted mode; Wherein when scalable push rod [2] be in stretch out state time, the high-voltage contact [11] of partial discharge model [1] just in time contacts cavity high-field electrode [4]; When scalable push rod [2] is in retracted mode, high-voltage contact [11] and the cavity high-field electrode [4] of partial discharge model [1] disengage.When scalable push rod [2] is in retracted mode, the distance between the high-voltage contact [6] of partial discharge model [1] and cavity high-field electrode [4] is greater than the length of partial discharge model [1].Flexible push rod [2] is fixed on the end cap [7] of hyperbar seal chamber [3], and relative with cavity high-field electrode [4]; Space between hyperbar seal chamber [3] and cavity high-field electrode [4] is the mobile space of partial discharge model [1].Electrical connection between scalable push rod [2] and controller [5] is realized by the metal guide rod [21] being positioned at the through device [8] on end cap [7].Hyperbar seal chamber [3] and end cap [7] are made by metal material, and ground connection.
Wherein, partial discharge model [1] is made up of high-voltage contact [11], ground electrode [12], discharging gap [13] and insulating support [14], and wherein high-voltage contact [11] and ground electrode [12] are made by metal material; Be electrically connected with plain conductor between ground electrode [12] and end cap [7].
Through device [8] is made up of metal guide rod [21], nut [22], O-ring seal [23] and insulating mat [24]; Wherein have a boss [25] in the middle of metal guide rod [21], there is screw thread at two ends; During installation, metal guide rod [21] is through the hole on cover plate [7], makes boss [25] in hyperbar seal chamber [3], and is placed between boss [25] and cover plate [7] by O-ring seal [23]; Nut [22] is screwed in that side that metal guide rod [21] stretches out cover plate [7]; Insulating mat [24] is placed between nut [22] and cover plate [7]; One end that metal guide rod [21] is positioned at hyperbar seal chamber [3] connects the electrical wiring of scalable push rod [2], and metal guide rod [21] is positioned at the electrical wiring of hyperbar seal chamber [3] one end connection control device [5] outward.
The quantity of partial discharge model [1] and flexible push rod [2] can be greater than 2.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the overall profile schematic diagram of present system, only show two scalable push rods in figure, also there are two identical push rods with this profile vertical direction in reality, through device also only draws two to illustrate its mounting means, Fig. 1 (a) is design sketch when scalable push rod stretches out, and Fig. 1 (b) is design sketch during scalable pusher retracted.
Fig. 2 is the profile detail view in GIS inside cavity of present system.
Fig. 3 is the installation sectional view of through device.
Embodiment
The present embodiment provides high voltage partial discharge model switching device shifter under a kind of hyperbar be installed on 110kV electric pressure GIS cavity, and wherein switchable partial discharge model quantity is four.
(1) hyperbar seal chamber
Hyperbar seal chamber is that on one section of cavity on 110kVGIS equipment, its Main Function is for partial discharge model provides placement space.This hermetic seal cavity is made up of the metallic aluminium seal flange cover plate at metallic aluminium cylindrical cavity and top, and is isolated by all the other cavitys on disc insulator and GIS device.Hyperbar seal chamber and top flange cover plate require design according to the gas-insulated metal-enclosed equipment cavity of 110kV, and wherein the flange plate at top is partial discharge model, electric pushrod and through device provide mechanical erection and support.
(2) partial discharge model
Partial discharge model kind is a lot, is divided into spine, suspension, metallic particles, crackle etc., for the various different insulation defect of Simulated GlS device interior.Be made up of high-voltage contact, ground electrode, discharging gap and insulating support.By changing the concrete structure of discharging gap, spine, suspension, metallic particles, crackle electric discharge can be simulated respectively.The concrete structure of discharging gap can with reference to existing common version.
Partial discharge model is installed on the cylindrical insulating support that material is epoxy resin, and model bottom is enclosed with aluminum high-voltage contact, fully contacts during to ensure partial discharge test with high-field electrode; The insulating support other end is connected with scalable push rod, thus the contact that the scalable Telescopic moving back bar can be utilized to realize partial discharge model and high-field electrode be separated; The discharging gap place of partial discharge model between ground electrode and high-field electrode; Ground electrode is copper, be installed on insulating support, interelectrode apart from adjustable with bottom high-pressure, for the clearance distance of controls local electric discharge, be connected by copper wires between ground electrode with the flange plate of hyperbar seal chamber, achieve ground electrode and connection greatly.
(3) scalable push rod
Scalable push rod is commercially available electric pushrod, and material is stainless steel, realizes Telescopic by DC motor Driver push rod.The scalable push rod number that high pressure sealing cavity inside is installed is four, scalable push rod is screwed on high pressure sealing cavity flange plate, vertically downward, push rod end is connected with the insulating support of fixing partial discharge model the direction of motion of the scalable part of push rod.Simultaneously due to the high-field electrode of high-voltage conductive rod formation and the size limitations of electric pushrod itself, electric pushrod slopes inwardly 4 ° to ensure that partial discharge model can contact with high-field electrode.The wiring that scalable push rod is realized electrically by the through device of steel with the controller being positioned at high pressure sealing containment portion is connected, to realize the control to its flexible behavior.
(4) cavity high-field electrode
Cavity high-field electrode is the disc-shaped structure of a diameter 88mm, is connected, thus connects with the high-field electrode of GIS device, for partial discharge model provides trial voltage with through the metal conducting bar of disc insulator bottom hyperbar seal chamber.
(5) controller
It is outside that controller is positioned at hyperbar seal chamber, specifically refer to the DC power supplier and the supporting telepilot launching infra-red command thereof that are connected with the scalable push rod of hyperbar seal chamber inside, it is connected with the AC power of 220V, its Main Function is that the direct supply alternating current of 220V being converted to 24V exports, for the direct-drive motor of four the scalable push rods being placed in hyperbar seal chamber inside provides power supply, this DC power supplier is also assembled with infra-red remote control receiving loop simultaneously, the instruction of be equipped with telepilot can be received, telepilot are furnished with four groups of buttons, in order to realize controlling the independence of stretching out retract action of four scalable push rods respectively.
As shown in Figure 1, hyperbar seal chamber [3] is vertically installed on the GIS device platform of 110kV electric pressure, cavity [3] designs according to the GIS device size under actual motion condition completely, it is installed perpendicular to ground, internal diameter is 248mm, and the vertical range of cavity [3] from the bottom surface of upper flange cover plate [7] to bottom high-pressure guide rod electrode is 462.5mm.
Flange plate [7] material at the top of cavity [3] requires as 5A02 aluminium sheet, cover sheet thickness 20mm, shape is circular, cover plate diameter 345mm, flange plate [7] has the fastening through-hole 12 matched with cavity flange, diameter is 14mm, and the fastener hole center of circle is positioned on 12 Along ents of the circle of diameter 314mm.Cover plate roughness requirements is 6.3 μm, ensures to seal between cavity [3] flange and flange plate [7] with ethylene-propylene-diene monomer glue gasket.
Cover plate [7] is upper opens 8 through holes for through device, aperture 16mm, wherein 4 hole circle hearts be positioned overlap with cover plate [7] center of circle diameter 180mm circle fourth class branch on, the location of other four hole circle hearts overlap with cover plate [7] center of circle diameter 50mm circle fourth class branch on; Cover plate [7] close to the inner portion cavity side is the tapped blind hole that the firm banking of scalable push rod [2] opens 16 M6, hole depth 10mm; Vacant position, cover plate [7] inside cavities face also has the tapped blind hole of 1 dark 10mm of M8, for the installation of the grounding nut that ground electrode [5] ground wire is connected with shell; Cover plate [7] cavity lateral surface is provided with two stainless steel handles, so that dismantle flange plate in test installation process.
The DC power supplier of the controller [5] that cavity [3] is outside is connected with 220kV AC power and is converted into the driving direct current generator of scalable push rod [2] 24V DC voltage used, thus provide 24V direct supply for the drive motor of scalable push rod [2], DC power supplier is furnished with four jacks and is respectively four scalable push rods [2] and independently provides direct supply, the DC power supplier inside of same Time Controller [5] is furnished with the order of infrared remote-controlled signal receiver module acceptance from telepilot, for controlling the conversion of the positive-negative polarity of four supply hub power supplys, testing crew controls the polarity of direct supply output beyond safe distance by pressing action button corresponding on telepilot, the change of the rotation direction of scalable push rod [2] drive motor is realized by the upset exporting direct current polarity, thus to realizing the independent remote pilot of scalable push rod [2] Telescopic.
Because scalable push rod [2] is positioned at hyperbar seal chamber inside, in order to realize the electrical connection between scalable push rod [2] and the controller [5] being positioned at hyperbar seal chamber outside, the present invention devises corresponding through device [8] and reaches this purpose, the overall number of through device [8] is 8, each scalable push rod 2 need assemble 2, for passing flange plate, controller [5] is coupled together with the wiring of the scalable push rod [2] of GIS inside cavity, there is provided power supply for scalable push rod [2] and realize the control to its Telescopic, to ensure that good sealing prevents SF simultaneously
6the leakage of gas.
As shown in Figure 3, through device [8] overall material is stainless steel, and to ensure good electric conductivity and physical strength, through device [8] is the metal guide rod [21] of the screw thread that long 50mm is with M12 to have through flange plate [7] part; Metal guide rod [21] is positioned at inside cavity side with the boss [25] of thick 15mm diameter 30mm for press seal circle [23], thus realizes sealing function; O-ring seal [23] material is ethylene-propylene-diene rubber, and for the sealing between the sealing surface of boss [25] and flange plate, O-ring seal [23] internal diameter is 12mm, and sealing contact surface width is 9mm, and O-ring seal thickness is 2mm; The through-hole diameter that the upper through device [8] of flange plate [7] passes is 16mm; Metal guide rod [21] stretches out flange plate [7] cavity exterior side surface portion and divides the hexagonal flange nut 22 being equipped with M12 to match with the screw thread of its M12; Insulating mat [24] is arranged between nut [22] and cover plate [7], the material of insulating mat [24] is teflon, internal diameter mates with M12 screw thread, external diameter 28mm, insulating mat [24] inner ring side is with the tubular construction of the thick 2mm of high 10mm perpendicular to pad, object carries out insulation isolation, prevents metal guide rod [21] and institute from joining nut [22] and the flange plate [7] that is all metal material and come in contact and cause short circuit; Through device [8] two ends are the threaded rod of long 30mm, nominal diameter M6, for coordinating with the wiring nut of correspondence with link.
As shown in Figure 2, 4 scalable push rods [2] are screwed in the plane by hyperbar seal chamber [3] inner side of flange plate [7], due to scalable push rod [2] bottom with direct current generator, bottom it, area occupied is larger, the shared erection space of single scalable push rod [2] is about the square area that four edge lengths are all 75mm, through measuring and calculating, 4 scalable push rods [2] are completely perpendicular to the fixing high-voltage contact of partial discharge model [1] [11] cannot be made the to touch cavity high-field electrode [4] that diameter is 88mm of cover plate [7], in order to ensure the contact of partial discharge model [1] and cavity high-field electrode [4], need scalable push rod [2] oblique placement, vergence direction is for tilt 4 ° perpendicular to cover plate [7] bottom surface to hyperbar seal chamber internal axis line.Scalable push rod [2] proper length when moving lever is retracted is 130mm+ push rod stroke, push rod stroke and scalable push rod can the length of metal pushrod of [4] motion parts, time scalable push rod [2] will ensure that a push rod stretches out wherein, the high-voltage contact [11] being arranged on the partial discharge model [1] on remaining scalable push rod [2] is positioned at ground electrode [12] top of the partial discharge model tested, in order to avoid cause unnecessary interference, therefore push rod stroke is greater than the total length of partial discharge model [1] and its insulating bar [6], finally determine push rod stroke 110mm, flexible speed is 2.5mm/s.
Scalable push rod [2] end is connected with the insulating support 11 of partial discharge model [1], its connected mode is as follows: scalable push rod [2] end structure is the stainless steel cylinder of a diameter 20mm, there is the through hole of a diameter 6.5mm at distance push rod [1] end 9mm place perpendicular to this Cylinder Surface, mate its size at push rod [1] end and one aluminum metal cap is installed, metal cap is set in push rod [1] end and passes the fastened by screw of above-mentioned through hole with one, place of metal cap bottom centre has the threaded hole of a nominal diameter M16, the insulating support [14] of partial discharge model [1] is tightened by the threaded rod of ground electrode side position M16 on this metal cap by this threaded hole, thus realize the connection of partial discharge model [1] and scalable push rod [2] and fix.
Insulating support [13] material of partial discharge model is epoxy resin, it is the cylinder of a diameter 18mm length 110mm, insulating support top is namely by the screw thread of scalable push rod [2] end side with M16 length 65mm, bottom and high-field electrode [4] contact side stud with aluminum high-voltage contact, account for the 15mm in insulating support total length.
The insulating support [13] of partial discharge model [1] is equipped with ground electrode [12] by scalable push rod [2] side, ground electrode material is copper, circular, diameter 70mm, thickness 10mm, edge does the process of R5 rounded corners, M16 threaded hole is opened in center, match with the screw thread of the M16 of the insulating support [13] of partial discharge model [1], the distance of itself and cavity high-field electrode [4] can be regulated by the mode rotated, side by side electrode [12] is carried on the back towards high-field electrode [7] side with tubular construction, on it, installation one holding screw prevents from loosening with electrode regularly, insulating support [13] is cut perpendicular to its bottom cylindrical face on screw thread and cuts a plane, for the fixing surface of contact as holding screw, ground electrode [12] back of the body has the tapped blind hole of M6 on the face of cavity high-field electrode [4], hole depth 6mm, and be equipped with holding screw, for installing the ground wire be connected with shell cavity, can not there is edge flashing when will ensure nearest from high-field electrode [7] in the operating range of ground electrode [12], also want to ensure generation model having shelf depreciation, through consulting related data, epoxy resin is at the SF of 0.4MPa simultaneously
6when gaseous environment high-low pressure interelectrode distance is 20mm, its flashover voltage is up to about 400kV, therefore, the spacing of this experiment system design ground electrode [12] and cavity high-voltage contact [11] minimum for 30mm be the impact can avoiding edge flashing.
The discharging gap of partial discharge model [1] is positioned at insulating support [13] between ground electrode [12] and high-voltage contact [11], is the concrete partial discharge model of the various insulation defect of simulation therebetween.
When carrying out partial discharge model correlation test, after connecting associated connections, the infrared remote controller of testing crew in safe distance accidental operation hand controls a release in multiple scalable push rod [2], make the high-voltage contact of shelf depreciation electric model [1], close cavity high-field electrode [4] also comes in contact with it, then start correlation test, after having tested, control scalable pusher retracted belonging to this partial discharge model [1] by telepilot; After this partial discharge model is regained completely, then control the scalable push rod of another one and stretch out downwards, thus achieve the automatic switchover of partial discharge model, midway does not need the SF that releases
6, open cavity artificial replacement discharging model, and then reach and improve test efficiency, the object that ensures personal safety.
Claims (11)
1. high voltage partial discharge model switching device shifter under a hyperbar, be made up of partial discharge model [1], scalable push rod [2], hyperbar seal chamber [3], cavity high-field electrode [4] and controller [5], it is characterized in that: scalable push rod [2] can stretch out or retract under the control of controller [5], thus partial discharge model [1] is released make it contact cavity high-field electrode [4], or partial discharge model [1] is recalled make it away from cavity high-field electrode [4].
2. high voltage partial discharge model switching device shifter under hyperbar according to claim 1, is characterized in that: it is inner that partial discharge model [1], scalable push rod [2] and cavity high-field electrode [4] are all in hyperbar seal chamber [3]; It is outside that controller [5] is in hyperbar seal chamber [3].
3. high voltage partial discharge model switching device shifter under hyperbar according to claim 1, it is characterized in that: partial discharge model [1] is fixed on scalable push rod [2], thus partial discharge model [1] can stretching out or retracting and move with scalable push rod [2].
4. high voltage partial discharge model switching device shifter under hyperbar according to claim 1, is characterized in that: scalable push rod [2] can only be in the state of stretching out or retracted mode; Wherein when scalable push rod [2] be in stretch out state time, the high-voltage contact [11] of partial discharge model [1] just in time contacts cavity high-field electrode [4]; When scalable push rod [2] is in retracted mode, high-voltage contact [11] and the cavity high-field electrode [4] of partial discharge model [1] disengage.
5. high voltage partial discharge model switching device shifter under hyperbar according to claim 1, it is characterized in that: when scalable push rod [2] is in retracted mode, the distance between the high-voltage contact [6] of partial discharge model [1] and cavity high-field electrode [4] is greater than the length of partial discharge model [1].
6. high voltage partial discharge model switching device shifter under hyperbar according to claim 1, is characterized in that: flexible push rod [2] is fixed on the end cap [7] of hyperbar seal chamber [3], and relative with cavity high-field electrode [4]; Space between hyperbar seal chamber [3] and cavity high-field electrode [4] is the mobile space of partial discharge model [1].
7. high voltage partial discharge model switching device shifter under hyperbar according to claim 1, is characterized in that: the electrical connection between scalable push rod [2] and controller [5] is realized by the metal guide rod [21] being positioned at the through device [8] on end cap [7].
8. high voltage partial discharge model switching device shifter under hyperbar according to claim 1, is characterized in that: hyperbar seal chamber [3] and end cap [7] are made by metal material, and ground connection.
9. high voltage partial discharge model switching device shifter under hyperbar according to claim 1, it is characterized in that: partial discharge model [1] is made up of high-voltage contact [11], ground electrode [12], discharging gap [13] and insulating support [14], wherein high-voltage contact [11] and ground electrode [12] are made by metal material; Be electrically connected with plain conductor between ground electrode [12] and end cap [7].
10. through device [8] according to claim 7, is characterized in that: through device [8] is made up of metal guide rod [21], nut [22], O-ring seal [23] and insulating mat [24]; Wherein have a boss [25] in the middle of metal guide rod [21], there is screw thread at two ends; During installation, metal guide rod [21] is through the hole on cover plate [7], makes boss [25] in hyperbar seal chamber [3], and is placed between boss [25] and cover plate [7] by O-ring seal [23]; Nut [22] is screwed in that side that metal guide rod [21] stretches out cover plate [7]; Insulating mat [24] is placed between nut [22] and cover plate [7]; One end that metal guide rod [21] is positioned at hyperbar seal chamber [3] connects the electrical wiring of scalable push rod [2], and metal guide rod [21] is positioned at the electrical wiring of hyperbar seal chamber [3] one end connection control device [5] outward.
High voltage partial discharge model switching device shifter under 11. hyperbars according to claim 1, is characterized in that: the quantity of partial discharge model [1] and flexible push rod [2] can be greater than 2.
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| CN110850245A (en) * | 2019-11-19 | 2020-02-28 | 国网浙江平湖市供电有限公司 | Cubical switchboard partial discharge analogue means based on automatic control |
| CN110865285A (en) * | 2019-11-19 | 2020-03-06 | 国网浙江平湖市供电有限公司 | Switch cabinet partial discharge test model device |
| CN113721118A (en) * | 2021-09-26 | 2021-11-30 | 华北电力大学 | Ultraviolet imaging simulation experiment device for discharge of burr type defect on surface of conducting wire |
| CN117538712A (en) * | 2024-01-09 | 2024-02-09 | 保定天威新域科技发展有限公司 | Discharge type and position switching device and discharge model |
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| CN105004970B (en) | 2018-04-06 |
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