CN208314118U - The flashover voltage of the insulator detection device in mixed gas under cryogenic conditions - Google Patents
The flashover voltage of the insulator detection device in mixed gas under cryogenic conditions Download PDFInfo
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- CN208314118U CN208314118U CN201820665706.3U CN201820665706U CN208314118U CN 208314118 U CN208314118 U CN 208314118U CN 201820665706 U CN201820665706 U CN 201820665706U CN 208314118 U CN208314118 U CN 208314118U
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- mixed gas
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Abstract
The utility model provides under a kind of cryogenic conditions the flashover voltage of the insulator detection device in mixed gas, is related to high-voltage electricity experimental technique field.The device includes high voltage power supply, SF6Mixed gas charge and discharge and recyclable device, low temperature setting circuit and holding meanss and the flashover voltage of the insulator measuring device；SF6Mixed gas charge and discharge is connected with the flashover voltage of the insulator measuring device respectively with recyclable device, low temperature setting circuit with holding meanss and high voltage power supply, and realization carries out inflation/deflation and gas recycling, cooling to it and keeps and provide high pressure.The flashover voltage of the insulator detection device in mixed gas under cryogenic conditions provided by the utility model, the purity that greatly ensure that mixed gas, reduces stratification of hot gas phenomenon, has been accurately controlled the mixing ratio of mixed gas, it improves the utilization of resources and saves experimental cost, substantially realization SF6Zero-emission into atmosphere.
Description
Technical field
The utility model relates to insulate in mixed gas under high-voltage electricity experimental technique field more particularly to a kind of cryogenic conditions
Sub- flashover voltage detection device.
Background technique
SF6Gas is widely used in gas insulating enclosed switch equipment because having good insulation and blow-out performance
(GIS) and in the air insulation electric power apparatus such as gas-insulated metal closed power transmission line (GIL).But SF6With stronger temperature
Room effect, SF6The global warming potential (global warming potential, GWP) of gas is the 23900 of carbon dioxide
Times.By SF in the Kyoto Protocol of signature in 19976Gas is determined as needing to limit one of the greenhouse gases used.
Meanwhile SF6The higher condensing temperature of gas limits it in the use of low temperature severe cold area.With electric system development and
The environmental protection problem got worse is badly in need of finding tradition SF6The substitution gas of gas is to meet power equipment environmentally friendly and low
The demand of temperature application etc..For a long time, people are to find SF6The substitution gas of gas has conducted extensive research, but not yet
It was found that a kind of can substitute SF completely in terms of insulation performance6The gas of gas, then people are sought for using SF6Gaseous mixture
Body (such as SF6/N2、SF6/CF4Mixed gas) it is used as dielectric, it can not only reduce the condensing temperature of insulating gas, Er Qieke
To reduce SF6The usage amount of gas.And the operating experience in the high pressure gas insulation electrical equipment such as GIL shows insulator
Edge flashing occupies sizable ratio in apparatus insulated failure.In recent years, gas-solid interface occur along face exception flashover
Caused equipment damage or system large area blackout at home and abroad have been reported that.
Utility model content
In view of the drawbacks of the prior art, the utility model provides under a kind of cryogenic conditions insulator arc-over electricity in mixed gas
Detection device is pressed, realizes the voltage detecting to insulator arc-over in mixed gas.
The utility model provides under a kind of cryogenic conditions the flashover voltage of the insulator detection device in mixed gas, including high pressure
Power-supply system, SF6Mixed gas charge and discharge and recyclable device, low temperature setting circuit and holding meanss and the flashover voltage of the insulator measure
Device；
The SF6Mixed gas charge and discharge and recyclable device include two and store SF respectively6The high pressure of gas and another gas
Gas cylinder, compressor, filters absorption of device and vacuum pump at mixed gas air accumulator；Described two high pressure gas cylinders respectively with gaseous mixture
Two air inlets of body air accumulator are connected, and mixed gas air accumulator is separately connected compressor and vacuum by gas connection pipe road
Pump, vacuum pump connection filter absorption of device；
Low temperature setting circuit and holding meanss include low temperature secret room, compressor, heat exchanger, reservoir, condenser,
Expansion valve and temperature control system；The low temperature setting circuit and holding meanss pass through connection in SF6Mixed gas charge and discharge
Between recyclable device and the flashover voltage of the insulator measuring device；The compressor, heat exchanger, condenser, expansion valve and storage
Storage circuit in series；The temperature control system is separately connected low temperature secret room, heat exchanger and expansion valve by route；Institute
Heat exchanger is stated to be connected by route with mixed gas air accumulator；
The flashover voltage of the insulator measuring device includes two finger electrodes, mixed gas sealed air chamber, solid is noninductive
Current-limiting resistance, RC divider and digital high pressure gauge；Two finger electrodes are separately fixed at mixed gas by conductor connecting rod
The upper and lower side of sealed air chamber, it is positive electrode that the finger electrodes connecting with mixed gas sealed air chamber upper end, which connect high potential, and is mixed
The finger electrodes of air seal gas chamber lower end connection are negative electrode, regulate the finger electrodes spacing of setting, and noninductive with solid
Current-limiting resistance, high voltage power supply pass through connection line circuit in series；The mixed gas sealed air chamber is placed on low temperature
In secret room, and low temperature is connected by gas piping and sets circuit and the heat exchanger in holding meanss；Mixed gas sealed air chamber
Upper end the positive output end of high voltage power supply is connected with disc insulator by high-pressure conductor, under mixed gas sealed air chamber
End is connected by the negative output terminal of conductor and high voltage power supply；The high-voltage end of the RC divider is connected to high voltage power supply system
For system in the connection line of low temperature secret room, the low-pressure end of RC divider connects digital high pressure gauge, the ground terminal of RC divider
Ground connection.
Preferably, the high voltage power supply include: capacitor, rectifier diode, second resistance, transformer, pressure regulator and
Power frequency AC；The power frequency AC connects pressure regulator, and pressure regulator connects primary coil of transformer, the by-pass of transformer
One end of one end connection second resistance is enclosed, the other end of the secondary coil of transformer is used as high voltage power supply system after connecting with capacitor one end
The negative output terminal of system, the second resistance other end connect rectifier diode anode, and rectifier diode cathode is connect with the capacitor other end
Afterwards as the positive output end of high voltage power supply.
Preferably, another gas is with certain dielectric strength and the lower gas of condensing temperature, including tetrafluoro
Change carbon, nitrogen, carbon dioxide, c-C4F8, CF3I。
Preferably, described two finger-like structure electrodes, electrode material are brass, and front end radius of curvature is 8mm, and surface carries out
Polishing treatment；Insulator sample is fitted closely by the fixation of insulating support plate and bolt with two finger electrodes, and insulated bolt can
Adjust two finger electrodes spacing.
Preferably, be equipped on the connecting line of described two high pressure gas cylinders and mixed gas air accumulator gas flowmeter and
Switch；Gas flowmeter and switch also are provided on the pipeline that the mixed gas air accumulator is connect with heat exchanger；Meanwhile it mixing
Protective device is additionally provided on gas storage tank, the protective device is safety valve.
Preferably, at sealed air chamber lower end on the pipeline that the mixed gas sealed air chamber is connected with compressor
Equipped with pressure gauge；A quartz glass window is further respectively had on the two sidewalls of the mixed gas sealed air chamber.
As shown from the above technical solution, the utility model has the beneficial effects that: a kind of low temperature provided by the utility model
Under the conditions of the flashover voltage of the insulator detection device in mixed gas, mixed gas air accumulator is believed that zero leakage, gas with various by
Different air inlets enters, and greatly ensure that the purity of mixed gas.SF6Mixed gas gas storage is blended in another gas
In tank, mixed gas can be made quickly to be sufficiently mixed, stratification of hot gas phenomenon can be greatly reduced.The mixing of gas passes through gas flowmeter
Control, hybrid mode convenience and high-efficiency can control the mixing ratio of mixed gas with high accuracy.SF6Mixed gas charge and discharge and recycling
The recycling of the achievable mixed gas of device improves the utilization of resources and saves experimental cost, substantially realization SF6To atmosphere
In zero-emission.
Detailed description of the invention
Fig. 1 is the flashover voltage of the insulator detection in mixed gas under a kind of cryogenic conditions provided by the embodiment of the utility model
The structural block diagram of device；
Fig. 2 is the connection structure diagram of high voltage power supply provided by the embodiment of the utility model；
Fig. 3 is finger-type electrode structure schematic diagram provided by the embodiment of the utility model；
Fig. 4 is the flashover voltage of the insulator detection method in mixed gas under cryogenic conditions provided by the embodiment of the utility model
Flow chart.
In figure: 1, RC divider；2, high-pressure conductor；3, disc insulator；4, low temperature secret room；5, mixed gas blanket gas
Room；6, insulator sample；7, quartz glass window；8, conductor connecting rod；9, compressor；10, expansion valve；11, high pressure gas cylinder；
12, rectifier diode；13, transformer；14, pressure regulator；15, power frequency AC；16, positive output end；17, negative output terminal；
18, insulating support plate；19, finger electrodes；20, insulated bolt.
Specific embodiment
With reference to the accompanying drawings and examples, specific embodiment of the present utility model is described in further detail.Below
Embodiment is not intended to limit the scope of the present invention for illustrating the utility model.
The utility model provides under a kind of cryogenic conditions the flashover voltage of the insulator detection device in mixed gas, such as Fig. 1 institute
Show, including high voltage power supply, SF6Mixed gas charge and discharge and recyclable device, low temperature setting circuit and holding meanss, insulator dodge
Network voltage measuring apparatus.
High voltage power supply is as shown in Figure 2, comprising: capacitor C, rectifier diode 12, second resistance R2, transformer 13, adjusts
Depressor 14 and power frequency AC 15.Power frequency AC 15 connects pressure regulator 14, and pressure regulator 14 connects the former line of transformer 13
Circle, secondary coil one end of transformer 13 connect the one end second resistance R2, the other end of the secondary coil of transformer 13 and the one end capacitor C
As the negative output terminal of high voltage power supply 17 after connection, the second resistance R2 other end connects 12 anode of rectifier diode, rectification
Positive output end 16 as high voltage power supply after 12 cathode of diode is connect with the capacitor C other end.
SF6Mixed gas charge and discharge and recyclable device include two and store SF respectively6The high pressure gas cylinder of gas and another gas
11, mixed gas air accumulator, compressor 9, filter absorption of device and vacuum pump.Another gas be with certain dielectric strength and
The lower gas of condensing temperature, including carbon tetrafluoride, nitrogen, carbon dioxide, c-C4F8, CF3I.Two high pressure gas cylinders 11 respectively with
Two air inlets of mixed gas air accumulator are connected, and mixed gas air accumulator is separately connected compressor 9 by gas connection pipe road
And vacuum pump, vacuum pump connection filter absorption of device.Gas charge and discharge is used to store up mixed gas with the compressor 9 in recyclable device
Mixed gas in gas tank is filled in sealed air chamber, or the mixed gas in sealed air chamber is recycled to mixed gas air accumulator
In；Vacuum pump is for vacuumizing sealed air chamber or air accumulator.
Meanwhile gas flowmeter G1, G2 are equipped on the connecting line of two high pressure gas cylinders 11 and mixed gas air accumulator
And switch K1, K2, the amount of air accumulator is entered for controlling gas, realizes SF6Gas is mixed with another gas arbitrary proportion
It closes；It is additionally provided with the safety valve as protective device on mixed gas air accumulator, is more than setting for working as gas pressure in air accumulator
Compressor is controlled when value to disconnect automatically.
It includes internal diameter as 350mm that low temperature, which sets circuit and holding meanss, the low temperature secret room 4 of a height of 300mm, compressor 9, heat
Exchanger, reservoir, condenser, expansion valve 10 and temperature control system.Low temperature sets circuit and holding meanss and is connected by route
It connects in SF6Between mixed gas charge and discharge and recyclable device and the flashover voltage of the insulator measuring device；It is compressor 9, heat exchanger, cold
Condenser, expansion valve 10 and reservoir circuit in series；Temperature control system is separately connected low temperature secret room 4 by route, heat is handed over
Parallel operation and expansion valve 10；Heat exchanger is connected by route with air accumulator, and the route of connection is equipped with gas flowmeter G3 and opens
Close K3.The low temperature secret room 4 of low-temperature circuit is suitable for for mixed gas sealed air chamber 5 being isolated with external environment, keeps low temperature；Compression
Machine 9 is used to be that condenser uses after gas compression；Air is converted to liquid storage in reservoir by condenser, and liquid leads to again
It crosses expansion valve and enters heat exchanger, heat exchanger cools down to mixed gas by evaporation endothermic.
The flashover voltage of the insulator measuring device includes two finger electrodes 19, mixed gas sealed air chamber 5, solid is noninductive limit
Leakage resistance R, RC divider 1 and digital high pressure gauge.The material of two finger electrodes 19 is brass, and front end radius of curvature is 8mm,
Surface is processed by shot blasting；Insulator sample 6 is as shown in figure 3, the fixation and two finger-types for passing through insulating support plate 18 and bolt 20
Electrode 19 fits closely, and guarantees the accuracy of experiment；The spacing of two finger electrodes 19 is adjusted by insulated bolt 20, realizes measurement
The flashover voltage of insulator sample 6 under difference electric discharge spacing.Two finger electrodes 19 are separately fixed at by conductor connecting rod 8
The upper and lower side of mixed gas sealed air chamber 5, the finger electrodes 19 connecting with mixed gas sealed air chamber 5 upper end connect high potential and are positive
Electrode, the finger electrodes 19 connecting with mixed gas sealed air chamber 5 lower end are negative electrode, regulate the electrode spacing of setting, and
Pass through connection line circuit in series with the noninductive current-limiting resistance R of solid, high voltage power supply；Mixed gas sealed air chamber 5 puts
It sets in low temperature secret room 4, and low temperature is connected by gas piping and sets circuit and the heat exchanger in holding meanss；Mixed gas
The upper end of sealed air chamber 5 connects the positive output end 16 of high voltage power supply, gaseous mixture by high-pressure conductor 2 and disc insulator 3
The lower end of body sealed air chamber 5 is connected by the negative output terminal 17 of conductor and high voltage power supply；The high-voltage end of RC divider 1 connects
It is connected in the connection line of high voltage power supply and low temperature secret room 4, the low-pressure end of RC divider 1 connects digital high pressure gauge, resistance
Hold the ground terminal ground connection of divider 1.High-pressure conductor 2 plays conductive and connection, and disc insulator 3 mainly plays insulation and support
Effect；Solid is noninductive, and current-limiting resistance R plays the role of the current-limiting protection to route；RC divider 1 and digital high pressure gauge play
The effect of transient voltage when measurement 6 flashover of insulator sample.
Meanwhile it being equipped on the pipeline that is connected with compressor of mixed gas sealed air chamber 5 at sealed air chamber lower end
Pressure gauge, for monitoring the gas pressure situation for entering sealed air chamber；It is also set respectively on the two sidewalls of mixed gas sealed air chamber 5
There is a quartz glass window 7, facilitates the flashover on observation 6 surface of insulator sample.
The present embodiment additionally provide using the flashover voltage of the insulator detection device in mixed gas under above-mentioned cryogenic conditions into
The method that the flashover voltage of the insulator detects in mixed gas under row cryogenic conditions, as shown in Figure 4, comprising the following steps:
Step 1: the distance between positive electrode and negative electrode of mixed gas sealed air chamber 5 are adjusted, to change insulator
The arcing distance of 6 flashover of sample；
Step 2: removing gas remaining in mixed gas sealed air chamber 5 using gas charge and discharge and recyclable device, then will
Mixed gas sealed air chamber 5 vacuumizes；
Step 3: under the switch K3 closed state on the pipeline that mixed gas air accumulator is connect with heat exchanger, according to institute
It needs the different ratio of mixed gas to inflate into mixed gas air accumulator and stands appropriate time；
Step 4: circuit is set by low temperature and holding meanss adjust the required cryogenic temperature of the flashover voltage of the insulator detection,
After temperature is stablized in air seal gas chamber 5 to be mixed, it is made to keep this temperature-resistant；
Step 5: the mixed gas in mixed gas air accumulator being filled in mixed gas sealed air chamber 5, is set until reaching
Level pressure intensity values；
Step 6: DC voltage is applied to the insulator sample 6 in mixed gas sealed air chamber 5 using high voltage power supply,
And it is boosted using uniform speed slow boosting mode；It is observed absolutely by the quartz glass window 7 of 5 two sides of mixed gas sealed air chamber
The surface condition of edge sample 6 stops pressurization when along face flashover occurs for insulator sample 6, keeps the power switch in route disconnected
It opens；And the flashover voltage of insulator sample 6 at this time is read by digital high voltage table；
Step 7: this characteristic of certain self-reparability being had according to the insulator surface of solids, is spaced five minutes, wait insulate
Sub- 6 surface insulation characteristic of sample restores, and repeats step 6, measures the flashover of the insulator sample 6 in 5 mixed gas sealing chambers 5
Voltage value, and average；
Step 8: increasing by 5 positive and negative electrode spacing of mixed gas sealed air chamber, repeat step 4- step 7, obtain different electricity
The flashover voltage value of insulator sample 6 of the interpolar away under；
In the present embodiment, 5 positive and negative electrode spacing of mixed gas sealed air chamber successively increases to 7mm, step-length 2 from 3mm
mm。
Step 9: increasing atmospheric pressure value in mixed gas sealed air chamber 5, repeat step 6- step 8, obtain under different pressure
Insulator sample 6 flashover voltage value；
In the present embodiment, adjusting gas pressure intensity in mixed gas sealed air chamber 5 successively increases to 0.4M Pa from 0.1M Pa,
Step-length is 0.1M Pa.
Step 10: using the mixed gas in gas charge and discharge and recyclable device extraction mixed gas sealed air chamber 5；
Step 11: the mixed proportion of mixed gas in change mixed gas sealed air chamber 5, the insulator sample 6 more renewed,
Step 5- step 9 is repeated, the flashover voltage of the insulator value under the conditions of gas with various mixed proportion is obtained.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that:
It can still modify to technical solution documented by previous embodiment, or to some or all of the technical features
It is equivalently replaced；And these are modified or replaceed, it does not separate the essence of the corresponding technical solution, and the utility model right is wanted
Seek limited range.
Claims (6)
1. the flashover voltage of the insulator detection device in mixed gas under a kind of cryogenic conditions, it is characterised in that: including high voltage power supply
System, SF6Mixed gas charge and discharge and recyclable device, low temperature setting circuit and holding meanss and the flashover voltage of the insulator measurement fill
It sets；
The SF6Mixed gas charge and discharge and recyclable device include two and store SF respectively6The high pressure gas of gas and another gas
Bottle, compressor, filters absorption of device and vacuum pump at mixed gas air accumulator；Described two high pressure gas cylinders respectively with mixed gas
Two air inlets of air accumulator are connected, and mixed gas air accumulator is separately connected compressor and vacuum pump by gas connection pipe road,
Vacuum pump connection filters absorption of device；
The low temperature setting circuit and holding meanss include low temperature secret room, compressor, heat exchanger, reservoir, condenser, expansion
Valve and temperature control system；The low temperature setting circuit and holding meanss pass through connection in SF6Mixed gas charge and discharge with return
Between receiving apparatus and the flashover voltage of the insulator measuring device；The compressor, heat exchanger, condenser, expansion valve and reservoir
Circuit in series；The temperature control system is separately connected low temperature secret room, heat exchanger and expansion valve by route；The heat
Exchanger is connected by route with mixed gas air accumulator；
The flashover voltage of the insulator measuring device includes two finger electrodes, mixed gas sealed air chamber, solid is noninductive current limliting
Resistance, RC divider and digital high pressure gauge；Two finger electrodes are separately fixed at mixed gas sealing by conductor connecting rod
The upper and lower side of gas chamber, it is positive electrode that the finger electrodes connecting with mixed gas sealed air chamber upper end, which connect high potential, with mixed gas
The finger electrodes of sealed air chamber lower end connection are negative electrode, regulate the finger electrodes spacing of setting, and with the noninductive current limliting of solid
Resistance, high voltage power supply pass through connection line circuit in series；The mixed gas sealed air chamber is placed on low temperature secret room
It is interior, and low temperature is connected by gas piping and sets circuit and the heat exchanger in holding meanss；Mixed gas sealed air chamber it is upper
End connects the positive output end of high voltage power supply by high-pressure conductor with disc insulator, and the lower end of mixed gas sealed air chamber is logical
The negative output terminal for crossing conductor and high voltage power supply connects；The high-voltage end of the RC divider be connected to high voltage power supply with
In the connection line of low temperature secret room, the low-pressure end of RC divider connects digital high pressure gauge, the ground terminal ground connection of RC divider.
2. the flashover voltage of the insulator detection device, feature exist in mixed gas under cryogenic conditions according to claim 1
In: the high voltage power supply includes: capacitor, rectifier diode, second resistance, transformer, pressure regulator and power frequency AC；
The power frequency AC connects pressure regulator, and pressure regulator connects primary coil of transformer, secondary coil one end connection of transformer the
Two resistance one end, negative output terminal as high voltage power supply after the other end of the secondary coil of transformer is connect with capacitor one end,
The second resistance other end connects rectifier diode anode, and rectifier diode cathode is used as high voltage power supply after connecting with the capacitor other end
The positive output end of system.
3. the flashover voltage of the insulator detection device, feature exist in mixed gas under cryogenic conditions according to claim 1
In: the another kind gas is with certain dielectric strength and the lower gas of condensing temperature, including carbon tetrafluoride, nitrogen, two
Carbonoxide, c-C4F8, CF3I。
4. the flashover voltage of the insulator detection device, feature exist in mixed gas under cryogenic conditions according to claim 1
In: described two finger-like structure electrodes, electrode material are brass, and front end radius of curvature is 8mm, and surface is processed by shot blasting；Absolutely
Edge sample is fitted closely by the fixation of insulating support plate and bolt with two finger electrodes, and two finger-types electricity is adjusted in insulated bolt
Interpolar away from.
5. the flashover voltage of the insulator detection device, feature exist in mixed gas under cryogenic conditions according to claim 1
In: gas flowmeter and switch are equipped on the connecting line of described two high pressure gas cylinders and mixed gas air accumulator；It is described mixed
It closes and also is provided with gas flowmeter and switch on the pipeline that gas storage tank is connect with heat exchanger；Meanwhile mixed gas air accumulator
On be additionally provided with protective device, the protective device is safety valve.
6. the flashover voltage of the insulator detection device, feature exist in mixed gas under cryogenic conditions according to claim 1
In: pressure gauge is being equipped at sealed air chamber lower end on the pipeline that the mixed gas sealed air chamber is connected with compressor；
A quartz glass window is further respectively had on the two sidewalls of the mixed gas sealed air chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820665706.3U CN208314118U (en) | 2018-05-07 | 2018-05-07 | The flashover voltage of the insulator detection device in mixed gas under cryogenic conditions |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820665706.3U CN208314118U (en) | 2018-05-07 | 2018-05-07 | The flashover voltage of the insulator detection device in mixed gas under cryogenic conditions |
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| Publication Number | Publication Date |
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| CN208314118U true CN208314118U (en) | 2019-01-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820665706.3U Expired - Fee Related CN208314118U (en) | 2018-05-07 | 2018-05-07 | The flashover voltage of the insulator detection device in mixed gas under cryogenic conditions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490326A (en) * | 2018-05-07 | 2018-09-04 | 沈阳工业大学 | The flashover voltage of the insulator detection device and method in mixed gas under cryogenic conditions |
-
2018
- 2018-05-07 CN CN201820665706.3U patent/CN208314118U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108490326A (en) * | 2018-05-07 | 2018-09-04 | 沈阳工业大学 | The flashover voltage of the insulator detection device and method in mixed gas under cryogenic conditions |
| CN108490326B (en) * | 2018-05-07 | 2023-11-28 | 沈阳工业大学 | Device and method for detecting flashover voltage of insulator in mixed gas under low temperature condition |
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Granted publication date: 20190101 |