CN102253319A - Solid insulation voltage resistance performance test system under high voltage and low temperature Paschen condition - Google Patents
Solid insulation voltage resistance performance test system under high voltage and low temperature Paschen condition Download PDFInfo
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- CN102253319A CN102253319A CN2011101130884A CN201110113088A CN102253319A CN 102253319 A CN102253319 A CN 102253319A CN 2011101130884 A CN2011101130884 A CN 2011101130884A CN 201110113088 A CN201110113088 A CN 201110113088A CN 102253319 A CN102253319 A CN 102253319A
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Abstract
The invention discloses a solid insulation voltage resistance performance test system under a high voltage and low temperature Paschen condition. The solid insulation voltage resistance performance test system comprises a detection container and a substance to be tested, wherein the substance to be tested is suspended in the detection container; an insulation socket is arranged on the side face of the detection container; the substance to be tested comprises a metal tube; an insulation layer to be tested is coiled outside the metal tube; both ends of the metal tube are fixedly communicated with extension tubes with closed outer ends respectively; insulators are additionally arranged on the extension tubes respectively; insulation layers are additionally coiled on the extension tubes and the insulators respectively to form extension sections; the extension sections are led out of holes formed on the front end face and the rear end face of the detection container respectively; a temperature sensor is arranged on the insulation layer to be tested and an aluminum foil is wrapped on the insulation layer to be tested so as to form a grounding pole; and a measurement line of the temperature sensor and the aluminum foil grounding pole are lead out of the insulation socket. By the solid insulation voltage resistance performance test system, Paschen condition electric performance test of a solid insulation layer of a high voltage part of a large-size superconducting magnet can be realized; and the problems of a voltage resistance performance test method and a judgment measure of a high voltage insulation part working in a vacuum environment can be solved basically.
Description
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Technical field:
The present invention relates generally to, and relates in particular to be used for solid insulation withstand voltage properties test macro under the large-scale superconducting magnet system high voltage low temperature Paschen condition.
Background technology:
The Paschen law is the gas discharge fundamental characteristics, main describe be gas breakdown voltage V with gas atmosphere p and high electronegative potential apart from nonlinear function between the d, the Paschen that adopts the method for experiment test can the draw gas with various function V=f (pd) that discharges.In general when high electronegative potential distance one timing (being that electrode position is fixed), the voltage breakdown of gas minimum value occurs under some specific air pressure conditions, this voltage breakdown of normal conditions is tens to a few hectovolt magnitudes, we call Paschen discharge minimal condition to minimum sparking voltage point in the Paschen discharge funtcional relationship, are called for short the Paschen condition.
For large-scale superconducting magnet system, wherein most of high-voltage parts as superconducting magnet, supercurrent feeder line, current feed, insulator etc., all are to be operated in the high vacuum environment, and vacuum tightness can reach 10
-5Pa even higher level, high-voltage discharge phenomenon between so good vacuum condition bottom electrode is impossible substantially, in case destroying or fault appears in vacuum system, break etc. as vacuum tank leakage accident, helium or nitrogen cooling line, high-voltage part in the superconducting magnet system will be directly exposed in the gaseous environment than low vacuum, and the Paschen condition is as easy as rolling off a log to be reached.All high-voltage parts in the superconducting magnet system all must carry out the solid insulating layer protection for this reason; with the discharge path between the isolated high electronegative potential; but because magnet system operates in complex electromagnetic environment; electromagnetic force load greater than 10 tons/m directly acts on the insulation course; the huge thermal stress that thermograde from room temperature to the 4K warm area causes when system cools is lowered the temperature and produce the axial deformation of nearly 100mm in addition; the employed insulating material of system must be able to bear harsh service condition; must not ftracture; the aging physical damnification that waits, voltage and the leakage current record that electric discharge phenomena take place in the 100Pa helium environment in the back appears destroying in the epoxy insulation layer that is shown in Figure 1.So in the process of the high-voltage part of superconducting magnet system insulation preparation, need to carry out strict quality test, except the cryogenic mechanics performance check, the low temperature electric property
Must not ignore, and traditional atmospheric environment voltage-withstand test can not satisfy the testing requirement of superconducting magnet system, by contrast the direct current proof voltage of low temperature Paschen condition test with its more can the effecting reaction actual operating mode test environment more and more be subjected to the attention of Related Research Domain.
At present various about the testing standard kind order of insulation electrical withstand voltage properties both at home and abroad, but rare report about the test of Paschen condition proof voltage, the anti-electrical testing of Paschen condition under the low temperature environment rarely has especially to be heard of, therefore developing this type insulated electro performance means of testing, set up and improve the dependence test platform, all is of great advantage for fields such as superconductor applications, high-energy physics.
Summary of the invention:
The object of the invention is exactly in order to remedy the defective of prior art, a kind of solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition that is used for is provided, it can realize the Paschen condition electric performance test for large-scale superconducting magnet high voltage appearance parts solid insulating layer, the High-Voltage Insulation parts that are in vacuum environment work have fundamentally been solved, the method for testing of its withstand voltage properties and evaluation means problem.
The present invention is achieved by the following technical solutions:
Be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: include detection receptacle and to be measured, described to be measured is lifted in the detection receptacle; Be respectively equipped with perforate on the front and rear end of described detection receptacle, on the side of detection receptacle insulated receptacle be installed; Described to be measured includes metal tube, metal tube is wound with insulation course to be measured outward, described metal tube two ends fixedly are communicated with the extension of outer end sealing respectively, add insulator on the described extension respectively, increase respectively on described extension and the insulator to be wound with insulation course formation extension; Draw the described extension tapping from the detection receptacle front and rear end respectively; Be furnished with temperature sensor on the described insulation course to be measured and be enclosed with aluminium foil formation earthing pole, the slotted line of described temperature sensor and aluminium foil earthing pole are drawn from insulated receptacle.
Describedly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: described detection receptacle is equipped with outward bleeds and gas charging system.
Describedly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: be communicated with liquid coolant on the described insulator respectively into and out of pipe, described liquid coolant is outside Guan Jun picks out detection receptacle; Described liquid coolant inlet pipe is communicated to the liquid outlet on the liquid coolant storage tank.
Describedly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: include high-voltage generating device, described to be measured one end extension is provided with the high voltage feed side, and described high voltage feed side is connected with high-voltage generating device.
Describedly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: include computer acquisition system, the slotted line of described temperature sensor and aluminium foil earthing pole are drawn the back from insulated receptacle and are inserted computer acquisition system.
Describedly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: described liquid coolant is wound with the multilayer insulation thermosphere respectively on pipe.
Describedly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: described liquid coolant is stainless-steel tube into and out of pipe.
Describedly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: adopt the stainless steel and the two flange seal structures of epoxy of motive seal form on described extension and the detection receptacle between the perforate, adopt wedge-like engagement between described steel flange and the epoxy flange and use the O RunddichtringO to realize motive seal.
The present invention is made up of the two large divisions: the one, and to be measured preparation and assembling; The 2nd, test macro and auxiliary equipment.
In large-scale superconducting magnet system, superconduction feeder line, feeder head or current feed as to be measured, its surface structure mostly is pipe shape or similar structures form, their solid insulating layer twines and finally is solidificated on the metallic support, and to be measured end left certain-length transition linkage section and prepared against Insulation test connection and the assembling use of test back after the preparation of finishing insulation course.
In order to finish the test of low temperature Paschen condition, before the test container of packing into, need finish the connection of cooling circuit and being tightly connected of high voltage feed-in for to be measured, weld extension and install insulator additional to be measured end for this reason, the stainless pipe that extension is selected for use and to be measured is gone up the metal tube same size.The single-ended sealing of described stainless pipe, the other end and to be measured Seal welds for ends one, insulator and described stainless pipe weld together in advance, the dielectric strength of insulator should be greater than 1 to 2 times of the dielectric strength of to be measured insulating body, the introducing of insulator can guarantee the electric insulation between coolant cooling circuit and to be measured, makes cooling line remain low-potential state.Described extension and insulator intermediate location are solidified and are increased around insulation course, and insulation course covers whole extension and insulator, and according to the dielectric strength of to be measured insulation course, the dielectric strength that increases around insulation course needs greater than 1 to 2 times.
Extend after connection processing finishes to be measured end, and it is lifted among the test container, and at the surface arrangement temperature sensor of to be measured insulation course to be measured, the temperature sensor type is decided according to be measured cooling situation; Use aluminium foil to wrap up whole surface of insulating layer to be measured and form earthing pole, the insulated receptacle that finishing temperature sensor measurement line and aluminium foil earthing pole are installed from the test container side flange is drawn the back and is inserted computer acquisition system.The two insulators vacuum of welded stainless steel pipe by the test container top respectively cut off to draw and connect the external refrigeration liquid storage tank, as liquid coolant into and out of branch road.At last in to be measured and liquid coolant turnover pipe external packets around the multilayer insulation thermosphere, the thermal load when reducing external environment and lowering the temperature for system.
The sealed at both ends flange of detection receptacle is stretched out in the end, extension, to be measured installation and debugging for convenience, and satisfy the demand of batch testing, the stainless steel and the two flange seal structures of epoxy of motive seal form are adopted in the extension, the epoxy flange guarantees vacuum seal and the electric insulation requirement between test specimen to be measured extension and the test container, adopt wedge-like engagement to use the O RunddichtringO to realize motive seal between steel flange and the epoxy flange, guarantee the vacuum seal between to be measured and the flange arrangement, the vacuum leak phenomenon do not occurred.After the hermetically-sealed construction at both ends is in place, to be measured promptly finished and test container between general assembly.
Attached proving installation in the test container periphery has following several:
(1) vacuum-pumping system, and test gas charges into and barometric control unit, the molecular pump unit can be taken a sample test examination container vacuum to 10
-4About Pa, charge into gas to be measured by charging valve in the time of test, general test gas is nitrogen and helium, and the air pressure of test gas can be regulated by miniature needle point variable valve, changes continuously from 0.1Pa to 1000Pa; (2) low temperature feed system provides and compels the stream cooling for to be measured, can use liquid nitrogen storage tank directly to cool off to be measured when test for the 80K warm area and get final product; (3) high voltage takes place and feedthrough system, choosing of high-voltage generating device is relevant with to be measured target measurement voltage, existing equipment can be realized maximum 100kV for the insulating part of large-scale superconducting magnet, 30 minutes direct current steady state tests, high voltage be feed-in test container inside on to be measured the end metallic supports directly; (4) computer acquisition system mainly carries out the collection and the storage of temperature, voltage, leakage current and gas pressure data.
Before using the present invention to survey examination enforcement, going up insulation course to be measured for to be measured solidifies and finishes and leave the corresponding interface, its end welding extension, and solidify and increase around insulation course makes to be measured high-voltage part be insulated layer fully and covers and only leave to be measured high voltage feed side.To be measured that is ready to complete is subsequently lifted within the test container, two ends insulator outlet connects liquid coolant inlet pipe and liquid coolant inlet pipe, thermometer is docile is installed in to be measured surface of insulating layer to be measured, the thermometer measure line is drawn test container and is connected into computer acquisition system through temperature sensor measurement line insulated receptacle, and surface of insulating layer holds the outlet of aluminium foil earthing pole process earthing pole and draws back access study plot.Extension, to be measured end uses the two flange seal structures in end to realize sealing after stretching out measuring vessel.To be measured, extension, to be measured end and liquid coolant turnover pipe divide at internal tank need add bag multilayer heat insulation layer.
When using the invention process test, use is bled and gas charging system vacuumizes and charge into the air pressure conditions that test gas is realized the Paschen test to testing container, uses the liquid coolant storage tank that to be measured is lowered the temperature and realizes the cryogenic conditions that Paschen tests.High-voltage generating device applies test voltage by all to be measured of high voltage feed side.
System can realize multiple test subject, comprising: (1) traditional insulating material proof voltage test; (2) normal temperature Paschen condition insulation proof voltage test; (3) low temperature Paschen condition insulation proof voltage test; (4) to be measured temperature cycling test; (5) to be measured mechanical fatigue loop test.To satisfy the electrical performance testing demand of large-scale superconducting magnet system high-voltage part insulation substantially.
The present invention can be to using and large-scale superconducting magnet system and other high energy electricity physical field, and the solid insulation that the Paschen condition may appear in vacuum environment work carries out the direct current proof voltage test of realistic operating mode.
The present invention has guaranteed to be measured is carried out under subcooled situation for to be measured end portion treatment mode, and high voltage can cool to be measured in safe feed-in.
Two flange seal modes of extension, to be measured end and test container among the present invention, it is guaranteeing to make things convenient for installation can realize to be measured batch testing under the situation that to be measured vacuum keeps not revealing.
The present invention can carry out low-temperature test for to be measured, and the test environment of multiple gases and air pressure is provided.
Description of drawings
The Paschen electric discharge phenomena take place for defective appears in insulation course in Fig. 1 in the 100Pa helium environment.
Fig. 2 is a structural representation of the present invention.
Embodiment
Participate in accompanying drawing.
Be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, include detection receptacle 7 and to be measured 1, described to be measured 1 is lifted in the detection receptacle 7; Be respectively equipped with perforate on the front and rear end of described detection receptacle 7, insulated receptacle 14 is installed on the side of detection receptacle 7; Described to be measured 1 includes metal tube, metal tube is wound with insulation course to be measured outward, described metal tube two ends fixedly are communicated with the extension of outer end sealing respectively, add insulator 15 on the described extension respectively, increase respectively on described extension and the insulator 15 to be wound with insulation course formation extension 6; Draw described extension 6 tapping from detection receptacle 7 front and rear ends respectively; Be furnished with temperature sensor on the described insulation course to be measured and be enclosed with aluminium foil formation earthing pole, the slotted line 12 and the aluminium foil earthing pole of described temperature sensor are drawn from insulated receptacle 14.Detection receptacle 7 outer being equipped with are bled and gas charging system 8.Be communicated with liquid coolant on the insulator 15 respectively into and out of pipe 3,2, described liquid coolant all picks out outside the detection receptacle 7 into and out of pipe 3,2; Described liquid coolant inlet pipe 3 is communicated to the liquid outlet on the liquid coolant storage tank 5.Include computer acquisition system 9, the slotted line 12 of described temperature sensor and aluminium foil earthing pole are drawn the back from insulated receptacle 14 and are inserted computer acquisition system 9.
Include high-voltage generating device 10, described to be measured 1 one end extension 6 is provided with high voltage and sends out feed side 11, and described high voltage is sent out feed side 11 and is connected with high-voltage generating device 10.
Before test implementation, insulation course to be measured solidifies and finishes and leave the corresponding interface on to be measured 1, and its end welding extension, and solidify and increase around insulation course, the high-voltage part that makes to be measured 1 are insulated layer fully and cover and only leave to be measured 1 high voltage and send out feed side 11.To be measured 1 that is ready to complete is subsequently lifted within the test container, insulator 15 outlets in two ends connect liquid coolant inlet pipe 3 and liquid coolant inlet pipe 3, thermometer is docile is installed in to be measured 1 surface of insulating layer to be measured, thermometer measure line 12 is drawn test container and is connected into computer acquisition system 9 through insulated receptacle 14, and surface of insulating layer holds the aluminium foil earthing pole and draws back access study plot through earthing pole outlet 13.Extension, to be measured 1 end 6 uses the two flange seal structures 4 in end to realize sealing after stretching out measuring vessel.To be measured 1, extension 6, to be measured 1 end and liquid coolant turnover pipe divide at internal tank need add bag multilayer heat insulation layer.
When implementing test, use is bled and 8 pairs of testing containers of gas charging system vacuumize and charge into the air pressure conditions that test gas is realized the Paschen test, uses the liquid coolant storage tank to lower the temperature for 5 pairs to be measured 1 and realizes the cryogenic conditions that Paschen tests.High-voltage generating device 10 is sent out all to be measured 1 of feed side 11 by high voltage and is applied test voltage.
Claims (8)
1. be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: include detection receptacle and to be measured, described to be measured is lifted in the detection receptacle; Be respectively equipped with perforate on the front and rear end of described detection receptacle, on the side of detection receptacle insulated receptacle be installed; Described to be measured includes metal tube, metal tube is wound with insulation course to be measured outward, described metal tube two ends fixedly are communicated with the extension of outer end sealing respectively, add insulator on the described extension respectively, increase respectively on described extension and the insulator to be wound with insulation course formation extension; Draw the described extension tapping from the detection receptacle front and rear end respectively; Be furnished with temperature sensor on the described insulation course to be measured and be enclosed with aluminium foil formation earthing pole, the slotted line of described temperature sensor and aluminium foil earthing pole are drawn from insulated receptacle.
2. according to claim 1ly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: described detection receptacle is equipped with outward bleeds and gas charging system.
3. according to claim 1ly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: be communicated with liquid coolant on the described insulator respectively into and out of pipe, described liquid coolant is outside Guan Jun picks out detection receptacle; Described liquid coolant inlet pipe is communicated to the liquid outlet on the liquid coolant storage tank.
4. according to claim 1ly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: include high-voltage generating device, described to be measured one end extension is provided with the high voltage feed side, and described high voltage feed side is connected with high-voltage generating device.
5. according to claim 1ly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: include computer acquisition system, the slotted line of described temperature sensor and aluminium foil earthing pole are drawn the back from insulated receptacle and are inserted computer acquisition system.
6. according to claim 3ly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: described liquid coolant is wound with the multilayer insulation thermosphere respectively on pipe.
7. according to claim 3ly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: described liquid coolant is stainless-steel tube into and out of pipe.
8. according to claim 1ly be used for solid insulation withstand voltage properties test macro under the high voltage low temperature Paschen condition, it is characterized in that: adopt the stainless steel and the two flange seal structures of epoxy of motive seal form on described extension and the detection receptacle between the perforate, adopt wedge-like engagement between described steel flange and the epoxy flange and use the O RunddichtringO to realize motive seal.
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| CN 201110113088 CN102253319B (en) | 2011-05-04 | 2011-05-04 | Solid insulation voltage resistance performance test system under high voltage and low temperature Paschen condition |
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| CN 201110113088 CN102253319B (en) | 2011-05-04 | 2011-05-04 | Solid insulation voltage resistance performance test system under high voltage and low temperature Paschen condition |
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| CN102253319A true CN102253319A (en) | 2011-11-23 |
| CN102253319B CN102253319B (en) | 2013-07-03 |
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Cited By (6)
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| CN109655725A (en) * | 2019-01-04 | 2019-04-19 | 合肥聚能电物理高技术开发有限公司 | The quickly device and method of detection solid insulating layer Paschen performance at low pressure |
| CN109738351A (en) * | 2019-02-20 | 2019-05-10 | 扬州大学 | A kind of hollow cladding cable connector experimental rig |
| CN111239564A (en) * | 2020-02-24 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Device and method for testing thermal state gas breakdown characteristics |
| CN111948499A (en) * | 2020-07-17 | 2020-11-17 | 中国科学院合肥物质科学研究院 | Testing device for local Paschen test of superconducting magnet |
| CN112198468A (en) * | 2020-09-11 | 2021-01-08 | 中国科学院金属研究所 | Waveguide method microwave dielectric material ultralow temperature complex electromagnetic parameter testing device |
| CN114062876A (en) * | 2021-11-19 | 2022-02-18 | 中国科学院合肥物质科学研究院 | Test device and test method capable of directly observing Paschen discharge phenomenon of insulating substance |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109655725A (en) * | 2019-01-04 | 2019-04-19 | 合肥聚能电物理高技术开发有限公司 | The quickly device and method of detection solid insulating layer Paschen performance at low pressure |
| CN109738351A (en) * | 2019-02-20 | 2019-05-10 | 扬州大学 | A kind of hollow cladding cable connector experimental rig |
| CN109738351B (en) * | 2019-02-20 | 2021-05-18 | 扬州大学 | Hollow multi-layer cable joint test device |
| CN111239564A (en) * | 2020-02-24 | 2020-06-05 | 云南电网有限责任公司电力科学研究院 | Device and method for testing thermal state gas breakdown characteristics |
| CN111948499A (en) * | 2020-07-17 | 2020-11-17 | 中国科学院合肥物质科学研究院 | Testing device for local Paschen test of superconducting magnet |
| CN112198468A (en) * | 2020-09-11 | 2021-01-08 | 中国科学院金属研究所 | Waveguide method microwave dielectric material ultralow temperature complex electromagnetic parameter testing device |
| CN112198468B (en) * | 2020-09-11 | 2022-01-14 | 中国科学院金属研究所 | Waveguide method microwave dielectric material ultralow temperature complex electromagnetic parameter testing device |
| CN114062876A (en) * | 2021-11-19 | 2022-02-18 | 中国科学院合肥物质科学研究院 | Test device and test method capable of directly observing Paschen discharge phenomenon of insulating substance |
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| CN102253319B (en) | 2013-07-03 |
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