CN105388405A - Test apparatus and method for insulation characteristic of mixed gas - Google Patents
Test apparatus and method for insulation characteristic of mixed gas Download PDFInfo
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- CN105388405A CN105388405A CN201510993163.9A CN201510993163A CN105388405A CN 105388405 A CN105388405 A CN 105388405A CN 201510993163 A CN201510993163 A CN 201510993163A CN 105388405 A CN105388405 A CN 105388405A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1281—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of liquids or gases
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Abstract
The invention relates to a test apparatus for the insulation characteristic of mixed gas. The test apparatus comprises a seal box, an electrode pair disposed in the center in the seal box, and a temperature control system for adjusting the temperature inside the seal box. The seal box is equipped with gas charge openings for gas to be tested. The seal box is provided with an air gauge. The invention also provides a test method for the insulation characteristic of mixed gas, which applies the above test apparatus. The test apparatus and method are used for test the insulation characteristic of mixed gas in high/low temperature and high/low pressure conditions. Therefore, the optimal ratio of mixed gas and the optimal matching pressure of gas insulated equipment in different temperature ranges are obtained quickly and conveniently, and a GIS gas insulation design scheme in cold areas with high altitude is optimized.
Description
Technical field
The present invention relates to power transmission and transforming equipment gas-insulated experimental technique field, refer in particular to a kind of Mixed gas insulation characteristic test apparatus and test method.
Background technology
Sulfur hexafluoride gas is the insulating gas uniquely obtaining industrial application up to now, and the operational effect of sulfur hexafluoride gas-insulating electrical equipment has obtained generally to be approved.Because sulfur hexafluoride gas is the heavy gas that molecular weight is larger, the more general common gases of condensing temperature is high, and, temperature comparatively large at pressure comparatively easily liquefies, under extreme weather conditions under low condition, the operating pressure of sulfur hexafluoride gas is restricted, thus have impact on its dielectric level.Therefore, single sulfur hexafluoride gas is not suitable for extremely frigid zones, and single sulfur hexafluoride gas liquefaction phenomenon can occur under operating pressure, and its insulating property cannot be met the demands.On short terms, result of the above problems in sulfur hexafluoride, adds the common gases such as nitrogen, carbon dioxide or air form binary or Diversity gas.But, the domestic and international research about sulfur hexafluoride gas mixture is at present carried out under mainly concentrating on normal temperature condition, in addition, sulfur hexafluoride gas has very high greenhouse effect index, also limit a large amount of uses in its future, thus need to study sulfur hexafluoride in different temperatures interval mix and substitute the insulating property of gas, the optimum mixed gas proportioning of acquisition and matching pressure are the necessary conditions of current extremely frigid zones air insulating device reliability service.
Summary of the invention
The object of the invention is to propose a kind of Mixed gas insulation characteristic test apparatus, for to mixed gas high/low temperature and height atmospheric pressure state under dielectric test, to obtain the mixed gas proportioning of different temperatures interval air insulating device optimum and matching pressure quickly and easily, optimize extremely frigid zones GIS gas-insulated design proposal.
The present invention also provides a kind of test method being applied to above-mentioned Mixed gas insulation characteristic test apparatus, to obtain the mixed gas proportioning of different temperatures interval air insulating device optimum and matching pressure quickly and easily.
In order to achieve the above object, the technical solution used in the present invention is as follows: a kind of Mixed gas insulation characteristic test apparatus, it is characterized in that, comprise seal box, be arranged at the electrode pair of medium position in seal box, and regulating the temperature control system of sealing the temperature inside the box, described seal box is provided with the inflation inlet of gas to be measured, and described seal box is provided with rain glass.
According to above scheme, described temperature control system comprises well heater, refrigerator, temperature controller and temperature sensor, described well heater is positioned at the bottom of seal box, described refrigerator is positioned at the top of seal box, described temperature sensor is for the temperature signal that detects in seal box and send to temperature controller, and described temperature controller controls the duty of described well heater and refrigerator to regulate the real time temperature in seal box according to the temperature signal that temperature sensor detects.
According to above scheme, described inflation inlet has more than two.
According to above scheme, described electrode pair comprises the electrode of exerting pressure be installed on by mechanical rotating mechanism on seal box top board, and is installed on the ground-electrode on seal box base plate by mechanical rotating mechanism and height adjustment mechanism; Described electrode and the ground-electrode of exerting pressure includes clavate, spherical and plate shaped three kinds of shapes.
According to above scheme, the side plate of described seal box is provided with gap measuring device, for measuring the spacing between described electrode pair.
The present invention also provides a kind of test method being applied to above-mentioned Mixed gas insulation characteristic test apparatus, comprises the following steps:
In seal box, be filled with the mixed gas of preset blending ratio by described inflation inlet, make seal box internal gas pressure reach predetermined pressure;
The temperature in described seal box is regulated to reach predetermined temperature by temperature control system;
External voltage is applied with rising gradually, until mixed gas is breakdown to electrode pair;
Record the voltage breakdown of temperature in the proportioning of current mixed gas, seal box and correspondence.
According to above scheme, describedly regulate the temperature in described seal box to reach predetermined temperature by temperature control system, comprise particularly:
Predetermined temperature is set by temperature controller;
Detect the Current Temperatures in seal box by temperature sensor, and be sent to temperature controller;
Predetermined temperature and Current Temperatures contrast by temperature controller, if predetermined temperature is greater than Current Temperatures, then control heater heats in seal box; If predetermined temperature is less than Current Temperatures, then controls refrigerator and freeze in seal box; If predetermined temperature equals Current Temperatures, then control heater and refrigerator are all failure to actuate.
According to above scheme, the described mixed gas being filled with preset blending ratio by described inflation inlet in seal box, is comprised particularly:
By inflation inlets more than two on seal box synchronously to the mixed gas being filled with preset blending ratio in seal box;
The real-time air pressure in described seal box is detected by described rain glass;
Continue the mixed gas being filled with preset blending ratio in seal box, until the air pressure in seal box reaches predetermined pressure.
According to above scheme, described electrode pair of giving applies external voltage with rising gradually, comprises particularly:
To be exerted pressure electrode and the predetermined pairing shape of ground-electrode in clavate, spherical or plate shaped middle selection by mechanical rotating mechanism;
Regulated the height of described ground-electrode by height adjustment mechanism, reach preset space length with the spacing changed between described electrode pair;
The external voltage risen gradually is applied to electrode of exerting pressure.
According to above scheme, the described height being regulated described ground-electrode by height adjustment mechanism, is comprised particularly:
By gap measuring device detecting electrode between current spacing;
The height of described ground-electrode is regulated by height adjustment mechanism;
The current spacing between electrode pair is made to equal preset space length.
Test unit of the present invention and test method, Mixed gas insulation attribute testing is carried out in a seal box, the temperature in seal box is regulated by temperature control system, for simulating extreme state of temperature, by to the mixed gas being filled with preset blending ratio in seal box, the air pressure in seal box is changed in conjunction with rain glass and aeration quantity, for simulating actual pressure state, the basis of this test unit proposes the test method of mixed gas insulating property under wide temperature condition, can meet single, binary or multicomponent gas medium are in different temperatures, pressure, multidimensional variable test demand under different current field conditions and different voltage type, the insulating property parameter accurate and effective obtaining mixed gas is convenient and swift, for extremely frigid zones GIS gas-insulated parameter designing.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
In figure: 1, seal box; 11, to exert pressure electrode; 12, ground-electrode; 2, inflation inlet; 3, rain glass; 4, well heater; 5, refrigerator; 6, gap measuring device; 7, mechanical rotating mechanism; 8, height adjustment mechanism.
Embodiment
Below in conjunction with accompanying drawing and embodiment, technical scheme of the present invention is described.
As shown in Figure 1, a kind of Mixed gas insulation characteristic test apparatus of the present invention, comprise seal box 1, be arranged at the electrode pair of medium position in seal box 1, and regulate the temperature control system of temperature in seal box 1, described seal box 1 is provided with the inflation inlet 2 of gas to be measured, and described seal box 1 is provided with rain glass 3.
Particularly, described temperature control system comprises well heater 4, refrigerator 5, temperature controller and temperature sensor, described well heater 4 is positioned at the bottom of seal box 1, described refrigerator 5 is positioned at the top of seal box 1, described temperature sensor is for the temperature signal that detects in seal box 1 and send to temperature controller, and described temperature controller controls the duty of described well heater 4 and refrigerator 5 to regulate the real time temperature in seal box 1 according to the temperature signal that temperature sensor detects.
Preferably, described inflation inlet 2 has more than two.
Particularly, described electrode pair comprises the electrode 11 of exerting pressure be installed on by mechanical rotating mechanism 7 on seal box 1 top board, and is installed on the ground-electrode 12 on seal box 1 base plate by mechanical rotating mechanism 7 and height adjustment mechanism 8; Described electrode 11 and the ground-electrode 12 of exerting pressure includes clavate, spherical and plate shaped three kinds of shapes.
Preferably, the side plate of described seal box 1 is provided with gap measuring device 6, for measuring the spacing between described electrode pair.
The present invention also provides a kind of test method being applied to above-mentioned Mixed gas insulation characteristic test apparatus, comprises the following steps:
In seal box 1, be filled with the mixed gas of preset blending ratio by described inflation inlet 2, make seal box 1 internal gas pressure reach predetermined pressure;
The temperature in described seal box 1 is regulated to reach predetermined temperature by temperature control system;
External voltage is applied with rising gradually, until mixed gas is breakdown to electrode pair;
Record the voltage breakdown of temperature in the proportioning of current mixed gas, seal box 1 and correspondence.
According to above scheme, describedly regulate the temperature in described seal box 1 to reach predetermined temperature by temperature control system, comprise particularly:
Predetermined temperature is set by temperature controller;
Detect the Current Temperatures in seal box 1 by temperature sensor, and be sent to temperature controller;
Predetermined temperature and Current Temperatures contrast by temperature controller, if predetermined temperature is greater than Current Temperatures, then heat in control heater 4 pairs of seal boxs 1; If predetermined temperature is less than Current Temperatures, then control to freeze in refrigerator 5 pairs of seal boxs 1; If predetermined temperature equals Current Temperatures, then control heater 4 and refrigerator 5 are all failure to actuate.
According to above scheme, the described mixed gas being filled with preset blending ratio by described inflation inlet 2 in seal box 1, is comprised particularly:
By inflation inlets 2 more than two on seal box 1 synchronously to the mixed gas being filled with preset blending ratio in seal box 1;
The real-time air pressure in described seal box 1 is detected by described rain glass 3;
Continue the mixed gas being filled with preset blending ratio in seal box 1, until the air pressure in seal box 1 reaches predetermined pressure.
According to above scheme, described electrode pair of giving applies external voltage with rising gradually, comprises particularly:
To be exerted pressure electrode 11 and the predetermined pairing shape of ground-electrode 12 in clavate, spherical or plate shaped middle selection by mechanical rotating mechanism 7;
Regulated the height of described ground-electrode 12 by height adjustment mechanism 8, reach preset space length with the spacing changed between described electrode pair;
To the external voltage that electrode 11 of exerting pressure applies to rise gradually.
According to above scheme, the described height being regulated described ground-electrode 12 by height adjustment mechanism 8, is comprised particularly:
By gap measuring device 6 detecting electrode between current spacing;
The height of described ground-electrode 12 is regulated by height adjustment mechanism 8;
The current spacing between electrode pair is made to equal preset space length.
Test unit of the present invention and test method, Mixed gas insulation attribute testing is carried out in a seal box 1, the temperature in seal box 1 is regulated by temperature control system, for simulating extreme state of temperature, by to the mixed gas being filled with preset blending ratio in seal box 1, the air pressure in seal box 1 is changed in conjunction with rain glass 3 and aeration quantity, for simulating actual pressure state, the basis of this test unit proposes the test method of mixed gas insulating property under wide temperature condition, can meet single, binary or multicomponent gas medium are in different temperatures, pressure, multidimensional variable test demand under different current field conditions and different voltage type, the insulating property parameter accurate and effective obtaining mixed gas is convenient and swift, for extremely frigid zones GIS gas-insulated parameter designing.
Below in conjunction with specific embodiment, test unit of the present invention and test method are described.
As shown in Figure 1, test unit main body comprises seal box 1, seal box 1 offers two inflation inlets 2, can the mixed gas prepared in advance be filled in seal box 1 by inflation inlet 2, on seal box 1, rain glass 3 is housed simultaneously, the air pressure in seal box 1 can be monitored at any time, inflation after making the air pressure in seal box 1 reach the pressure of testing requirements, can be stopped.Charge pressure in seal box 1 is at 0 ~ 0.7MPa, seal box 1 requires that bearing air pressure level is 1.5MPa, possesses explosionproof hole simultaneously, seal box 1 agent structure is made by aluminum alloy materials, inside surface arranges insulating material and covers, double-layered vacuum heat-insulation design and gas encapsulation process, make gas temperature and leakproofness in cavity stablize.
The mounting of roof plate of seal box 1 is exerted pressure electrode 11, electrode 11 of exerting pressure is connected with external high-voltage test electric power by bushing, the base plate of seal box 1 is installed ground-electrode 12, electrode 11 of exerting pressure forms electrode pair with ground-electrode 12, applies voltage carry out flash test to mixed gas.Electrode 11 of exerting pressure comprises clavate, spherical and plate shaped three kinds of variform electrodes, is installed on the top board of seal box 1 by mechanical rotary machinery, and by operating machine, rotating mechanism 7 can select arbitrarily the electrode of a shape to serve as electrode 11 of exerting pressure; Ground-electrode 12 comprises clavate, spherical and plate shaped three kinds of variform electrodes equally, be installed on the base plate of seal box 1 by mechanical rotating mechanism 7 and height adjustment mechanism 8, the electrode of a shape can be selected arbitrarily to serve as ground-electrode 12 by rotating mechanism 7 of operating machine, electrode 11 forms the electrode pair mated with exerting pressure.Mechanical rotating mechanism 7 can adopt rotating disk or common not only rotatable such as ring skeleton and accurate universal joint but also can be positioned the physical construction of a certain angle, three kinds of electrodes of or not shape are installed on and are similar in the structure of rotating disk, electrode can be replaced in 360 degree of rotations, the conversion of electrode shape can be realized, adjacent electrode can not affect the Electric Field Distribution at test electrode edge simultaneously, this is routine techniques, does not describe at this.In the electrode of three kinds of shapes, comprise rod type electrodes tip curvature radius is 2.5mm, spheric electrode diameter is 50mm, and plate-shaped electrode diameter 100mm, does not produce edge effect, electrode surface roughness is 3.2, electrode adopts the good brass of electric conductivity to be that material makes metal electrode, is combined, analogous pole non-uniform electric field, slightly uniform electric field and uniform electric field three kinds of situations by three kinds of difform electrodes, according to the requirement of electric field unevenness, adjustable electrode gap distance touches the mark.Meanwhile, seal box 1 offers installation hand hole, operator can be allowed to be extend in installation hand hole in seal box 1 by hand, mechanical rotating mechanism 7 is operated, to install the electrode pair of predetermined pairing shape.Height adjustment mechanism 8 can adopt the conventional schemes such as motor-driven thread matching structure, and the height being grounded electrode 12 regulates, and change with the spacing realizing electrode pair, spacing adjustable extent is 0-50mm.Further, seal box 1 is also provided with gap measuring device 6, for potential electrode between current spacing, so that the spacing of operator to electrode pair precisely regulates, gap measuring device 6 can be the existing apparatus such as laser ranging instrument, such as on seal box 1, two pairs of laser range finders are installed in the both sides of opposition, are positioned at the centre of electrode pair simultaneously, the spacing that potential electrode is right diligently.Preferably, seal box 1 is also provided with view window, with handled easily person, the shape of electrode pair or spacing is regulated.
Temperature control system in seal box 1, comprise temperature controller, temperature sensor, well heater 4 and refrigerator 5 particularly, well heater 4 is installed on the bottom of seal box 1 for the temperature in heater riser seal box 1, refrigerator 5 is installed on the temperature of top for freezing in reduction seal box 1 of seal box 1, temperature sensor is for detecting the Current Temperatures in sealing, the Current Temperatures information that temperature controller can detect according to design temperature and temperature sensor carrys out the working condition of control heater 4 and refrigerator 5, carries out control accurate to the temperature in seal box 1.For refrigerator 5, comprise the refrigerating evaporator be located in seal box 1 particularly, and the supporting refrigerated medium be located in seal box 1 is standby.Temperature control system can regulate the temperature in seal box 1 to change in-60 DEG C ~ 120 DEG C continuously, and can ensure that accuracy of temperature control is ± 1 DEG C, and in 1 hour, experimental enviroment can arrive testing requirements temperature by normal temperature.
In addition, test unit can also comprise supporting mixed gas matching system and gas recovery system, is respectively used to carry out proportioning mixing by pre-provisioning request to test gas, and recycles the gas after test.
Each component calls of test unit is at power-frequency voltage 220kV, and lightning impulse voltage 300kV is working properly, insulation is good, and under executing power-frequency voltage 220kV outside ensureing, pilot system is not discharged except regulation and control electrode group.
When testing, first the proportioning of electrode pair is carried out, choose by the shape of test request by electrode pair, by mechanical rotating mechanism 7, exert pressure electrode 11 and the ground-electrode 12 of the reservation shape of selection are rotated to testing position, to form the electrode pair of coupling; Then matched by height adjustment mechanism 8 and gap measuring device 6, the spacing between electrode pair is adjusted to predetermined testing requirements.Mixed gas matching system is inflated by inflation inlet 2 in seal box 1, pays close attention to rain glass 3 at any time to understand the air pressure in seal box 1.Operation temperature control system regulates gas temperature in seal box 1, reach temperature required after make temperature control system keep equalized temperature, stop inflation by predetermined pressure simultaneously.Finally external high pressure power supply is connected to electrode 11 of exerting pressure, carry out Mixed gas insulation attribute testing, and record test parameters.
Process of the test adopts halo-free test AC power (50kVA/250kV) to provide test required power frequency high voltage, and standard capacitor divider provides power frequency measuring-signal, and intrinsic standoff ratio is 1000:1, for power-frequency voltage flashover test and partial discharge test.Surge voltage source (± 300kV/30kJ) provides all-wave lightning impulse voltage needed for test and operating impulse voltage, and adopt underdamping capacitive divider to measure High Voltage Impulse Waveform signal, intrinsic standoff ratio is 1500:1, for surge voltage flash test.
By simulation analysis, for comparing the degree of uniformity of electrode structure size electric field, when electrode gap is defined as d, introduce electric field nonuniformity coefficient f, its value is that between electrode, maximum field is Emax and average field-strength is the ratio of Eav.When f=1 ~ 1.05 are uniform electric field, 1.05<f<2 is slightly uneven electric field, and f>4 belongs to non-uniform electric field, by regulating insulation system clearance distance adjustment electric field degree of irregularity.
Be four variable parameters with mixed gases matching, gas temperature, gaseous tension, electrode model in test, under the condition that ratio of gas mixture, gaseous tension are certain, realize test product continuous controllable adjustment in-60 DEG C ~ 120 DEG C by the test unit that aforementioned temperature, electrode gap and electrode are adjustable, carry out mixed gas flash test at each temperature point respectively.
Particularly, mixed gas adopts sulfur hexafluoride and nitrogen (or carbon tetrafluoride) to mix, and ratio is respectively 1:9,2:8,3:7,4:6,5:5 (mixed gas proportioning can divide according to 5% increment that goes forward one by one); Mixed gas charge pressure chooses mode, according to 0.7MPa, 0.6MPa, 0.5MPa, 0.4MPa, 0.3MPa, 0.2MPa, 0.1MPa; The wide temperature of mixed gas chooses mode, according to-60 DEG C, and-50 DEG C ,-40 DEG C ,-35 DEG C ,-30 DEG C ,-25 DEG C ,-20 DEG C ,-15 DEG C ,-10 DEG C ,-5 DEG C, 0 DEG C, 10 DEG C, 20 DEG C, 50 DEG C, 80 DEG C, 100 DEG C; Change electrode system, regulate electrode gap distance, and seal box 1 is sealed.At normal temperatures, gas after sulfur hexafluoride mixing match is left standstill 4h, after vacuumizing in seal box 1, be filled with test mixed gas in seal box 1, charge pressure is 0.7MPa, and bushing connects high-voltage power supply, ground-electrode 12 connects ground wire, by external high pressure and connect, guarantee test loop connect accurate after, take off ground wire; Operation temperature control system, adjust the temperature to gas liquefaction critical value, recording this temperature is T1, and record pressure P1, regulates temperature T2=T1+5 DEG C, and record pressure P2, regulates temperature to test according to above-mentioned mode of progressively going forward one by one; Under the mixed gas condition of various proportioning, measure the disruptive strength under different air pressure, and record breakdown voltage value, comprise power frequency and puncture and impulse breakdown, impulse breakdown and power frequency flash test hocket.
Power-frequency voltage flashover numerical value is taken to the mean value of few three voltage breakdowns, every puncture for twice between at regular intervals, to eliminate the impact puncturing last time and this is punctured to numerical value, be recorded in table 1.Impact flashover voltage numerical value is obtained by 50% buck/boost method.For each pressure point, obtain its impact flashover voltage value, discharge time is at least 20 times, and dispersiveness can reach more than 40 times more greatly, is recorded in table 2.
The integrated apparatus for Mixed gas insulation attribute testing is regulated and controled as required by adjustable controlled, the electric field unevenness of temperature and pressure provided by the invention, and on the basis of this device, propose the test method of mixed gas insulating property under wide temperature condition, single, binary or the multidimensional variable test demand of multicomponent gas medium under different temperatures, pressure, different current field condition and different voltage type can be met, for extremely frigid zones GIS gas-insulated parameter designing.
The above is only better embodiment of the present invention, therefore all equivalences done according to structure, feature and the principle described in patent claim of the present invention change or modify, and are included in patent claim of the present invention.
Claims (10)
1. a Mixed gas insulation characteristic test apparatus, is characterized in that, comprises seal box, be arranged at the electrode pair of medium position in seal box, and regulating the temperature control system of sealing the temperature inside the box, described seal box is provided with the inflation inlet of gas to be measured, and described seal box is provided with rain glass.
2. Mixed gas insulation characteristic test apparatus according to claim 1, it is characterized in that, described temperature control system comprises well heater, refrigerator, temperature controller and temperature sensor, described well heater is positioned at the bottom of seal box, described refrigerator is positioned at the top of seal box, described temperature sensor is for the temperature signal that detects in seal box and send to temperature controller, and described temperature controller controls the duty of described well heater and refrigerator to regulate the real time temperature in seal box according to the temperature signal that temperature sensor detects.
3. Mixed gas insulation characteristic test apparatus according to claim 1, is characterized in that, described inflation inlet has more than two.
4. Mixed gas insulation characteristic test apparatus according to claim 1, it is characterized in that, described electrode pair comprises the electrode of exerting pressure be installed on by mechanical rotating mechanism on seal box top board, and is installed on the ground-electrode on seal box base plate by mechanical rotating mechanism and height adjustment mechanism; Described electrode and the ground-electrode of exerting pressure includes clavate, spherical and plate shaped three kinds of shapes.
5. Mixed gas insulation characteristic test apparatus according to claim 4, is characterized in that, the side plate of described seal box is provided with gap measuring device, for measuring the spacing between described electrode pair.
6. be applied to a test method for the Mixed gas insulation characteristic test apparatus described in any one of Claims 1 to 5, comprise the following steps:
In seal box, be filled with the mixed gas of preset blending ratio by described inflation inlet, make seal box internal gas pressure reach predetermined pressure;
The temperature in described seal box is regulated to reach predetermined temperature by temperature control system;
External voltage is applied with rising gradually, until mixed gas is breakdown to electrode pair;
Record the voltage breakdown of temperature in the proportioning of current mixed gas, seal box and correspondence.
7. Mixed gas insulation characteristic test method according to claim 6, is characterized in that, describedly regulates the temperature in described seal box to reach predetermined temperature by temperature control system, comprises particularly:
Predetermined temperature is set by temperature controller;
Detect the Current Temperatures in seal box by temperature sensor, and be sent to temperature controller;
Predetermined temperature and Current Temperatures contrast by temperature controller, if predetermined temperature is greater than Current Temperatures, then control heater heats in seal box; If predetermined temperature is less than Current Temperatures, then controls refrigerator and freeze in seal box; If predetermined temperature equals Current Temperatures, then control heater and refrigerator are all failure to actuate.
8. Mixed gas insulation characteristic test method according to claim 6, is characterized in that, the described mixed gas being filled with preset blending ratio by described inflation inlet in seal box, is comprised particularly:
By inflation inlets more than two on seal box synchronously to the mixed gas being filled with preset blending ratio in seal box;
The real-time air pressure in described seal box is detected by described rain glass;
Continue the mixed gas being filled with preset blending ratio in seal box, until the air pressure in seal box reaches predetermined pressure.
9. Mixed gas insulation characteristic test method according to claim 6, is characterized in that, described electrode pair of giving applies external voltage with rising gradually, comprises particularly:
To be exerted pressure electrode and the predetermined pairing shape of ground-electrode in clavate, spherical or plate shaped middle selection by mechanical rotating mechanism;
Regulated the height of described ground-electrode by height adjustment mechanism, reach preset space length with the spacing changed between described electrode pair;
The external voltage risen gradually is applied to electrode of exerting pressure.
10. Mixed gas insulation characteristic test method according to claim 9, is characterized in that, the described height being regulated described ground-electrode by height adjustment mechanism, is comprised particularly:
By gap measuring device detecting electrode between current spacing;
The height of described ground-electrode is regulated by height adjustment mechanism;
The current spacing between electrode pair is made to equal preset space length.
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| CN111856219B (en) * | 2020-06-09 | 2023-06-27 | 华北电力大学 | Creeping discharge test device used in insulating gas under impulse voltage |
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