CN106018987A - Space charge testing system and method - Google Patents
Space charge testing system and method Download PDFInfo
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- CN106018987A CN106018987A CN201610631514.6A CN201610631514A CN106018987A CN 106018987 A CN106018987 A CN 106018987A CN 201610631514 A CN201610631514 A CN 201610631514A CN 106018987 A CN106018987 A CN 106018987A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/24—Arrangements for measuring quantities of charge
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Abstract
The invention discloses a space charge testing system and method. The space charge testing system comprises a copper electrode arranged on the upper surface of a testing board, a shielding cover for shielding the copper electrode, a copper conductor, a cable limiting device for fixing a cable sample, a first shielding box installed on the lower surface of the testing board and just opposite to the copper electrode, a first piezoelectric sensor, a first aluminum foil, a first organic glass pressing block, a second shielding box installed on the lower surface of the testing board and just opposite to the cable limiting device, a second piezoelectric sensor, a second aluminum foil, a second organic glass pressing block, and a signal amplifier for receiving electric signals sent by the first piezoelectric sensor and the second piezoelectric sensor, wherein one end of the copper conductor is connected with the copper electrode, and the other end of the copper conductor penetrates through the shielding cover, and the first piezoelectric sensor, the first aluminum foil and the first organic glass pressing block are sequentially installed in the first shielding box from top to bottom, and the second piezoelectric sensor, the second aluminum foil and the second organic glass pressing block are sequentially arranged in the second shielding box from top to bottom. According to the space charge testing system and method, the space charge measuring efficiency is improved.
Description
Technical field
The present invention relates to insulation of electrical installation and electrostrictive polymer performance detection technique field, be specifically related to test system and the method for testing of a kind of space charge.
Background technology
There is substantial amounts of trap in polymer, under the effect of electric field, trap capture carrier forms space charge, the internal electric field of space charge Severe distortion polymer insulation.Same polarity space charge reduces the electric field intensity near electrode, and heteropolarity space charge will increase the electric field intensity in this region, thus affects electric charge injection, the mobility of carrier and the breakdown strength etc. of polymeric material of electrode.Therefore, by the measurement to material space CHARGE DISTRIBUTION, it is possible not only to recognize foundation and the attenuation process of dielectric substance Space-charge, but also dielectric substance electrical breakdown and voltage ageing process can be had deeper understanding, this is for selecting suitable material, improving material electric breakdown strength have great importance under high electric field action.
Along with developing rapidly of microelectric technique and sensor technology, occurring in that various excellent space charge test device and developed rapidly, this be to study the DYNAMIC DISTRIBUTION of space charge and it provides good experiment condition to the conductance property of material and the impact of breakdown strength.Difference according to test philosophy, the measuring method of distribution of space charge can be divided three classes: (1) thermal diffusion method: a thermal pulse is put in tested sample, the electric charge in heat diffusion couple regional area in the sample is utilized to produce disturbance, this disturbance will produce an electroresponse, just can obtain the distributed intelligence of sample Space-charge by measuring this electroresponse；(2) pressure wave method: when ripple passes through sample with the speed of sound wave, making the electric charge in sample create shift perturbation, this shift perturbation produces an electroresponse, by measuring the distribution of space charge that this electroresponse can be obtained by sample；(3) pulse electroacoustic method: the one side of sample is applied a ultra-narrow electric pulse by electrode, make the electric charge in sample by the electrostatic force of a change, and then produce an elastic wave, the amplitude of ripple is proportional with the quantity of electric charge, when this elastic wave passes through sample with the velocity of sound, utilize piezoelectric transducer that the measurement of sound wave be can be obtained by the distribution situation of sample Space-charge.
By contrast, pulse electroacoustic method, as a kind of lossless, that repeatability is strong, high tension loop and the separate measuring method of signal circuit, is the space charge measurement method being most widely used at present.In prior art, space charge based on pulse electroacoustic method test system can only test the distribution of space charge state of unitary class sample, such as, measurement to the distribution of space charge state of cable insulation and sheet metal specimens is respectively adopted different test systems, and the range of test system is limited, testing efficiency is low.
Summary of the invention
The problem being existing space charge based on pulse electroacoustic method test system and can only testing the distribution of space charge state of unitary class sample to be solved by this invention.
The present invention is achieved through the following technical solutions:
The test system of a kind of space charge, including testing stand, Top electrode device, cable stopping means, the first lower electrode device, the second lower electrode device and signal amplifier；Described Top electrode device include being arranged on described testing stand upper surface copper electrode, be connected with described copper electrode for the radome and one end shielding described copper electrode, the other end passes the copper conductor of described radome, is filled with epoxy resin among the cavity that described radome and described testing stand upper surface surround；Described cable stopping means is arranged on described testing stand upper surface, is used for fixing sample of cable；Described first lower electrode device include being arranged on described testing stand lower surface and with described copper electrode just to the first shielding box and be successively set on the first piezoelectric transducer in described first shielding box, the first aluminium foil, the first lucite briquetting from top to bottom；Described second lower electrode device include being arranged on described testing stand lower surface and with described cable stopping means just to secondary shielding box and be successively set on the second piezoelectric transducer in described secondary shielding box, the second aluminium foil, the second lucite briquetting from top to bottom；Described signal amplifier is for receiving described first piezoelectric transducer and the signal of telecommunication of described second piezoelectric transducer transmission.
The space charge test system that technical solution of the present invention provides, by designing single electrode assembly and shared signal amplifier, both the distribution of space charge of sample of cable can have been measured, the distribution of space charge of plane plate specimen can be measured again, make system both may be used for actual cable insulation condition diagnosis, can be used for again the research of material science.Compared with being respectively adopted different test systems with measurement to the distribution of space charge state of cable insulation and sheet metal specimens in prior art, substantially increase measurement efficiency, and reduce the volume of measurement system.
Optionally, described radome is cylindrical shield cover, and the other end of described copper conductor vertically passes the upper surface of described cylindrical shield cover.
Optionally, the side of described cylindrical shield cover is fixed on described testing stand upper surface by flange.Fixed by flange, the described radome of convenient dismounting.
Optionally, described cable stopping means includes being installed in parallel in described testing stand upper surface, for limiting starting stave and second riser of sample of cable horizontal level and being arranged between described starting stave and described second riser, for limiting the T-shaped briquetting of sample of cable upright position.
Optionally, the lower surface of described T-shaped briquetting is provided with the V-groove that Open Side Down.By arranging, at T-shaped briquetting lower surface, the V-groove that Open Side Down, it is adapted to the sample of cable in the most collinear footpath, and increases the contact area of described T-shaped briquetting and sample of cable, be more beneficial for fixing of sample of cable.
Optionally, the bottom land of described V-groove is set to chamfering structure.By the bottom land of V-groove is set to chamfering structure, the contact area of described T-shaped briquetting and sample of cable can be increased further.
Optionally, described cable stopping means includes that at least one is arranged on described testing stand upper surface and the semi arch tight position ring that Open Side Down by the mode of removably connecting.
Optionally, the test system of described space charge also includes the side plate with described testing stand composition closed cavity and base plate, and described signal amplifier is arranged in described closed cavity.
Optionally, the test system of described space charge also includes being arranged on and is arranged on the shielded box on described base plate in described closing body of wall, by fixation clamp, and described signal amplifier is arranged in described shielded box.By arranging described shielded box, the signal being possible to prevent external noise signals to process described signal amplifier produces interference, thus improves the accuracy of test result.
Test system based on above-mentioned space charge, the present invention also provides for the method for testing of a kind of space charge, including space charge and the space charge of test plane plate specimen of test cable sample；
The space charge of test cable sample includes: be fixed on by sample of cable in described cable stopping means；With cable core as positive pole, described second aluminium foil as negative pole, cable insulation parts is given added electric field；Continue to electric field, cable core is applied high-voltage pulse simultaneously, utilize described second piezoelectric transducer receive mechanical wave and mechanical wave is converted into the signal of telecommunication, described signal amplifier export to signal collecting device after the signal of telecommunication being amplified；
The space charge of test plane plate specimen includes: be placed under described copper electrode by plane plate specimen；With described copper conductor as positive pole, described first aluminium foil as negative pole, to plane plate specimen apply electric field；Continue to electric field, described copper conductor is applied high-voltage pulse simultaneously, utilize described first piezoelectric transducer receive mechanical wave and mechanical wave is converted into the signal of telecommunication, described signal amplifier export to signal collecting device after the signal of telecommunication being amplified.
The present invention compared with prior art, has such advantages as and beneficial effect:
The test system of the space charge that the present invention provides and method of testing, by designing single electrode assembly and shared signal amplifier, both the distribution of space charge of sample of cable can have been measured, the distribution of space charge of plane plate specimen can be measured again, substantially increase the measurement efficiency of space charge, reduce the volume of measurement system.
Accompanying drawing explanation
Accompanying drawing described herein is used for providing being further appreciated by the embodiment of the present invention, constitutes the part of the application, is not intended that the restriction to the embodiment of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the test system of the space charge of the embodiment of the present invention；
Fig. 2 is the structural representation of the cable stopping means of another kind embodiment of the present invention；
Fig. 3 is the structural representation of the first lower electrode device of the embodiment of the present invention；
Fig. 4 is the structural representation of the second lower electrode device of the embodiment of the present invention.
The parts title of labelling and correspondence in accompanying drawing:
1-testing stand, 21-copper electrode, 22-radome, 23-copper conductor, 24-epoxy resin, 31-the first shielding box, 32-the first piezoelectric transducer, 33-the first aluminium foil, 34-the first lucite briquetting, 41-secondary shielding box, 42-the second piezoelectric transducer, 43-the second aluminium foil, 44-the second lucite briquetting, 51-starting stave, 52-the second riser, 53-T type briquetting, 61-semi arch tight position ring, 62-fastening bolt, 71-fixation clamp, 72-shielded box, 81-cable core, 82-cable insulation part.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, and the exemplary embodiment of the present invention and explanation thereof are only used for explaining the present invention, not as a limitation of the invention.
Embodiment
Fig. 1 is the structural representation of the test system of the space charge of the embodiment of the present invention, and the test system of described space charge includes testing stand 1, Top electrode device, cable stopping means, the first lower electrode device, the second lower electrode device and signal amplifier.Wherein, described Top electrode device and described first lower electrode device constitute the space charge measurement part of plane plate specimen, described cable stopping means and described second lower electrode device constitute the space charge measurement part of sample of cable, and described signal amplifier is two measurement partial commons.
Specifically, described Top electrode device include being arranged on described testing stand 1 upper surface copper electrode 21, be connected with described copper electrode 21 for the radome 22 and one end shielding described copper electrode 21, the other end passes the copper conductor 23 of described radome 22, is filled with epoxy resin 24 among the cavity that described radome 22 and described testing stand 1 upper surface surround.By filling described epoxy resin 24, it is possible to prevent the sounding shelf depreciation when testing plane plate specimen.In the present embodiment, described copper electrode 21 is cylinder electrode.Described radome 22 is cylindrical shield cover, and the other end of described copper conductor 23 vertically passes the upper surface of described cylindrical shield cover.Further, the side of described cylindrical shield cover is fixed on described testing stand 1 upper surface by flange 25, and described flange 25 is fixed on described testing stand 1 upper surface by fastening bolt.
Described cable stopping means is arranged on described testing stand 1 upper surface, is used for fixing sample of cable.A kind of concrete structure of described cable stopping means is as it is shown in figure 1, include being installed in parallel in described testing stand 1 upper surface, for limiting starting stave 51 and second riser 52 of sample of cable horizontal level and being arranged between described starting stave 51 and described second riser 52, for limiting the T-shaped briquetting 53 of sample of cable upright position.During fixing sample of cable, sample of cable is placed on described starting stave 51 and in square groove that described second riser 52 is formed, the lower surface of described T-shaped briquetting 53 is pressed on sample of cable, re-uses fastening bolt and described T-shaped briquetting 53 is fixed with described starting stave 51 and described second riser 52.It is of course also possible to use other removablies to be connected with described starting stave 51 and described second riser 52 by described T-shaped briquetting 53, this is not construed as limiting by the present embodiment.In the present embodiment, the lower surface of described T-shaped briquetting 53 is provided with the V-groove that Open Side Down, and the bottom land of described V-groove is set to chamfering structure.Being provided by chamfering structure and the V-groove that Open Side Down, described T-shaped briquetting 53 can be made to adapt to the sample of cable in the most collinear footpath, and increase the contact area of described T-shaped briquetting 53 and sample of cable, beneficially sample of cable is fixing.
Fig. 2 is the structural representation of the cable stopping means of another kind embodiment of the present invention, and described cable stopping means includes that at least one is arranged on described testing stand 1 upper surface and the semi arch tight position ring 61 that Open Side Down by the mode of removably connecting.In the present embodiment, described semi arch tight position ring 61 is arranged on described testing stand 1 upper surface by the fastening bolt 62 at two ends.
Fig. 3 is the structural representation of the first lower electrode device of the embodiment of the present invention, described first lower electrode device include being arranged on described testing stand 1 lower surface and with described copper electrode 21 just to the first shielding box 31 and first piezoelectric transducer the 32, first aluminium foil the 33, first lucite briquetting 34 of being successively set on from top to bottom in described first shielding box 31.Described first shielding box 31 can be fixed on described testing stand 1 lower surface by fastening bolt, and pushes against described first lucite briquetting 34.By arranging the thickness of described first lucite briquetting 34, described first lucite briquetting 34 can be made to compress described first piezoelectric transducer 32 and described first aluminium foil 33, make described first piezoelectric transducer 32 be close to described testing stand 1 lower surface.
Fig. 4 is the structural representation of the second lower electrode device of the embodiment of the present invention, described second lower electrode device include being arranged on described testing stand 1 lower surface and with described cable stopping means just to secondary shielding box 41 and second piezoelectric transducer the 42, second aluminium foil the 43, second lucite briquetting 44 of being successively set on from top to bottom in described secondary shielding box 42.The structure of described second lower electrode device is similar with the structure of described first lower electrode device, does not repeats them here.
Described signal amplifier is for receiving described first piezoelectric transducer 32 and the signal of telecommunication of described second piezoelectric transducer 42 transmission.With continued reference to Fig. 1, the test system of the space charge of the present embodiment also includes constituting side plate and the base plate of closed cavity with described testing stand 1, and side plate includes minor face side plate and long side plate (not shown), and described signal amplifier is arranged in described closed cavity.Further, the test system of the space charge of the present embodiment also includes being arranged on the shielded box 72 being arranged on described base plate in described closing body of wall, by fixation clamp 71, and described signal amplifier is arranged in described shielded box 72.By arranging described shielded box 72, the signal being possible to prevent external noise signals to process described signal amplifier produces interference, thus improves the accuracy of test result.In the present embodiment, described fixation clamp 71 is the U-shaped fixation clamp that bottom is right angle, is fixed on described base plate by the fastening bolt at two ends.It should be noted that described testing stand 1, described side plate and described base plate use full aluminium material, there is good shielding action so that measure signal stabilization.
The test system and test sample of cable of the space charge of the employing embodiment of the present invention and the space charge method of plane plate specimen are as follows:
The space charge of test cable sample includes step S11 ~ step S13:
Step S11, is fixed on sample of cable in described cable stopping means.
Step S12, with cable core 81 as positive pole, described second aluminium foil 43 as negative pole, cable insulation part 82 is applied electric field.High-voltage DC power supply can be used to apply top-down electric field so that the defect in cable insulation part 82 and room enrichment space charge.
Step S13, continues to electric field, cable core 81 is applied high-voltage pulse simultaneously, utilizes described second piezoelectric transducer 42 receive mechanical wave and mechanical wave is converted into the signal of telecommunication, described signal amplifier export to signal collecting device after being amplified by the signal of telecommunication.In described cable insulation part 82, the space charge of enrichment can produce downward mechanical stress under the effect of high-voltage pulse, and described second piezoelectric transducer 42 detects this mechanical stress, mechanical wave is converted into the signal of telecommunication.
The space charge of test plane plate specimen includes S21 ~ step S23:
Step S21, is placed on described copper electrode 21 times by plane plate specimen.Specifically, before placing plane plate specimen, described radome 22 is taken off, plane plate specimen is placed on immediately below described copper electrode 21, by described copper electrode 21, plane plate specimen is fastened, more described radome 22 is fixed on described testing stand 1 upper surface.
Step S22, with described copper conductor 23 as positive pole, described first aluminium foil 33 as negative pole, plane plate specimen is applied electric field.High-voltage DC power supply can be used to apply top-down electric field so that the defect in plane plate specimen and room enrichment space charge.
Step S23, continues to electric field, described copper conductor 23 is applied high-voltage pulse simultaneously, utilizes described first piezoelectric transducer 32 receive mechanical wave and mechanical wave is converted into the signal of telecommunication, described signal amplifier export to signal collecting device after being amplified by the signal of telecommunication.In plane plate specimen, the space charge of enrichment can produce downward mechanical stress under the effect of high-voltage pulse, and described first piezoelectric transducer 32 detects this mechanical stress, mechanical wave is converted into the signal of telecommunication.
Above-described detailed description of the invention; the purpose of the present invention, technical scheme and beneficial effect are further described; it is it should be understood that; the foregoing is only the detailed description of the invention of the present invention; the protection domain being not intended to limit the present invention; all within the spirit and principles in the present invention, any modification, equivalent substitution and improvement etc. done, should be included within the scope of the present invention.
Claims (10)
1. the test system of a space charge, it is characterised in that include testing stand (1), Top electrode device, cable stopping means, the first lower electrode device, the second lower electrode device and signal amplifier；
Described Top electrode device includes being arranged on the copper electrode (21) of described testing stand (1) upper surface, the radome (22) being used for shielding described copper electrode (21) and one end is connected with described copper electrode (21), the other end passes the copper conductor (23) of described radome (22), is filled with epoxy resin (24) among the cavity that described radome (22) and described testing stand (1) upper surface surround；
Described cable stopping means is arranged on described testing stand (1) upper surface, is used for fixing sample of cable；
Described first lower electrode device include being arranged on described testing stand (1) lower surface and with described copper electrode (21) just to the first shielding box (31) and be successively set on the first piezoelectric transducer (32) in described first shielding box (31), the first aluminium foil (33), the first lucite briquetting (34) from top to bottom；
Described second lower electrode device include being arranged on described testing stand (1) lower surface and with described cable stopping means just to secondary shielding box (41) and be successively set on the second piezoelectric transducer (42) in described secondary shielding box (41), the second aluminium foil (43), the second lucite briquetting (44) from top to bottom；
The signal of telecommunication that described signal amplifier is used for receiving described first piezoelectric transducer (32) and described second piezoelectric transducer (42) sends.
The test system of space charge the most according to claim 1, it is characterised in that described radome (22) is cylindrical shield cover, the other end of described copper conductor (23) vertically passes the upper surface of described cylindrical shield cover.
The test system of space charge the most according to claim 2, it is characterised in that the side of described cylindrical shield cover is fixed on described testing stand (1) upper surface by flange (25).
The test system of space charge the most according to claim 1, it is characterized in that, described cable stopping means includes being installed in parallel in described testing stand (1) upper surface, for limiting starting stave (51) and second riser (52) of sample of cable horizontal level and being arranged between described starting stave (51) and described second riser (52), for limiting the T-shaped briquetting (53) of sample of cable upright position.
The test system of space charge the most according to claim 4, it is characterised in that the lower surface of described T-shaped briquetting (53) is provided with the V-groove that Open Side Down.
The test system of space charge the most according to claim 5, it is characterised in that the bottom land of described V-groove is set to chamfering structure.
The test system of space charge the most according to claim 1, it is characterised in that described cable stopping means includes that at least one is arranged on described testing stand (1) upper surface and semi arch tight position ring (61) that Open Side Down by the mode of removably connecting.
The test system of space charge the most according to claim 1, it is characterised in that also including the side plate with described testing stand (1) composition closed cavity and base plate, described signal amplifier is arranged in described closed cavity.
The test system of space charge the most according to claim 8, it is characterized in that, also including the shielded box (72) being arranged in described closing body of wall, being arranged on described base plate by fixation clamp (71), described signal amplifier is arranged in described shielded box (72).
10. the method for testing of the space charge of a test system based on the space charge described in any one of claim 1 to 9, it is characterised in that include space charge and the space charge of test plane plate specimen of test cable sample；
The space charge of test cable sample includes:
Sample of cable is fixed in described cable stopping means；
With cable core (81) as positive pole, described second aluminium foil (43) as negative pole, to cable insulation part (82) apply electric field；
Continue to electric field, cable core (81) is applied high-voltage pulse simultaneously, utilize described second piezoelectric transducer (42) receive mechanical wave and mechanical wave is converted into the signal of telecommunication, described signal amplifier export to signal collecting device after the signal of telecommunication being amplified；
The space charge of test plane plate specimen includes:
Plane plate specimen is placed under described copper electrode (21)；
With described copper conductor (23) as positive pole, described first aluminium foil (33) as negative pole, to plane plate specimen apply electric field；
Continue to electric field, described copper conductor (23) is applied high-voltage pulse simultaneously, utilize described first piezoelectric transducer (32) receive mechanical wave and mechanical wave is converted into the signal of telecommunication, described signal amplifier export to signal collecting device after the signal of telecommunication being amplified.
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| CN201610631514.6A CN106018987A (en) | 2016-08-04 | 2016-08-04 | Space charge testing system and method |
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| CN108089068A (en) * | 2017-12-08 | 2018-05-29 | 西安交通大学 | Compound slab sample three dimensions charge detecting device based on pulse electroacoustic method |
| CN108181517A (en) * | 2017-12-28 | 2018-06-19 | 全球能源互联网研究院有限公司 | A kind of device and method for being used to detect high-voltage cable joint Space-charge |
| CN110244138A (en) * | 2019-05-29 | 2019-09-17 | 同济大学 | The two-sided in-situ measurement system and method for distribution of charges in a kind of thin dielectric film |
| CN110907839A (en) * | 2019-11-21 | 2020-03-24 | 宁德新能源科技有限公司 | Battery testing system and battery testing method |
| CN111505399A (en) * | 2020-04-28 | 2020-08-07 | 同济大学 | Method for measuring space charge distribution of polymer dielectric film |
| CN111562448A (en) * | 2020-05-15 | 2020-08-21 | 中国南方电网有限责任公司电网技术研究中心 | High-voltage direct-current cable insulating layer charge injection quantity characterization method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108089068A (en) * | 2017-12-08 | 2018-05-29 | 西安交通大学 | Compound slab sample three dimensions charge detecting device based on pulse electroacoustic method |
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| CN110907839A (en) * | 2019-11-21 | 2020-03-24 | 宁德新能源科技有限公司 | Battery testing system and battery testing method |
| CN111505399A (en) * | 2020-04-28 | 2020-08-07 | 同济大学 | Method for measuring space charge distribution of polymer dielectric film |
| CN111505399B (en) * | 2020-04-28 | 2021-11-09 | 同济大学 | Method for measuring space charge distribution of polymer dielectric film |
| CN111562448A (en) * | 2020-05-15 | 2020-08-21 | 中国南方电网有限责任公司电网技术研究中心 | High-voltage direct-current cable insulating layer charge injection quantity characterization method |
| CN111562448B (en) * | 2020-05-15 | 2023-02-28 | 南方电网科学研究院有限责任公司 | High-voltage direct-current cable insulating layer charge injection amount characterization method |
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