CN103149515B - A kind of for the space charge measurement device in dielectric long-term ageing process - Google Patents
A kind of for the space charge measurement device in dielectric long-term ageing process Download PDFInfo
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- CN103149515B CN103149515B CN201310068593.0A CN201310068593A CN103149515B CN 103149515 B CN103149515 B CN 103149515B CN 201310068593 A CN201310068593 A CN 201310068593A CN 103149515 B CN103149515 B CN 103149515B
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Abstract
The present invention relates to a kind of for the space charge measurement device in dielectric long-term ageing process, belong to solid dielectric space charge distribution measurement techniques field.Comprise support, rotating disk, publicly electrode, high-voltage DC power supply and multiple space charge measurement mechanism, also comprise impulse source, amplifier, oscillograph and computing machine; Wherein, multiple space charge measurement mechanism is uniform along described disk peripheral; high-voltage DC power supply is connected with the high voltage direct current protective resistance of multiple space charge measurement mechanisms mesohigh electrode; high-voltage output electrode and electroacoustic place sample to be tested in electrode centre pulsedly; the high-voltage output end of impulse source is connected with oscillograph with high-field electrode respectively with low-voltage output; amplifier is connected with oscillograph with sensor, and computing machine is connected with oscillograph by signal wire.This measurement mechanism has increased substantially test efficiency, and has saved a large amount of experimentation cost.
Description
Technical field
The present invention relates to a kind of for the space charge measurement device in dielectric long-term ageing process, particularly relate to a kind of for pulse electroacoustic method (hereinafter referred to as PEA) the space charge measurement device in solid dielectric long-term ageing process, for studying the development law of ageing process Space-charge, belong to solid dielectric space charge distribution measurement techniques field.
Background technology
The impact that insulating material is subject to various aging action in During Process of Long-term Operation occurs aging gradually, causes its electric and decreasing insulating, affects reliability and the life-span of insulating material.It is the key factor affecting equipment life that long-term behaviour as paper oil insulation material space charge under DC electric field develops, and compared with alternating current equipment, lacks very much the research for DC equipment insulation ag(e)ing rule.Thus carry out the deep research of system to the space charge characteristic in solid dielectric long-term ageing process, significant to guarantee power network safety operation, theoretic breakthrough simultaneously is also the Problems of Scientific Research with Important Academic value.
But the measurement of long-term ageing process Space-charge is comparatively difficult, on the one hand because dielectric aging test required time is longer, on the other hand because the space charge characteristic in ageing process has obvious statistical nature, test figure dispersiveness is comparatively large, usually needs under same test conditions, to carry out repeatedly revision test to obtain statistics.In addition PEA space charge measurement device is expensive, makes to be difficult to carry out organizing aging test more simultaneously.The test of current research solid dielectric ageing process Space Charge Properties, mostly be carry out for single sample to be tested, during test, sample to be tested is placed on and carries out aging in aging test platform, takes out sample measurement space charge characteristic to be tested after have passed through predetermined digestion time.This test observation system for single sample to be tested carries out aging test at present, the usual time is longer, and test efficiency is very low, and needs to remove polarizing voltage when measurement space electric charge, interrupt voltage ageing process, be unfavorable for the system further investigation of solid dielectric aging characteristics.
Summary of the invention
The object of the invention is proposition a kind of for the space charge measurement device in dielectric long-term ageing process, for the device measuring dielectric long-term ageing process Space-charge development law, improve the test efficiency that solid dielectric long-term ageing process Space-charge is measured, and reduce testing cost.
The present invention propose for the space charge measurement device in dielectric long-term ageing process, comprise support, rotating disk, publicly electrode, high-voltage DC power supply and multiple space charge measurement mechanism, described electrode is publicly fixed on described support by turntable bearing, described rotating disk is coaxially fixed on the top of electrode publicly, and described multiple space charge measurement mechanisms are uniform along described disk peripheral; By impulse source, electroacoustic, electrode, high-field electrode, sensor, amplifier, oscillograph and computing machine form pulsedly in described space charge measurement mechanism; Described electroacoustic pulsedly electrode is fixed on rotating disk; Described high-field electrode is placed in high-field electrode shell, high-field electrode is made up of capacitance, high voltage direct current protective resistance and high-voltage output electrode, described high-voltage DC power supply is connected with the high voltage direct current protective resistance of multiple space charge measurement mechanisms mesohigh electrode, described high-voltage output electrode and electroacoustic place sample to be tested in electrode centre pulsedly, the high-voltage output end of described impulse source is connected with the capacitance of high-field electrode, and the low-voltage output of impulse source is connected with described oscillograph; The two ends of described amplifier are connected with oscillograph with sensor with signal wire respectively by coaxial socket, and described computing machine is connected with oscillograph by signal wire.
The present invention propose for the space charge measurement device in dielectric long-term ageing process, its advantage is: measurement mechanism of the present invention adopts method that is discrete and continuous phase combination, a set of PEA space charge measurement device is utilized to carry out timing tour inspection to multiple sample to be tested discretely, make it possible to the development law measuring each sample Space-charge to be tested continuously, and do not need to interrupt ageing process.Measurement mechanism of the present invention has increased substantially the test efficiency that solid dielectric long-term ageing process Space-charge is measured when meeting testing requirements.When meeting testing requirements, just can carry out the continuous coverage of the long-term ageing process Space-charge development law of multiple sample to be tested with a set of PEA space charge measurement device simultaneously, overcome prior art Space-charge aging test inefficiency, longer shortcoming consuming time, increase substantially test efficiency, and save a large amount of experimentation cost.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the measurement mechanism that the present invention proposes.
Fig. 2 is the vertical view of measurement mechanism of the present invention.
Fig. 3 is the measure portion enlarged drawing in measurement mechanism of the present invention.
In Fig. 1-Fig. 3,1 is support, and 2 is turntable bearings; 3 is electrodes publicly, and 4 is rotating disks, and 5 is shielding boxs; 6 is sensors, and 7 is electroacoustic electrodes pulsedly, and 8 is high-field electrode shells; 9 is capacitances, 10 high-voltage output electrodes, and 11 is high voltage direct current protective resistances; 12 is fixed screws; 13 is ground joints, and 14 is high-voltage DC power supplies, and 15 is computing machines; 16 is oscillographs; 17 is impulse sources, and 18 is amplifiers, and 19 is connecting lines; 20 is coaxial sockets; 21 is amplifier power supplies, and 22 is screening cans, and 23 is samples to be tested.
Embodiment
The present invention propose for the space charge measurement device in dielectric long-term ageing process, its structure as depicted in figs. 1 and 2, comprise support 1, rotating disk 4, publicly electrode 3, high-voltage DC power supply 14 and multiple space charge measurement mechanism, also comprise impulse source 17, amplifier 18, oscillograph 16 and computing machine 15.Wherein, electrode 3 is fixed on support 1 by turntable bearing 2 publicly, and rotating disk 4 is coaxially fixed on the top of electrode 3 publicly, and multiple space charge measurement mechanism is along rotating disk 4 circumference uniform distribution.By electroacoustic, electrode 7, high-field electrode, sensor 6 form pulsedly in space charge measurement mechanism.Electroacoustic pulsedly electrode 7 is fixed on rotating disk 4.High-field electrode is placed in high-field electrode shell 8; high-field electrode is made up of capacitance 9, high-voltage output electrode 10 and high voltage direct current protective resistance 11; high-voltage DC power supply 14 is connected with the high voltage direct current protective resistance 11 of multiple space charge measurement mechanisms mesohigh electrode, and high-voltage output electrode 10 and electroacoustic place sample to be tested 23 in electrode 7 centre pulsedly.The high-voltage output end of impulse source 17 is connected with the capacitance 9 of the high-field electrode in each space charge measurement mechanism, and the low-voltage output of impulse source 17 is connected with oscillograph 16.The two ends of amplifier 18 are connected with oscillograph 16 with the sensor 6 in each space charge measurement mechanism with signal wire respectively by coaxial socket 20, and computing machine 15 is connected with oscillograph 16 by signal wire.
Below in conjunction with accompanying drawing, introduce principle of work and the course of work of measurement mechanism of the present invention in detail:
The measurement mechanism that the present invention proposes as shown in Figure 1.In the test carrying out the measurement of long-term ageing process Space-charge Changing Pattern; sample to be tested 23 is placed on each electroacoustic pulsedly between electrode 7 and PEA high-field electrode; then package unit is placed in the ageing environment (temperature, humidity, atmosphere) of specifying; simultaneously the electric control system of high-voltage DC power supply 14 applies the extra electric field of specifying to sample to be tested by direct current protecting resistance 11, dielectric is occurred under the effect of the composite factor such as electric, hot aging.During test, under the condition of not interrupting ageing process, discretely timing tour inspection is carried out to multiple sample to be tested, realize the development law measuring each sample to be tested Space-charge continuously.When carrying out space charge measurement to one of them sample, impulse source 17 applies a high-voltage pulse signal by capacitance 9 pairs of samples to be tested 23, sensor 6 converts pressure wave signal to electric signal, after amplifier 18 amplifies, deliver to oscillograph 16 again, the high-voltage pulse exported through overdamping afterpulse source 17 delivers to oscillograph 16 as trigger source simultaneously.Computing machine 15 reads the distribution situation of the space charge of sample to be tested 23 from oscillograph 16 by data acquisition program.For other sample to be tested, in order to prevent introducing interference from capacitance 9, by ground joint 13 ground connection of a band switch, when needs measurement space electric charge, high-voltage pulse is applied on sample to be tested by capacitance 9.
A few cover PEA space charge measurement mechanism not only puts on disk 4 by measurement mechanism of the present invention, and its measure portion is improved, be shifted out being arranged on the amplifier 18 of electroacoustic pulsedly on the downside of electrode 7 in shielding box 5 in prior art, package unit is made to share an amplifier 18, while increasing substantially test efficiency, save experimentation cost, measure portion enlarged drawing as shown in Figure 3.The electric signal exported by sensor 6 delivers to coaxial socket 20 (in one embodiment of the invention via the good connecting line 19 of shielding, coaxial socket is SMA type), signal after amplifier 18 amplifies delivers to oscillograph 16 via coaxial socket 20 by connecting line 20, in shielding case 22, direct supply 21 is powered for amplifier 18.Because the signal obtained from sensor is very faint, in order to improve signal to noise ratio (S/N ratio), connecting line 19 must have higher shielding properties, and shielding box 22 and the necessary no-float of coaxial socket 20, prevent from introducing external interference simultaneously.
Utilize in the work system of proving installation of the present invention, high-voltage DC power supply 14 separates multiple branch after drawing, each electric loop of independent control.High-voltage DC power supply 14 leading point place adopts But rotary joint, makes when rotary turnplate 4, and each electric loop can rotate relatively high pressure direct supply 14 leading point.Two dual pressure control switches and an isolating switch each electric loop be equipped with, isolating switch is contained in the middle of two dual pressure control switches, the sample that can meet any one loop like this can disconnect rapidly this loop when puncturing, after more finishing changing new sample, by close circuit breaker and dual pressure control switch, can be put into operation again in this loop.
Claims (1)
1. one kind for the space charge measurement device in dielectric long-term ageing process, it is characterized in that this measurement mechanism comprises support, rotating disk, publicly electrode, high-voltage DC power supply and multiple space charge measurement mechanism, also comprise impulse source, amplifier, oscillograph and computing machine; Wherein, described electrode is publicly fixed on described support by turntable bearing, and described rotating disk is coaxially fixed on the top of electrode publicly, and described multiple space charge measurement mechanisms are uniform along described disk peripheral; By electroacoustic, electrode, high-field electrode, sensor form pulsedly in described space charge measurement mechanism; Described electroacoustic pulsedly electrode is fixed on rotating disk; Described high-field electrode is placed in high-field electrode shell, high-field electrode is made up of capacitance, high voltage direct current protective resistance and high-voltage output electrode, described high-voltage DC power supply is connected with the high voltage direct current protective resistance of multiple space charge measurement mechanisms mesohigh electrode, described high-voltage output electrode and electroacoustic place sample to be tested in electrode centre pulsedly, the high-voltage output end of described impulse source is connected with the capacitance of the high-field electrode in each space charge measurement mechanism, and the low-voltage output of impulse source is connected with described oscillograph; The two ends of described amplifier are connected with oscillograph with the sensor in each space charge measurement mechanism with signal wire respectively by coaxial socket, and described computing machine is connected with oscillograph by signal wire.
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104297575B (en) * | 2014-10-14 | 2017-01-18 | 中国南方电网有限责任公司电网技术研究中心 | PEA space charge measurement system and method under full-size high-voltage direct current cable temperature control gradient |
| CN104655945B (en) * | 2015-03-12 | 2018-04-24 | 国家电网公司 | A kind of device and method for measuring oil-paper combination insulation space of components distribution of charges |
| CN104833867B (en) * | 2015-04-30 | 2017-09-12 | 南京南瑞集团公司 | Signal enhancing type pressure wave method model cable space charge test system |
| CN104965125B (en) * | 2015-06-25 | 2017-11-21 | 全球能源互联网研究院 | A kind of measuring system of cable accessory insulator interface electrical conductivity |
| CN105425057A (en) * | 2015-11-11 | 2016-03-23 | 西南大学 | Dielectric material space charge testing device based on electro-acoustic pulse method |
| DE112017007072B4 (en) * | 2017-02-15 | 2023-03-30 | Sumitomo Electric Industries, Ltd. | Method of manufacturing a power cable and method of testing a power cable |
| CN109142894B (en) * | 2018-07-05 | 2020-11-24 | 清华大学 | Direct current wire corona space charge distribution testing method based on coupling equipotential principle |
| CN108957158B (en) * | 2018-07-30 | 2020-09-01 | 上海交通大学 | Multi-sample space charge simultaneous measurement device based on electroacoustic pulse method |
| CN109669057B (en) * | 2019-02-22 | 2020-06-19 | 清华大学 | Quantitative characterization method and device for dielectric micro interface charge and trap characteristics |
| CN110223576B (en) * | 2019-05-23 | 2021-07-06 | 电子科技大学 | Signal sampling teaching demonstration instrument based on complex plane |
| CN111175549B (en) * | 2020-01-03 | 2020-11-27 | 同济大学 | Composite probe for measuring polymer space charge distribution and measuring method thereof |
| 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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| CN1873744A (en) * | 2005-06-02 | 2006-12-06 | 飞而康公司 | Rotation-type display panel testing device and display panel testing method using the same |
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| JP2001041989A (en) * | 1999-07-28 | 2001-02-16 | Kansai Electric Power Co Inc:The | Space charge measuring device |
| JP2002048829A (en) * | 2000-08-03 | 2002-02-15 | Mitsubishi Electric Corp | Impulse voltage measuring device |
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| CN1873744A (en) * | 2005-06-02 | 2006-12-06 | 飞而康公司 | Rotation-type display panel testing device and display panel testing method using the same |
| CN101706537A (en) * | 2009-11-16 | 2010-05-12 | 华北电力大学 | PEA space charge test device capable of testing conductive current |
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