CN203965529U - A kind of insulating material surface charge Two dimensional Distribution automatic measurement system - Google Patents
A kind of insulating material surface charge Two dimensional Distribution automatic measurement system Download PDFInfo
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- CN203965529U CN203965529U CN201420518070.1U CN201420518070U CN203965529U CN 203965529 U CN203965529 U CN 203965529U CN 201420518070 U CN201420518070 U CN 201420518070U CN 203965529 U CN203965529 U CN 203965529U
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Abstract
The utility model discloses a kind of insulating material surface charge Two dimensional Distribution automatic measurement system, comprise that inside is provided with the airtight cavity of two-dimentional automatically controlled displacement platform, test product to be measured is fixed on two-dimentional automatically controlled displacement platform by the back plate electrode of vertical setting, and the two ends up and down of test product to be measured connect respectively high-field electrode and ground-electrode; The tache motorice of One-Dimension Magnetic coupling straight line rotating driver is provided with insulation fixture, Kelvin probe is fixed on insulation fixture, the sensing point of Kelvin probe is perpendicular to test product to be measured, the electrometer of the output signal lead-in wire airtight cavity outside of Kelvin probe connects, the signal output part of electrometer connects the data acquisition system (DAS) of computing machine, the opposite side of airtight cavity is provided with connecting pipe, and the end of connecting pipe is provided with vacuum pump.The utility model, for measuring the surface charge density Two dimensional Distribution of insulating material, has enriched the Study about AC Flashover Characteristic content of insulating material and the means that CHARGE DISTRIBUTION is measured.
Description
Technical field
The utility model relates to solid insulating material flash-over characteristic field tests, relates in particular to a kind of insulating material surface charge density Two dimensional Distribution automatic measurement system.
Background technology
At present, solid-gap compound inslation system is widely used in the field such as high voltage electric power equip ment, high power vacuum equipment, solid-gap compound inslation system is selected different atmosphere according to different application scenarios, as insulator used for transmission line is exposed under atmospheric conditions, gas-insulated combined switch (GIS) adopts SF
6gas-insulated, high-power equipment often adopts vacuum-dielectric insulation.Solid-gap become the weak link of solid-gap compound inslation system along face because easily there is creeping discharge problem, become the key technical problem of restriction high voltage equipment insulation.
Taking vacuum surface insulation as example, solid insulating material vacuum creeping discharge characteristic and its surface charge accumulation have close contacting.According to secondary snowslide theory, it is generally acknowledged that primary electron is launched in negative electrode three junctions (negative electrode-vacuum-insulator) because electric field is concentrated under pulse voltage effect, these electronics are anode motion under DC Electric Field, in motion process, bump with material surface, thereby produce secondary electron; These secondary electrons can continue anode motion under electric field action, and with material surface, new collision occur and cause more secondary; In the time that secondary acquires a certain degree, can form electron avalanche passage at material surface, thereby cause edge flashing.Once can cause material surface positively charged with the collision of secondary electron and material surface, can the distort electric field of material surface of these positive charges, and attract more once to bump with secondary electron and material surface, thereby affect creeping discharge evolution.Under DC voltage, solid insulation more easily produces build-up of electrostatic charges problem along face, and build-up of electrostatic charges causes electric field distortion, causes surface insulation intensity under certain condition extremely to decline, and causes edge flashing.Therefore the CHARGE DISTRIBUTION of studying solid insulation surface is significant to creeping discharge development mechanism in vacuum.
Due to technical limitation problem, the problem such as existing insulating material surface charge measuring system adopts self-control static scanning probe material surface Potential distribution conventionally, and probe exists precision low, and anti-interference is poor, and signal to noise ratio (S/N ratio) is low, scanning result is not accurate enough.
Utility model content
The purpose of this utility model is to provide a kind of insulating material surface charge Two dimensional Distribution automatic measurement system, can measure accurately and efficiently insulating material surface charge density Two dimensional Distribution, for the flashover of research insulating material is offered help.
The utility model adopts following technical proposals:
A kind of insulating material surface charge Two dimensional Distribution automatic measurement system, comprise that inside is provided with the airtight cavity of two-dimentional automatically controlled displacement platform, the control data line of the automatically controlled displacement platform of two dimension is connected with the automatically controlled displacement platform control box of two dimension outside airtight cavity, the automatically controlled displacement platform control box of two dimension is connected with computing machine, one side surface of the back plate electrode vertically arranging is fixed on two-dimentional automatically controlled displacement platform, test product to be measured is vertically fixed on the opposite side surface of back plate electrode, and the two ends up and down of test product to be measured connect respectively high-field electrode and ground-electrode, one side of airtight cavity is provided with two and extends cavity, first extends the outside seal of cavity end is provided with One-Dimension Magnetic coupling straight line rotating driver, the tache motorice that is positioned at the One-Dimension Magnetic coupling straight line rotating driver of airtight cavity is provided with insulation fixture, Kelvin probe is fixed on insulation fixture, the sensing point of Kelvin probe is perpendicular to test product to be measured, the output signal lead-in wire of Kelvin probe is connected with the electrometer of airtight cavity outside by the probe output feed-through collar that is arranged on the second extension cavity end, the signal output part of electrometer connects the data acquisition system (DAS) of computing machine, the opposite side of airtight cavity is provided with connecting pipe, the end of connecting pipe is provided with vacuum pump.
On described airtight cavity, be provided with fine motion gas admittance valve and tensimeter, on connecting pipe, be provided with vacuum gauge.
The automatically controlled displacement platform of described two dimension is made up of transverse axis X and two automatically controlled displacement platforms of longitudinal axis Y.
Described airtight cavity adopts stainless steel airtight cavity.
The electrode structure of described test product to be measured is plane copper electrode, and copper electrode thickness is 0.2mm, adopts conductive double sided adhesive tape to be fitted in product to be tested surface.
Described data acquisition system (DAS) comprises signal condition module and data collecting card, data collecting card adopts NI PCI-6220, signal condition part realizes 1/2 dividing potential drop of electrometer output signal, signal input data collecting card after dividing potential drop gathers, and the electric potential signal after data acquisition is stored in the matrix corresponding with analyzing spot position.
The control data line of the described automatically controlled displacement platform of two dimension is connected with the automatically controlled displacement platform control box of two dimension outside airtight cavity by vacuum aircraft attaching plug.
Described Kelvin probe is coupled straight line rotating driver at 0mm-170mm scope fine adjustment with the distance on test product to be measured surface by One-Dimension Magnetic.
Described high-field electrode connects high-voltage power supply, direct current, interchange or surge voltage that high-voltage power supply output voltage is 0-100kV.
Described Kelvin probe adopts 3455ET probe, and electrometer adopts TREK-341B electrometer.
The utility model is by test product to be measured and Kelvin probe placement in stainless steel seal chamber, and in cavity, atmosphere can be vacuum, atmosphere or other gas, and gaseous tension is accurately controlled.Kelvin probe is fixed on an One-Dimension Magnetic coupling straight line rotating driver by insulation fixture, and probe detection point is perpendicular to product to be tested, with product to be tested surface distance can be adjustable and realize the screens of popping one's head in a wide range of precise at 0-170mm.Product to be tested two ends connect respectively plane high pressure and ground-electrode, be placed on two-dimentional automatically controlled displacement platform, the control data line of this displacement platform device is connected with the electric displacement platform controller outside cavity by vacuum aircraft attaching plug, then realizes electric displacement platform by computer software and automatically control.In the time that test product surface connects high pressure (alternating current-direct current impacts), probe is adjusted to 50mm with test product distance, and after high pressure is cancelled, probe shifts near to 1mm place, test product surface, and effects on surface current potential is measured.By the serpentine locomotion of computer control displacement table device, can realize the scanning of test product surface potential, simultaneously by computer data acquisition system by potential data storage and output, finally obtain insulating material surface charge density Two dimensional Distribution characteristic by surface potential Inversion Calculation.The Kelvin probe that the utility model adopts adopts self compensation technology to realize field intensity between probe detection position and product to be tested surface close to zero, thereby can measure very high surface potential.The utility model has solved the Insulation Problems of probe lead wire in measuring process by effective insulating flange design in addition, simultaneously at probe positions design laser range sensor, and coupled computer software control, realize the constant gap of popping one's head in product to be tested surface in scanning current potential process, greatly improved scanning and measuring accuracy.The utility model is for measuring the surface charge density Two dimensional Distribution of insulating material, for the flashover of research insulating material is offered help.
Brief description of the drawings
Fig. 1 is structural drawing of the present utility model.
Embodiment
As shown in Figure 1, insulating material surface charge Two dimensional Distribution automatic measurement system described in the utility model, comprise airtight cavity 1, airtight cavity 1 can adopt stainless steel airtight cavity 1, and the interior atmosphere of stainless steel airtight cavity 1 can be vacuum, atmosphere or other gas.
Stainless steel airtight cavity 1 inside is provided with two-dimentional automatically controlled displacement platform 2, and two-dimentional automatically controlled displacement platform 2 is made up of transverse axis X and two automatically controlled displacement platforms of longitudinal axis Y.Wherein, the automatically controlled displacement platform of transverse axis X adopts the Chinese light TSC30 that stands upright, and moving range is 30mm, minimum stepper distances 0.625 μ m; The automatically controlled displacement platform of longitudinal axis Y adopts the Chinese light TSA100 that stands upright, and moving range is 100mm, minimum stepper distances 1.25 μ m.Sweep limit is 30 × 100mm.The control data line of the automatically controlled displacement platform 2 of two dimension is connected with the automatically controlled displacement platform control box 3 of two dimension outside airtight cavity 1 by vacuum aircraft attaching plug, the automatically controlled displacement platform control box 3 of two dimension is connected with computing machine 4, and two-dimentional automatically controlled displacement platform control box 3 adopts SC300-3B control box.SC300-3B control box can coordinate LabVIEW to control software, realize the control to automatically controlled displacement platform 2 various ways of two dimension, control mode comprises to X, the independent manually control (stepping adds deduct) of Y-axis, to two kinds of modes of the snakelike autoscan of planar.
One side surface of the back plate electrode 5 vertically arranging is fixed on two-dimentional automatically controlled displacement platform 2, and test product 6 to be measured is vertically fixed on the opposite side surface of back plate electrode 5, and the two ends up and down of test product 6 to be measured connect respectively high-field electrode 7 and ground-electrode 8.The electrode structure of test product 6 to be measured is plane copper electrode, and copper electrode thickness is 0.2mm, adopts conductive double sided adhesive tape to be fitted in test product to be measured 6 surfaces.The advantage of this plane copper electrode structure is to remove can be treated immediately test article 6 after voltage and scan, and can not impact Kelvin 9 motions of popping one's head in.High-field electrode 7 connects high-voltage power supply, direct current, interchange or surge voltage that high-voltage power supply output voltage is 0-100kV.
One side of airtight cavity 1 is provided with two and extends cavity, first extends cavity 10 end outside seals is provided with One-Dimension Magnetic coupling straight line rotating driver 11, the tache motorice 12 of One-Dimension Magnetic coupling straight line rotating driver 11 is positioned at airtight cavity 1, and the tache motorice 12 of One-Dimension Magnetic coupling straight line rotating driver 11 is provided with insulation fixture 13, Kelvin probe 9 is fixed on insulation fixture 13, and the sensing point of Kelvin probe 9 is perpendicular to test product 6 to be measured simultaneously.The output signal lead-in wire of Kelvin probe 9 is connected with the electrometer 15 of airtight cavity 1 outside by the probe output feed-through collar that is arranged on the second extension cavity 14 ends, and the signal output part of electrometer 15 connects the data acquisition system (DAS) of computing machine 4.The data acquisition system (DAS) of computing machine 4 comprises signal condition module and data collecting card, data collecting card adopts NI PCI-6220, signal condition part realizes 1/2 dividing potential drop of electrometer 15 output signals, signal input data collecting card after dividing potential drop gathers, and the electric potential signal after data acquisition is stored in the matrix corresponding with analyzing spot position.
Kelvin probe 9 can adopt 3455ET probe, and electrometer 15 can adopt TREK-341B electrometer 15.Kelvin probe 9 adopts self compensation technology, and the design of probe micropore can obtain the spatial resolution that surface potential measurement is very high, can obtain very high response speed by built-in power and feedback control system, carries out surface potential tracking.Kelvin 9 current potentials of popping one's head in are identical with test product 6 surface potentials to be measured, field intensity between probe detection position and test product to be measured 6 surfaces is close to zero, can avoid probe and material surface to discharge, thereby realize the measurement in surface potential very high (reaching as high as ± 20kV) situation.To probe output feed-through collar 9 dielectric level requirement harshnesses, while requiring to measure all can not there is local faint electric discharge in air side and inlet side in probe output feed-through collar 9 when using Kelvin probe 9 and electrometer 15 to measure surface potential.The utility model passes through to improve flange ceramic leg insulating Design level, and builds the mode of epoxy resin in pillar space, efficiently solves this problem.
The distance on Kelvin probe 9 and test product to be measured 6 surfaces can be coupled straight line rotating driver 11 in 0mm-170mm scope fine adjustment the location of realizing Kelvin probe 9 by One-Dimension Magnetic, switches so that realize 9 protections of Kelvin probe and measure two kinds of patterns.In the time that test product surface connects high pressure (alternating current-direct current impacts), probe is adjusted to 50mm to prevent that high pressure is to probe electric discharge with test product distance; After high pressure is cancelled, probe shifts near to 1mm place, test product surface, and effects on surface current potential is measured.User can pass through computing machine 4 and two-dimentional automatically controlled displacement platform control box 3, the automatically controlled displacement platform 2 of control bit two dimension carries out serpentine locomotion, realize test product 6 surface potential scannings to be measured, pass through the data acquisition system (DAS) of computing machine 4 by potential data storage output simultaneously, finally obtain insulating material surface charge density Two dimensional Distribution characteristic by surface potential Inversion Calculation.
The opposite side of airtight cavity 1 is provided with connecting pipe 16, and the end of connecting pipe 16 is provided with vacuum pump 17, and vacuum pump 17 is made up of a mechanical pump and a molecular pump.On airtight cavity 1, be provided with fine motion gas admittance valve and tensimeter 18, on connecting pipe 16, be provided with vacuum gauge 19.Air pressure in airtight cavity 1 can be measured by the vacuum gauge 19 arranging on connecting pipe 16, and the vacuum tightness in airtight cavity 1 realizes by vacuum pump 17, and fine motion gas admittance valve and tensimeter 18 can carry out fine adjustment to the air pressure in airtight cavity 1.
In the time utilizing the utility model to carry out the measurement of insulating material surface charge density Two dimensional Distribution, carry out according to following steps:
(1) test product 6 to be measured is fixed on two-dimentional automatically controlled displacement platform 2 by back plate electrode 5, test product to be measured 6 two ends connect respectively and connect high-field electrode 7 and ground-electrode 8, adjust Kelvin probe 9 to scanning initial position, by the One-Dimension Magnetic straight line rotating driver 11 that is coupled, Kelvin probe 9 is moved to the distance surperficial 50mm of test product 6 to be measured place again, prevent that high-field electrode 7 from discharging to Kelvin probe 9.The output signal lead-in wire of Kelvin probe 9 is connected with the electrometer 15 of airtight cavity 1 outside by the probe output feed-through collar that is arranged on the second extension cavity 14 ends, and the sampled-data system of computing machine 4 can be exported and be accessed by electrometer 15 to surface potential measurement signal.
(2) atmosphere and pressure in the mechanical pump being provided with by the end of fine motion gas admittance valve, vacuum gauge 19 and connecting pipe 16 and molecular pump control airtight cavity 1.Then introduce high pressure by high-field electrode 7, experiment mesohigh can be direct current, interchange and the surge voltage of 0-100kV.Meeting guiding discharge under High Pressure, electric charge can be gathered in the surface of test product 6 to be measured.
(3) remove after high pressure, Kelvin probe 9 is moved to the distance surperficial 1mm of test product 6 to be measured place and measure.Test product 6 to be measured can carry out two dimensional motion by the automatically controlled displacement platform 2 of two dimension in the plane perpendicular to Kelvin probe 9, treats thereby realize the measurement that test article 6 surface charge densities distribute.
(4) the surface potential measurement signal that electrometer 15 is exported accesses the data acquisition system (DAS) of computing machine 4 after signal condition, the electric potential signal gathering is stored in the matrix corresponding with analyzing spot position, obtains thus test product 6 surface potential Two dimensional Distribution matrix datas to be measured.The surface charge density that can utilize surface potential Two dimensional Distribution data to calculate test product 6 to be measured by formula 1 distributes.
Wherein σ i is surface charge density, and unit is C/m2; Vi is surface potential, and unit is V; ε 0 is permittivity of vacuum; ε r is the relative dielectric constant of insulating material; D is material thickness/m.
Claims (10)
1. an insulating material surface charge Two dimensional Distribution automatic measurement system, it is characterized in that: comprise that inside is provided with the airtight cavity of two-dimentional automatically controlled displacement platform, the control data line of the automatically controlled displacement platform of two dimension is connected with the automatically controlled displacement platform control box of two dimension outside airtight cavity, the automatically controlled displacement platform control box of two dimension is connected with computing machine, one side surface of the back plate electrode vertically arranging is fixed on two-dimentional automatically controlled displacement platform, test product to be measured is vertically fixed on the opposite side surface of back plate electrode, and the two ends up and down of test product to be measured connect respectively high-field electrode and ground-electrode, one side of airtight cavity is provided with two and extends cavity, first extends the outside seal of cavity end is provided with One-Dimension Magnetic coupling straight line rotating driver, the tache motorice that is positioned at the One-Dimension Magnetic coupling straight line rotating driver of airtight cavity is provided with insulation fixture, Kelvin probe is fixed on insulation fixture, the sensing point of Kelvin probe is perpendicular to test product to be measured, the output signal lead-in wire of Kelvin probe is connected with the electrometer of airtight cavity outside by the probe output feed-through collar that is arranged on the second extension cavity end, the signal output part of electrometer connects the data acquisition system (DAS) of computing machine, the opposite side of airtight cavity is provided with connecting pipe, the end of connecting pipe is provided with vacuum pump.
2. insulating material surface charge Two dimensional Distribution automatic measurement system according to claim 1, is characterized in that: on described airtight cavity, be provided with fine motion gas admittance valve and tensimeter, be provided with vacuum gauge on connecting pipe.
3. insulating material surface charge Two dimensional Distribution automatic measurement system according to claim 2, is characterized in that: the automatically controlled displacement platform of described two dimension is made up of transverse axis X and two automatically controlled displacement platforms of longitudinal axis Y.
4. insulating material surface charge Two dimensional Distribution automatic measurement system according to claim 3, is characterized in that: described airtight cavity adopts stainless steel airtight cavity.
5. insulating material surface charge Two dimensional Distribution automatic measurement system according to claim 4, it is characterized in that: the electrode structure of described test product to be measured is plane copper electrode, copper electrode thickness is 0.2mm, adopts conductive double sided adhesive tape to be fitted in product to be tested surface.
6. insulating material surface charge Two dimensional Distribution automatic measurement system according to claim 5, it is characterized in that: described data acquisition system (DAS) comprises signal condition module and data collecting card, data collecting card adopts NI PCI-6220, signal condition part realizes 1/2 dividing potential drop of electrometer output signal, signal input data collecting card after dividing potential drop gathers, and the electric potential signal after data acquisition is stored in the matrix corresponding with analyzing spot position.
7. insulating material surface charge Two dimensional Distribution automatic measurement system according to claim 6, is characterized in that: the control data line of the described automatically controlled displacement platform of two dimension is connected with the automatically controlled displacement platform control box of two dimension outside airtight cavity by vacuum aircraft attaching plug.
8. insulating material surface charge Two dimensional Distribution automatic measurement system according to claim 7, is characterized in that: described Kelvin probe is coupled straight line rotating driver at 0mm-170mm scope fine adjustment with the distance on test product to be measured surface by One-Dimension Magnetic.
9. insulating material surface charge Two dimensional Distribution automatic measurement system according to claim 8, is characterized in that: described high-field electrode connects high-voltage power supply, direct current, interchange or surge voltage that high-voltage power supply output voltage is 0-100kV.
10. insulating material surface charge Two dimensional Distribution automatic measurement system according to claim 9, is characterized in that: described Kelvin probe adopts 3455ET probe, and electrometer adopts TREK-341B electrometer.
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| CN201420518070.1U CN203965529U (en) | 2014-09-10 | 2014-09-10 | A kind of insulating material surface charge Two dimensional Distribution automatic measurement system |
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| CN201420518070.1U CN203965529U (en) | 2014-09-10 | 2014-09-10 | A kind of insulating material surface charge Two dimensional Distribution automatic measurement system |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166055A (en) * | 2014-09-10 | 2014-11-26 | 国家电网公司 | Automatic measuring system for insulating material surface charge two-dimensional distribution |
| GB2539688A (en) * | 2015-06-24 | 2016-12-28 | Tecom Analytical Systems | Field Kelvin probe |
| WO2016209087A1 (en) * | 2015-06-24 | 2016-12-29 | Tecom As | Kelvin probe system with a rotating probe face |
| TWI639554B (en) * | 2016-05-20 | 2018-11-01 | 鴻海精密工業股份有限公司 | Method for measuring charge distribution on a surface of a nanostructure |
| CN108872804A (en) * | 2018-04-28 | 2018-11-23 | 海南电网有限责任公司电力科学研究院 | A kind of device to discharge for detecting solid insulation |
| CN109239434A (en) * | 2018-08-03 | 2019-01-18 | 上海交通大学 | The measuring device of surface potential on-line monitoring |
| CN111157895A (en) * | 2020-02-10 | 2020-05-15 | 哈尔滨理工大学 | High-voltage motor stator winding end surface potential measuring system |
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2014
- 2014-09-10 CN CN201420518070.1U patent/CN203965529U/en active Active
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104166055A (en) * | 2014-09-10 | 2014-11-26 | 国家电网公司 | Automatic measuring system for insulating material surface charge two-dimensional distribution |
| EP3314272A4 (en) * | 2015-06-24 | 2018-12-05 | Tecom AS | Kelvin probe system with a rotating probe face |
| GB2539688B (en) * | 2015-06-24 | 2020-06-24 | Indikel As | Field Kelvin probe |
| JP2018519533A (en) * | 2015-06-24 | 2018-07-19 | テコム・アクシェセルスカプＴｅＣｏｍ ＡＳ | Kelvin probe system with rotating probe surface |
| WO2016209087A1 (en) * | 2015-06-24 | 2016-12-29 | Tecom As | Kelvin probe system with a rotating probe face |
| GB2539688A (en) * | 2015-06-24 | 2016-12-28 | Tecom Analytical Systems | Field Kelvin probe |
| AU2016281432B2 (en) * | 2015-06-24 | 2021-08-05 | Indikel As | Kelvin probe system with a rotating probe face |
| US10620159B2 (en) * | 2015-06-24 | 2020-04-14 | Indikel As | Field Kelvin probe |
| TWI639554B (en) * | 2016-05-20 | 2018-11-01 | 鴻海精密工業股份有限公司 | Method for measuring charge distribution on a surface of a nanostructure |
| CN108872804A (en) * | 2018-04-28 | 2018-11-23 | 海南电网有限责任公司电力科学研究院 | A kind of device to discharge for detecting solid insulation |
| CN108872804B (en) * | 2018-04-28 | 2020-09-29 | 海南电网有限责任公司电力科学研究院 | Device for detecting solid insulation discharge |
| CN109239434B (en) * | 2018-08-03 | 2020-10-30 | 上海交通大学 | Measuring device for on-line monitoring of surface potential |
| CN109239434A (en) * | 2018-08-03 | 2019-01-18 | 上海交通大学 | The measuring device of surface potential on-line monitoring |
| CN111157895A (en) * | 2020-02-10 | 2020-05-15 | 哈尔滨理工大学 | High-voltage motor stator winding end surface potential measuring system |
| CN111157895B (en) * | 2020-02-10 | 2022-02-25 | 哈尔滨理工大学 | High-voltage motor stator winding end surface potential measuring system |
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