CN102520259A - Multi-sample surface charge measuring device - Google Patents
Multi-sample surface charge measuring device Download PDFInfo
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- CN102520259A CN102520259A CN2011104072166A CN201110407216A CN102520259A CN 102520259 A CN102520259 A CN 102520259A CN 2011104072166 A CN2011104072166 A CN 2011104072166A CN 201110407216 A CN201110407216 A CN 201110407216A CN 102520259 A CN102520259 A CN 102520259A
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Abstract
The invention belongs to the technical field of electrical parameter measurement and relates to a multi-sample surface charge measuring device, comprising an insulating bracket, an insulating board, an electrostatic potentiometer and an electrostatic probe connected with the electrostatic potentiometer. The multi-sample surface charge measuring device is characterized in that the measuring device also comprises an electrostatic probe insulating support frame, a rim band, a stepping motor and a wheel shaft which is driven by the stepping motor and drives the rim band to rotate, wherein the electrostatic probe is fixed on the electrostatic probe insulating support frame and used for measuring the surface charge of a sample to be measured on the insulating board, a chute and a seamed edge which are matched with each other are respectively arranged on the contact part of the electrostatic probe insulating support frame and the insulating bracket, and the electrostatic probe insulating support frame is connected with the rim band by a rim band connecting head, and can slide along the insulating bracket along with the rotation of the rim band. The multi-sample surface charge measuring device can rapidly measure the multi-sample surface charge under the same temperature and humidity condition.
Description
Technical field
The present invention relates to a kind of many specimen surfaces charge detecting device, belong to the electrical parameter field of measuring technique.
Background technology
Along with the raising of high voltage power transmission electric pressure, the field intensity that requires insulating material to bear is increasingly high.Research is illustrated in that space charge and surface charge can appear in insulating medium inside and surface under the effect of applied voltage.Particularly for the direct current system for ultra-high voltage transmission, high electric field intensity can make electric charge gather and become even more serious.The existence of space electric charge distorts original Laplace electric field in the solid insulating material, causes internal field to strengthen, thereby causes insulation ag(e)ing, even may cause solid insulating material to puncture.Having of surface Charge possibly make insulator edge flashing voltage reduce; Whole creeping discharge process is accelerated; This can be to insulator arrangement, and especially (Gas Insulated Switchgear, insulating property GIS) constitute a threat to gas-insulated switchgear device.Therefore, the electric charge accumulation problems relevant with insulating material very important theory and practical significance have been studied.The surface charge measuring technique is the basis of surface charge research, all has great significance for various electrical characteristics, mechanism and the study on the modification of dielectric substance.
The surface charge measuring method is the surface charge based measurement.The measurement of surface charge receives the influence of extraneous factors such as humidity, temperature easily, and receives the restriction of sensor construction, and different measuring method often diversity ratio is bigger.Present surface charge measuring method comprises: dust figure method, static probe method and based on the measuring method of pockels effect.
1. dust figure method
Dust figure method is proposed in 1778 by Lichtenberg, and its principle is to utilize the adsorption effect of some charged solid powder under the static charge effect that the surface is observed.During measurement, dust evenly is sprayed at the dielectric surface that has gathered electric charge, through the gathereding degree of observing surface dust and polarity and the distribution situation that color is judged this surface charge.This method is replenishing as other measuring methods usually.Its advantage is convenient, directly perceived, and shortcoming is accurate surface measurements charge value, and in the process of spraying, may change the CHARGE DISTRIBUTION of dielectric surface, thus the surface charge situation of change dielectric surface itself.
2. based on the Pockels effect
People such as Kawasaki have proposed the surface charge measuring method based on the Pockels effect in 1991; This method is that transparent insulation film is attached to the plane of crystal with Pockels effect; The another side of crystal is through transparency electrode ground connection, and the electric field that produces between film surface electric charge and the earthing pole is directly proportional with surface charge density.According to the Pockels effect, when a branch of polarized light passes the crystal with Pockels effect, produce birefringent polarisation phase differential, this phase differential is directly proportional with electric field intensity.Therefore, utilize optical element to convert phase change into intensity variations, and light intensity distributions is imported Computer Processing, can obtain the distribution of film surface electric charge.People such as Kumada have developed based on the surface charge of Pockels effect probe, and this probe is made up of non-metal component, discharge with dielectric surface in the measuring process avoiding, and have higher measuring accuracy and spatial resolution.
3. static probe method
The static probe method is to use method comparatively widely in the surface charge field of measurement in the world at present.The static probe mainly is made up of induced inside conductor and external ground shielding protection layer.During measurement, will pop one's head near testing medium surface and keep at a distance constant.The electric charge of dielectric surface can excite induced voltage on sensor conductor, can obtain the relevant information of surface charge through measuring this magnitude of voltage.
Static probe ratio juris is proposed in 1967 by Davies the earliest, and think that classical probe output voltage U and surface charge density ρ have following linear relationship: U=M ρ, wherein M becomes scaling ratio.1984, Pedersen shifted proof onto through theory: have complicated nonlinear relationship between dielectric surface electric density and the probe induced voltage, introduced the discussion to the scaling ratio computing method thus.People such as Ootera adopt based on the three potential electrical fields calculating of surface method the surface charge distribution of 500KV HVDC GIS supporting insulator are measured; This method need be popped one's head in and the supporting insulator surf zone is divided; Calculated amount is big, and the surface charge Measuring Time is prolonged.Simultaneously, the area of testing medium thickness, charging zone, probe dielectric surface all possibly cause measurement result apart from factors such as distances and have a strong impact on.After this, preferably resolve scaling ratio problem in proposition in 1987 and by people such as Rerup in the λHan Shuo method of realization in 1996 by Pedersen.This method essence is the Poisson constant value computational problem with boundary condition, but the explanation of its boundary condition mistake the field source in the measurement space, so still there is certain problem in the use in the λHan Shuo method.2000, people such as Takuma investigated direct electric field computing method and λHan Shuo method measuring accuracy, proposed the method for getting the two result of calculation mean value.2003, people such as Allen delivered the surface charge density computing method based on minute function.Wherein, dividing the physical significance of function is dielectric surface unit charge inductive voltage value on the static probe.Calculate the branch function of probe through the charge simulation method, can calculate corresponding surface charge density.Ptfe surface CHARGE DISTRIBUTION situation is measured under Allen and the Faircloth employing branch functional based method impact voltage, obtains better effects, and 2004, people such as Kumada adopted further solution scaling ratio problem of Fourier transform and Wiener filtering technology.This method is converted into the electric field equation matrix in the space in the frequency domain through Fourier transform, original matrix inversion operation is changed into division arithmetic and inverse Fourier transform in the frequency domain, thereby avoided numerous and diverse matrix operation, has improved computing velocity.People such as Kumada measure based on the point and the distribution on needle plate electrode structure medium surface under this method impact voltage, have obtained charge resolution preferably.
Although Electric Field Numerical Calculation can solve the scale problem to a certain extent, for new electrode insulation subsystem to be measured, must repartition the zoning, reduced the universality of above-mentioned algorithm.In addition, sonde configuration has considerable influence to accurate electric Field Calculation result, has limited the application of said method in charge measurement.People such as Yashima research is pointed out, for the laminar insulating medium that has an even surface, if its thickness less (less than 5mm) then adopts linear scale method and the electric charge segment information that adopts the electric Field Calculation Scale Method to obtain to have consistance preferably.Therefore, when the regularity of distribution and the influence factor of investigating surface charge, when the experimental result under the different condition is carried out lateral comparison, adopt the linear scale method more suitable.Many documents have been investigated in the vacuum in the surface of polymer material CHARGE DISTRIBUTION and sulfur hexafluoride gas the characteristic of accumulation of dielectric surface electric charge under the surge voltage based on the linear scale method respectively, have verified the validity of linear scale method.
In sum, the measuring method of at present common surface charge mainly contains dust figure method, static probe method and based on the multiple measuring methods such as measuring method of pockels effect.Therefore above measurement means all can't observe simultaneously and study the multi-piece insulator surface charge comparatively easily, and the generation and the behavioral trait that are difficult under the condition such as same temperature humidity simultaneously the multi-piece insulator surface charge make an explanation.Though the static probe method has significant advantage, the price of the high probe of precision is higher, and the method for therefore measuring the polylith sample simultaneously with a probe is a kind of practical method.The present invention is based on the static probe method, designed the system that a cover can be observed the multi-piece insulator surface charge simultaneously for example, for the accurate measurement of polylith dielectric surface electric charge provides a kind of new measurement means with the rondelle sample.
Summary of the invention
For the measuring method that overcomes existing surface charge must be measured for the polylith sample one by one; The cycle of expending time in is longer; Humiture during this time changes easily; Thereby for the defective that measurement result can't accurately be compared, the present invention provides a kind of can being implemented in to carry out the device that many specimen surfaces electric charge is measured fast under the identical temperature and humidity conditions.Technical scheme of the present invention is following:
A kind of many specimen surfaces charge detecting device; Comprise insulating support (9); Be placed on the insulcrete (2) on the insulating support (9); Insulcrete (2) is used to place a plurality of samples, and electrometer (10) and coupled static probe (5) is characterized in that; Described device also comprise static probe insulation bracing frame (4), wheel band (3), stepper motor and and the wheel shaft (7) that rotated by step motor drive and driven wheel band (3); Static probe (5) is fixed on the static probe insulation bracing frame (4), is used for measuring the surface charge that is placed on the sample to be tested on the insulcrete (2), and contacted position offers chute and the seamed edge that cooperatively interacts respectively between static probe insulation bracing frame (4) and the insulating support (9); Static probe insulation bracing frame (4) is connected with the wheel band through wheel band connector (8), can slide along insulating support (9) along with the rotation of wheel band.
Advantage of the present invention and beneficial effect: 1. adopt many samples automatic measurement system to save time, be convenient to use manpower and material resources sparingly; 2. adopt the one-point measurement of wheel band, precisely error free, improve measuring reliability and accuracy; 3. the number of sample can arbitrarily be provided with, and the thickness of sample can be regulated arbitrarily, and is convenient and swift; 4. experimental provision is easy to be durable, and measurement result is more reliable, succinct.
Description of drawings
Fig. 1 is sample placement location of the present invention and device vertical view.Symbolic representation among Fig. 1: tested insulation sample 1; Insulcrete 2; Wheel is with 3; Static probe insulation bracing frame 4; Static probe 5.
Fig. 2 is a device construction profile of the present invention.Symbolic representation among Fig. 2: tested insulation sample 1; Insulcrete 2; Wheel is with 3; Static probe insulation bracing frame 4; Static probe 5; Probe measurement gauge point 6; Wheel shaft 7; Static probe insulation bracing frame and wheel band connector 8; Insulating support 9; Electrometer 10; PC 11.
Fig. 3 measures the surface charge density experimental data that 4 kinds of dissimilar epoxide resin materials obtain.
Fig. 4 measures the surface charge density experimental data that 8 kinds of dissimilar polythene materials obtain.
Embodiment
Like Fig. 1, shown in 2, fundamental purpose of the present invention is to realize the function of many samples all automatic measurement surface charge, realizes the short time measurement simultaneously to surface charge, and can realize the corresponding to effect of temperature and humidity conditions.The object of the invention can reach through following measure: many specimen surfaces charge detecting device of the present invention, it consists predominantly of: electrometer 10, static probe 5, static probe support frame 4, wheel are with 3, insulating support 9 and PC 11 etc.The present invention gathers correspondence markings point surface charge value through the static probe; And with the signal input electrometer that collects; Convert digital signal then to, read and record data through PC again, thereby realize purpose many specimen surfaces electric charge all automatic measurement.
Surface charge measuring device of the present invention; The both sides of insulating support 9 offer chute (not drawing among the figure); Static probe insulation bracing frame 4 is provided with the seamed edge (not drawing among the figure) that cooperatively interacts with chute with insulating support 9 contacted positions, and static probe insulation bracing frame 4 can slide on insulating support 9 along chute.Static probe insulation bracing frame 4 with the connected mode of wheel band connector 8 is: static probe insulation bracing frame 4 directly closely is connected with the upper strata wheel band of wheel band, takes turns with the lower floor that wheel is with and is with cooperation and is slidingly matched (directly not linking to each other).Static probe 5 is fixed in the hole in the middle of the upper surface of static probe insulation bracing frame 4, static probe insulation bracing frame 4 corresponding translation along with the rotation of wheel band.Insulating support 9 is the supporting bracket of whole device.
The static probe 5 of present embodiment adopts TREK-6000B-5C, and the distance of probe distance specimen surface is 3mm during measurement; Said electrometer 10 adopts TREK-347-3HCE, can provide ± measuring accuracy and the 3mm spatial resolution of 3V; Stepper motor, wheel with 3 with wheel shaft 7 high precision stepper motor, synchronizing wheel band and synchronous pulley for cooperatively interacting, this stepper motor model is a 57mm series two-phase hybrid stepping motor (torque is 0.6N/m), (transmission efficiency is high for polyurethane synchronizing wheel band for the wheel band; Be suitable for high load capacity, use under the high-frequency), wheel shaft is that the synchronous wheel shaft corresponding with the synchronizing wheel band is (by steel; Aluminium alloy; Cast iron, brass, plastic or other material manufacturing).Wherein the step distance of stepper motor can be come corresponding the setting according to the variation of sample measurement gauge point position.
Concrete measuring process is following:
1. the central point alignment mark point 6 with sample 1 is placed on the insulcrete 2 according to this;
2. wheel shaft 7 is by Electric Machine Control, and the unlatching of motor is controlled by relay, in advance according to distance between two samples with stop gauge point 6 unlatching control time of relay be set, and setting measurement cycle length;
3. connect PC 11 and static probe pot 10 and the devices such as 7 of popping one's head in, and prepare by PC 11 automatic record data;
4. starter motor drives wheel shaft 7 rotating band driving wheel bands 3, and by the data of the surface charge of PC 11 journal samples;
5. when wheel shaft 7 driven wheel band 3 to tops/terminal sample, anti-phase is rotated also and is measured rapidly;
6. the surface charge that repeats above step to sample is zero or certain setting value;
7. according to the setting of Measuring Time, regularly close measurement mechanism.
The automatic measurement system that insulating material surface charge provided by the invention distributes, the surface charge of in good time measurement polylith insulating material effectively fast.
Embodiment 1: adopt above-mentioned experimental procedure, it is as shown in Figure 3 to measure the surface charge density experimental data that 4 kinds of dissimilar epoxide resin materials obtain.Wherein, the residence time of probe on every sample is 0.2s, the required time 0.8s that once circulates, and total test duration is 60min.Experiment is carried out under the condition of room temperature, relative humidity 40%.At first material surface is charged.Charging is closed high-voltage power supply after finishing, and removes pin electrode, and the Kelvin type oscillatory type probe placement that will be connected in electrometer (Trek-347-3HCE) is measured its surface potential in 3mm place, sample top.
Surface charge density can be according to calculating as shown in the formula (1),
Wherein, σ is a surface charge density,
Be surface potential, d is a sample thickness, ε
0, ε
rBe respectively the relative dielectric constant of permittivity of vacuum and sample.
Embodiment 2: adopt above-mentioned experimental procedure, it is as shown in Figure 4 to measure the surface charge density experimental data that 8 kinds of dissimilar polythene materials obtain.Wherein, the residence time of probe on every sample is 0.5s, the required time 4s that once circulates, and total test duration is 60min.Experiment is carried out under the condition of room temperature, relative humidity 50%.At first material surface is charged.Charging is closed high-voltage power supply after finishing, and removes pin electrode, and the Kelvin type oscillatory type probe placement that will be connected in electrometer (Trek-347-3HCE) is measured its surface potential in 3mm place, sample top.Utilize formula (1) can obtain Fig. 4.
Claims (1)
1. specimen surface charge detecting device more than a kind; Comprise insulating support (9); Be placed on the insulcrete (2) on the insulating support (9); Insulcrete (2) is used to place a plurality of samples, and electrometer (10) and coupled static probe (5) is characterized in that; Described device also comprise static probe insulation bracing frame (4), wheel band (3), stepper motor and and the wheel shaft (7) that rotated by step motor drive and driven wheel band (3); Static probe (5) is fixed on the static probe insulation bracing frame (4), is used for measuring the surface charge that is placed on the sample to be tested on the insulcrete (2), and contacted position offers chute and the seamed edge that cooperatively interacts respectively between static probe insulation bracing frame (4) and the insulating support (9); Static probe insulation bracing frame (4) is connected with the wheel band through wheel band connector (8), can slide along insulating support (9) along with the rotation of wheel band.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103149462A (en) * | 2012-11-22 | 2013-06-12 | 天津学子电力设备科技有限公司 | Improvement on polyimide film surface charge measuring method |
| CN104133134A (en) * | 2014-07-16 | 2014-11-05 | 奉化市宇创产品设计有限公司 | Corona charge measuring device |
| CN104155547A (en) * | 2014-07-30 | 2014-11-19 | 奉化市宇创产品设计有限公司 | Charge attenuation measuring device |
| CN106199246A (en) * | 2016-06-28 | 2016-12-07 | 华北电力大学（保定） | A kind of fast evaluation method of composite insulator degree of aging |
| CN106226609A (en) * | 2016-09-28 | 2016-12-14 | 南方电网科学研究院有限责任公司 | A kind of insulant surface charge measuring device |
| CN106680679A (en) * | 2017-01-06 | 2017-05-17 | 云南电网有限责任公司电力科学研究院 | Cable insulating material surface charge measuring device and method |
| CN108490276A (en) * | 2018-01-25 | 2018-09-04 | 天津大学 | A kind of polypropylene film temperature field lower surface charge detecting device and measurement method |
| CN110346658A (en) * | 2019-07-30 | 2019-10-18 | 合肥工业大学 | A kind of measuring device of material surface charge |
| CN111766457A (en) * | 2020-05-25 | 2020-10-13 | 湖南大学 | GIL insulator surface charge on-line monitoring system based on electrostatic probe |
| CN112415291A (en) * | 2020-10-21 | 2021-02-26 | 西安理工大学 | Controllable perspective surface charge test system of humiture |
| CN113484623A (en) * | 2021-05-28 | 2021-10-08 | 中国电力科学研究院有限公司 | Tubular insulating part space charge measuring device |
| CN114089050A (en) * | 2021-11-15 | 2022-02-25 | 清华大学 | Online measurement method and device for surface charge distortion electric field of GIS insulator |
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| CN101788613A (en) * | 2010-01-15 | 2010-07-28 | 清华大学 | Four-dimensional self-adaptive insulation piece surface charge measuring device |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103149462A (en) * | 2012-11-22 | 2013-06-12 | 天津学子电力设备科技有限公司 | Improvement on polyimide film surface charge measuring method |
| CN104133134A (en) * | 2014-07-16 | 2014-11-05 | 奉化市宇创产品设计有限公司 | Corona charge measuring device |
| CN104155547A (en) * | 2014-07-30 | 2014-11-19 | 奉化市宇创产品设计有限公司 | Charge attenuation measuring device |
| CN106199246B (en) * | 2016-06-28 | 2019-03-12 | 华北电力大学（保定） | A kind of rapid detection method of composite insulator degree of aging |
| CN106199246A (en) * | 2016-06-28 | 2016-12-07 | 华北电力大学（保定） | A kind of fast evaluation method of composite insulator degree of aging |
| CN106226609A (en) * | 2016-09-28 | 2016-12-14 | 南方电网科学研究院有限责任公司 | A kind of insulant surface charge measuring device |
| CN106680679A (en) * | 2017-01-06 | 2017-05-17 | 云南电网有限责任公司电力科学研究院 | Cable insulating material surface charge measuring device and method |
| CN108490276A (en) * | 2018-01-25 | 2018-09-04 | 天津大学 | A kind of polypropylene film temperature field lower surface charge detecting device and measurement method |
| CN110346658A (en) * | 2019-07-30 | 2019-10-18 | 合肥工业大学 | A kind of measuring device of material surface charge |
| CN111766457A (en) * | 2020-05-25 | 2020-10-13 | 湖南大学 | GIL insulator surface charge on-line monitoring system based on electrostatic probe |
| CN112415291A (en) * | 2020-10-21 | 2021-02-26 | 西安理工大学 | Controllable perspective surface charge test system of humiture |
| CN113484623A (en) * | 2021-05-28 | 2021-10-08 | 中国电力科学研究院有限公司 | Tubular insulating part space charge measuring device |
| CN113484623B (en) * | 2021-05-28 | 2023-12-01 | 中国电力科学研究院有限公司 | Tubular insulator space charge measuring device |
| CN114089050A (en) * | 2021-11-15 | 2022-02-25 | 清华大学 | Online measurement method and device for surface charge distortion electric field of GIS insulator |
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Application publication date: 20120627 Assignee: YANGZHOU SHUGUANG CABLE Co.,Ltd. Assignor: Tianjin University Contract record no.: X2022980007410 Denomination of invention: A multi sample surface charge measuring device Granted publication date: 20140409 License type: Common License Record date: 20220609 |