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Three-dimensional power frequency electric field measurement method and device capable of correcting distortion of electric field

A power frequency electric field and distortion correction technology, applied in the fields of electromagnetic field characteristics, voltage/current isolation, etc., can solve the problems of reduced measurement accuracy, small sensor size, and deviation of measurement results from the true value

Inactive Publication Date: 2011-07-06
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) In order to minimize the distortion effect of the sensor due to the space occupation, the sensor volume should be as small as possible; but the sensor volume is too small, and the measurement accuracy is reduced
[0007] (3) The measurement point is often in a high potential and strong field area, so the sensor of the measurement system and the post-stage signal processing part should be well isolated to reduce the signal transmission channel composed of connecting wires, probes and output devices as a source of emission, and the The interference caused by the electric field in the measurement area; and the electromagnetic induction phenomenon generated by the space electromagnetic field in these devices will cause the measurement results to seriously deviate from the true value

Method used

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  • Three-dimensional power frequency electric field measurement method and device capable of correcting distortion of electric field
  • Three-dimensional power frequency electric field measurement method and device capable of correcting distortion of electric field
  • Three-dimensional power frequency electric field measurement method and device capable of correcting distortion of electric field

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Embodiment 1

[0051] Example 1 Three-dimensional power frequency electric field measuring device capable of correcting electric field distortion

[0052] Such as image 3 , 4 As shown, the device includes a three-dimensionally combined capacitive induction voltage sensor 11, an amplifier circuit 12, a filter circuit 13, a high-speed data collector 14, a central information processor 15, a GSM data communication module 16, a power supply circuit 17, a GSM communication module 21, Data processing software 22 and PC machine 23 are formed. Each electrode copper plate for electric field measurement is isolated with insulating plastic to ensure that each plate is physically independent of each other. The connecting wires are welded to the edge of the copper plate, and the solder joints should be as small and smooth as possible, and the edge of the copper plate is also polished to be smooth, which can prevent the induced voltage from appearing due to the uneven charge distribution caused by the ...

Embodiment 2

[0053] Example 2 Distortion Influencing Factor lambda the acquisition of

[0054] Calibration experiments were carried out in the parallel plate electrode uniform electric field generator. According to the national standard GB / T12720-1991, the distance d between parallel plates in the uniform electric field generating device should not be less than 1.5 times the side dimension of the probe; the distance between the edge of the sensor and any edge of the bottom plate should not be less than 2d; the distance between the parallel plate and the nearest ground The distance between them should be greater than 2d. The design area of ​​the parallel plate is 1.5×1.5m, the thickness is 2mm, the distance d between the two plates is 0.5m, the sensor probe radius is 30mm, the ratio of the measuring electrode radius to the probe radius is fixed at 2 / 3, and the thickness of the electrode and the insulating medium is 1mm , the material property of the parallel plate electrode and the measur...

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Abstract

The invention relates to a three-dimensional power frequency electric field measurement method and a device capable of correcting the distortion of electric fields. In the method, three pairs of electrode boards of three capacitance type induced voltage sensors are respectively arranged vertical to the direction of a three-dimensional coordinate to form a three-dimensionally-combined capacitance type sensing voltage sensor probe; in a uniform electric field generating device, three induced voltage values and the electric fields corresponding to the three induced voltage values are measured when the directions of applied electric fields are consistent with an X axis, a Y axis and a Z axis; and then the distortion impact factors Lambada are obtained. The device consists of the three-dimensionally-combined capacitance type induced voltage sensor probe and a subsequent signal processing circuit. The method and the device improve the measurement accuracy of the sensors, collect remote measurement data, have the characteristics of small volume and light weight, and is convenient to install and carry; and the measurement accuracy error is about 5 percent. The method and the device are suitable for the measurement of the electric fields nearby transmission lines, transformer substations, high-voltage switch, living quarters and other neighboring areas.

Description

technical field [0001] The invention belongs to the field of power system power frequency electric field measurement, and relates to a three-dimensional power frequency electric field measurement method and device capable of correcting electric field distortion. Background technique [0002] In recent years, with the increase of the voltage level of the transmission line, the electric field distribution around the power transmission and transformation equipment and the electromagnetic compatibility of the power system have attracted more and more attention. Therefore, the measurement system of the power frequency electric field sensor has become the focus of research. [0003] For electric field measurement, there are mainly small ball method, capacitive charging method and various potential balance methods, all of which measure the electric field by measuring the potential distribution, so it is difficult for them to accurately measure the space electric field. The charge m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/08G01R15/16
Inventor 张占龙胡平黄嵩肖冬萍彭孟杰
Owner CHONGQING UNIV
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