Insulator surface electric charge online measuring probe and measuring method thereof

A surface charge, measuring probe technology, applied in the measurement of electrical variables, measuring devices, instruments, etc., can solve the problems of directly measuring the surface charge of insulators, measurement results error, etc., to achieve the effect of compact structure, large leakage distance, and reduced capacitance

Inactive Publication Date: 2014-06-04
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the past, the online measurement system in the product can only measure the surface charge of the insulator in the air, but cannot directly measure the surface charge of the insulator in the vacuum, otherwise it will affect the vacuum degree and cause a large error in the measurement result.

Method used

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  • Insulator surface electric charge online measuring probe and measuring method thereof
  • Insulator surface electric charge online measuring probe and measuring method thereof
  • Insulator surface electric charge online measuring probe and measuring method thereof

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Embodiment

[0067] Such as Figure 4 as shown, Figure 4 The vacuum degree in the vacuum chamber is 1×10 -3 In the case of Pa, the relationship curve of the input and output of the electrostatic charge measurement system measured at a distance of 2.0mm from the surface of the measured conductor to the electrostatic charge probe.

[0068] From Figure 4 It can be found that the linear response characteristic of this charge measurement system is very good, and its input voltage (surface potential U 1 ) and output (electrostatic charge probe output voltage U 2 ) relationship is: U 2 =65U 1 -33;

[0069] According to formula Can get C 2 / (C 1 +C 2 ) is 65×10 -6 , known C 1 is 113pF, from which C 2 is 7.345×10-15F, thus further calculating (1) The equivalent area of ​​the electrostatic charge probe is 1.66mm 2 , with a diameter of 1.454mm. The relationship between its output voltage (in mV) and the surface charge density is:

[0070] σ=0.068(U 2 +33) (μC / m 2 ).

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Abstract

The invention relates to an insulator surface electric charge online measuring probe and a measuring method of the insulator surface electric charge online measuring probe. The probe comprises an SMA connector, a shielding part, a coaxial cable and an electrometer. The SMA connector is connected with the coaxial cable through the shielding part. The coaxial cable is connected with the electrometer. The method includes the following steps that firstly, the probe is installed and forms a capacitor C2 with the tested electric charge; secondly, the input voltage U1 is regulated and the output voltage U2 is recorded; thirdly, a change relation curve between the U1 and the U2 is recorded; fourthly, as a C1 is 113pF, a C2 is calculated out through the formula in the specifications; fifthly, capacitance equivalent area A is calculated out through a capacitance computing formula with the C2; sixthly, sensitivity S is calculated out through a formula S=C1 / A; seventhly, the charge density is calculated out through a formula that sigma equals to SU2. By means of the insulator surface electric charge measuring method, the safety state of the GIS can be effectively estimated and the method has a major significance in safe operation of the GIS.

Description

technical field [0001] The invention relates to a charging detection device, in particular to an on-line measuring probe for the surface charge of an insulator and a measuring method thereof. Background technique [0002] Insulators on many high-power devices such as X-ray tubes, high-power klystrons, neutron beam diodes, pulse power switches, particle accelerators, and large-scale cutting-edge equipment are generally used in a vacuum environment, and the flashover of the insulators along the surface causes product damage. The phenomenon occurs from time to time, and the surface flashover phenomenon of insulators in vacuum restricts the electrical insulation performance of the above-mentioned devices and equipment. precise. After long-term observation and research, the inventor found that due to the above reasons, a convenient and accurate device and method for monitoring the distribution of charges in insulators in real time is needed to judge the occurrence of flashover a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/24
Inventor 成俊奇丁立健
Owner STATE GRID CORP OF CHINA
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