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Assessment check and magnitude calibration method for ultrahigh-frequency partial-discharging tester

A partial discharge and ultra-high frequency technology, which is used in measuring devices, measuring electrical variables, instruments, etc., can solve the problems of uneven performance of ultra-high frequency partial discharge testers, and achieve the effect of shielding interference, convenient use and improving accuracy.

Active Publication Date: 2013-09-25
HANGZHOU XIHU ELECTRONICS INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the current situation that the performance of UHF partial discharge testers varies from good to bad, the present invention provides a method that can effectively evaluate and verify UHF partial discharge testers

Method used

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  • Assessment check and magnitude calibration method for ultrahigh-frequency partial-discharging tester
  • Assessment check and magnitude calibration method for ultrahigh-frequency partial-discharging tester
  • Assessment check and magnitude calibration method for ultrahigh-frequency partial-discharging tester

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Embodiment Construction

[0011] The present invention will be further described below in conjunction with accompanying drawing.

[0012] figure 1 In order to realize the structure diagram of the device used in this method, the GTEM cell 4 of the main body of the device adopts an all-metal structure; its input end adopts an N-type coaxial joint 3, and the inner conductor of the coaxial joint is flattened into a fan-shaped plate, that is, a core plate 5 . A rectangular uniform field area is formed between the core plate and the bottom plate in the GTEM chamber. The terminal of the GTEM cell is matched with a 50Ω non-inductive resistor, and the inner walls of the terminal 9 are wedge-shaped wave-absorbing materials 8 . The screen door 7 can be opened to replace the sensor under test 6 placed inside; the sensor under test can be connected to the instrument under test 10 or the spectrum analyzer 11 through the bottom interface.

[0013] The specific verification method is as follows:

[0014] 1. Sensiti...

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Abstract

The invention discloses an assessment check and magnitude calibration method for an ultrahigh-frequency partial-discharging tester. Presently, no uniform standard is used for assessing and checking the ultrahigh-frequency partial-discharging tester, so that effectiveness and reliability of detecting results are affected. The method uses a high-frequency signal generator to output sine wave signals which are converted into radio-frequency pulse signals through a pulse modulating device, then the radio-frequency pulse signals are emitted by a core board in a GTEM small chamber, and finally the radio-frequency pulse signals are received by a sensor to be tested. Instrument performance can be assessed through three indexes of flexibility, linearity and bandwidth, and the measured magnitude of an instrument to be tested can be calibrated. The method can construct a pulse electromagnetic field with adjustable frequency and adjustable magnitude, can effectively shield interference of external electromagnetic signals, improves assessment check accuracy and is convenient to use.

Description

technical field [0001] The invention belongs to the technical field of instrument detection, and relates to a method for checking and calibrating an ultra-high frequency partial discharge tester. Background technique [0002] Partial discharge detection is an effective means to evaluate the insulation status of power equipment. It is clearly pointed out in the enterprise standard Q / GDW-11-41.1~41.59-2011 "High Voltage Test Site Standardization Operation Guide" of Zhejiang Electric Power Company that GIS, transformers, Conduct partial discharge tests on electrical equipment such as voltage transformers and current transformers. Partial discharge tests on transformers, voltage transformers, and current transformers use the electric pulse method, and UHF ultra-high frequency methods or ultrasonic methods are used on GIS equipment. Partial discharge detection of GIS equipment using UHF partial discharge tester is an essential experimental item. [0003] The technology of partia...

Claims

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Application Information

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IPC IPC(8): G01R35/00
Inventor 胡维兴
Owner HANGZHOU XIHU ELECTRONICS INST
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