Insulation detection method for high voltage bushing based on frequency domain dielectric spectroscopy

Abstract

The invention relates to the technical field of insulation detection for high voltage equipment, in particular to an insulation detection method for a high voltage bushing based on frequency domain dielectric spectroscopy. The method comprises the step that a frequency domain dielectric spectroscopy based test is adopted to detect insulation of the bushing. With the adoption of the method, an influence of a Garton effect on measuring of tan delta at low voltage is avoided; a real tan delta frequency curve of the bushing at 0.001-1000Hz and at the low voltage is acquired and used for judging an insulation state of the bushing; and compared with the traditional bushing adopting a single 50Hz frequency point tan delta to judge the insulation state of the bushing, the judgment accuracy is improved. The test and a measuring device of the method are simple in structure and easy to operate, and the difficulty that the test and the device are difficult to operate when the measuring of the tan delta of the bushing is conducted at 0.001-1000Hz and at high voltage is solved.

Description

technical field [0001] The invention relates to the technical field of high-voltage equipment insulation detection, and in particular to a high-voltage bushing insulation detection method based on frequency-domain dielectric spectrum. The method uses a frequency-domain dielectric spectrum test to detect the insulation of the bushing. Background technique [0002] With the construction of ultra-high voltage and ultra-high voltage transmission projects, the increase of power transmission voltage level and transmission capacity, the requirements for safe and stable operation of power transmission and transformation equipment are increasing day by day. High-voltage bushing is one of the most important accessories widely used in power equipment to support and insulate. Its quality defects or failures can lead to extremely bad consequences, or cause huge economic losses or even casualties. At present, the frequency domain spectroscopy (FDS) test method based on the dielectric resp...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is: aiming at the deficiency of the dielectric loss frequency characteristics of the bushing under low voltage obtained by the existing frequency domain dielectric spectrum test and the traditional single power frequency dielectric loss measurement and evaluation of the bushing insulation state, to provide a method that can A high-voltage bushing insulation detection method based on frequency-domain dielectric spectrum that avoids the influence of the bushing Garton effect and accurately obtains the real dielectric loss frequency characteristics of the bushing in the range of 0.001Hz-1000Hz, so as to accurately evaluate the insulation state of the bushing

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