Online frequency domain dielectric spectrum detection method for insulating bush
A technology of frequency-domain dielectric spectrum and detection method, which is applied in the field of high-voltage insulation bushing detection, can solve problems such as difficult to realize and online monitoring of difficult insulation conditions, and achieve the effect of overcoming on-line monitoring and overcoming the insufficient sensitivity of insulation performance changes
A technology of frequency-domain dielectric spectrum and detection method, which is applied in the field of high-voltage insulation bushing detection, can solve problems such as difficult to realize and online monitoring of difficult insulation conditions, and achieve the effect of overcoming on-line monitoring and overcoming the insufficient sensitivity of insulation performance changes
CN110850178APending Publication Date: 2020-02-28ELECTRIC POWER RES INST OF GUANGXI POWER GRID CO LTD
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[0024] In order to make the purposes, technical solutions and advantages of the embodiments of the application more clear, the following will combine the figure 1 , clearly and completely describe the technical solutions in the implementation manners of the present application. Obviously, the described implementation manners are part of the implementation manners of the present application, rather than all the implementation manners. Based on the implementation manners in this application, all other implementation manners obtained by persons of ordinary skill in the art without creative efforts fall within the scope of protection of this application. Accordingly, the following detailed description of the embodiments of the application, provided in the accompanying drawings, is not intended to limit the scope of the claimed application, but merely represents selected embodiments of the application. Based on the implementation manners in this application, all other implementatio...
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The invention discloses an online frequency domain dielectric spectrum detection method for an insulating bush, and relates to the technical field of high-voltage insulating sleeve detection. The method comprises the following steps: S1, obtaining voltage and current signals at a high-voltage bush; S2, calculating a harmonic voltage and a harmonic current at the high-voltage bush; S3, calculatingthe complex capacitance of the main insulation of the bush within a certain frequency band range through the amplitude and phase relation; S4, calculating the frequency spectrum of the complex dielectric constant; S5, completing online monitoring of the frequency domain dielectric spectrum. According to the invention, the complex capacitance and the complex dielectric constant of a bushing main insulation system are calculated by using fundamental frequency and high-frequency components contained in steady-state harmonic waves; the passive online monitoring of the frequency domain dielectric spectrum of the bush can be realized without offline testing of equipment or active injection of broadband voltage signals, the problem that power frequency dielectric loss is not sensitive enough to insulation performance change is solved, and the problem that online monitoring is difficult to realize in traditional frequency domain dielectric spectrum testing is also solved.
Description
technical field [0001] The invention relates to the technical field of high-voltage insulating bushing detection, in particular to an online frequency-domain dielectric spectrum detection method for insulating bushings. Background technique [0002] The oil-immersed high-voltage insulating bushing is an important auxiliary safety device for large power transformers. It plays the role of leading the high-voltage and low-voltage leads inside the transformer from the transformer during the operation of the transformer. The high-voltage insulating bushing not only realizes the connection between the transformer and the external electrical The connection of the network also realizes the insulation effect of the transformer lead wire and the transformer shell. Under special working conditions such as electrical, thermal and mechanical stress during long-term operation of the bushing, abnormal operation of equipment or environmental factors, oil-paper insulation may suffer from dam...
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Patent Timeline
28 Feb 2020
Publication
CN110850178A
- IPC
- G01R27/26
- CPC
- G01R27/2617
- Inventors
- 颜海俊; 黎大健