Combined electric appliance partial discharge vibration detection method

Abstract

The invention relates to a combined electric appliance partial discharge vibration detection method. The technical characteristic is that the method comprises: selecting detection positions on a tested pipe section and a reference pipe section; detecting a vibration signal by using an acceleration sensor; performing fast Fourier transform on the detected vibration signal and calculating the maximum amplitude of the frequency spectrum of the vibration signal; and comparing the maximum amplitude of the frequency spectrum of the vibration signal of the tested pipe section with the maximum amplitude of the frequency spectrum of the vibration signal of the reference pipe section, and judging whether the tested pipe section has a partial discharge fault or not, so that the effect of accurately detecting the partial discharge fault of the gas insulated switchgear is achieved. Equipment used in the method is small, use and moving are convenient, and accuracy is. The equipment is free of electrical connection with a tested pipe section and free of any influence on the running state of equipment, and by adding the vibration test technology into the electrical equipment fault diagnosis method, fault hidden dangers can be found earlier compared with an electrical detection electrical equipment fault diagnosis method.

Description

technical field [0001] The invention belongs to the technical field of fault diagnosis of power transmission and transformation equipment, in particular to a method for detecting partial discharge vibration of a combination electrical appliance. Background technique [0002] Gas-insulated combined electrical equipment is a complete set of electrical devices composed of a variety of high-voltage electrical installations, main wiring and system functions. It encapsulates common equipment in substations such as busbars, voltage transformers, current transformers, lightning arresters, isolating switches, circuit breakers, etc. through a cylinder filled with high-voltage SF6 insulating gas, so as to achieve strong system, high integration, It is one of the most important electrical equipment in high-voltage direct current engineering, and it is widely used in power systems of various voltage levels from 66 to 1000kV. [0003] Although the reliability of combined electrical appli...

AI Technical Summary

Problems solved by technology

[0003] Although the reliability of combined electrical appliances is strong, various faults emerge in endlessly with the continuous increase of usage. Due to the production, transportation, installation and operation of gas-insulated combined electrical appliances, high-voltage conductor protrusions, grounding shell protrusions, and insulators are generated. Insulation defects such as surface metal particles, air bubbles in the insulator, insulator cracks, free metal particles, and suspended electrodes; when the gas-insulated combined electrical appliance operates at rated voltage, partial discharges will occur at the insulation defects, which will cause continuous deterioration of the insulation system and eventually lead to equipment failure. Fault

Gas-insulated combined electrical appliances have a high voltage level and a large installation capacity. Once an accident occurs, it will affect the stable operation of the entire power system, causing huge economic losses and threatening the safety of workers.

[0004] Because the existing technology uses large-scale proprietary detection equipment for detection and because this partial discharge fault is very hidden and difficult to find when it first occurs, it cannot be detected by electrical measurement until an obvious discharge occurs

Images