Capacitor type ring network cable partial discharge sensor

Abstract

The invention provides a capacitor type ring network cable partial discharge sensor which mainly comprises: a titanium alloy made flat plate which wraps and coats the protection sheath of a ring network cable, and together with the steel armor inside the ring network cable, forms a flat plate capacitor and couples high frequency signals generated by cable partial discharge; an insulation plate which is connected to the titanium alloy made flat plate and wraps and coats the titanium alloy made flat plate so as to resist interference of exterior environment to the coupled high frequency signals; a high frequency wave filter circuit mounted to filter unnecessary waves; a metal box mounted on the high frequency wave filter circuit to prevent water and dust corrosion so that the circuit is not ruined by exterior environment and a TNC joint used to receive partial discharge high frequency signals after the wave filtering process. The capacitor type ring network cable partial discharge sensor is provided with a flat plate capacitor formed from a titanium alloy made square plate wrapping and coating the protection sheath of the ring network cable and the steel armor inside the ring network cable to couple high frequency signals generated in the partial discharge of the cable. The insulation plate separates exterior interference on the high frequency signals. The wave filter circuit in the metal box filters clutters and the TNC joint draws high frequency signals out of the metal box.

Description

technical field [0001] The invention relates to the field of electrical equipment detection instruments, in particular to a capacitive ring network cable partial discharge sensor. Background technique [0002] Among cable accessories, cable terminals and intermediate joints are the most prone to partial discharge failures. Unqualified workmanship and unskilled construction and installation personnel may lead to hidden dangers in cable accessories, inducing partial discharge failures and breakdown failures. Once a cable accident occurs, it will affect people's lives and cause economic losses to the country, enterprises and individuals. [0003] Partial discharge detection has always been the main item of non-destructive electrical inspection of cable insulation, and it is increasingly regarded as the most effective method of insulation diagnosis. The purpose is to observe and study the insulation aging problem caused by partial discharge. [0004] Domestic and foreign operat...

AI Technical Summary

Problems solved by technology

The defect of the current monitoring method is that the detection device has a delay, and the anti-interference ability to external signals is weak

In addition, since the partial discharge occurs at the local defect of the insulation, the initial discharge amount is very small, so it will not affect the insulation capacity, so it is easily overlooked

However, partial discharge will slowly damage the insulation under the long-term voltage of the insulation, thereby shortening the service life of the insulation.

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