High-frequency current method composite electric field power cable middle interface partial discharge detecting system

Abstract

The invention belongs to the power equipment detection technology. In order to achieve diagnosing and identifying of partial discharge of silicone rubber under a composite electric field by using thehigh-frequency current transformer partial discharge detection technology, the high-frequency current method composite electric field power cable middle interface partial discharge detecting system iscomposed of a composite electric field partial discharge device, a high frequency current signal acquisition unit, a data transmission unit and a data processing unit; the composite electric field partial discharge device comprises a high voltage direct current power source, a pulse power source, a voltage composite unit and an analog partial discharge device; the output ends of the high voltagedirect current power source and the pulse power source are connected to the input end of the voltage composite unit; the analog partial discharge device is composed of a pin plate type electrode and asilicone rubber sample; and signals collected by the high frequency current signal acquisition unit are transmitted to the data processing unit through the data transmission unit to be processed andthen output. The high-frequency current method composite electric field power cable middle interface partial discharge detecting system is mainly applied to the design and manufacturing occasions of apower equipment detection device.

Description

technical field [0001] The invention relates to cables and power equipment, in particular to a partial discharge detection system for intermediate joints of power cables with high-frequency current method compound electric field. Background technique [0002] At present, silicone rubber prefabricated intermediate joints have been widely used in transmission lines and distribution networks. According to relevant statistics, as of the end of 2010, the total length of my country's cable lines has been extended by about 27% compared with the total length of cables ten years ago. With the increasing use of cable elongation intermediate joints, silicone rubber is widely used in prefabricated intermediate joints due to its good insulation and mechanical properties. Since the prefabricated intermediate joint is a multi-layer solid composite dielectric insulation structure, the insulation structure is compact and needs to be installed and formed under on-site conditions. There are m...

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Problems solved by technology

However, at this stage, the research on the test and diagnosis technology of partial discharge under the compound electric field is still in its infancy at home and abroad.

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