Extra-high voltage alternating current non-contact multi-channel electricity testing method

Abstract

The invention provides an extra-high voltage alternating current non-contact multi-channel electricity testing method. The method comprises self-checking, pre-checking, multi-channel checking, comparison and alarming stages and the following steps of: after self-checking is passed and time delay is performed, performing detection by using a parallel plate capacitance sensing principle and double channels; acquiring data of a horizontal channel and a vertical channel at a certain frequency; comparing the electric intensity values of the working positions of tested objects acquired from the two channels; taking a larger current intensity value as an electricity testing value; putting the tested objects at lower positions to measure the current intensity values of the two passages by the same method; taking a larger current intensity value as an alarm threshold; testing electricity according to the field intensity curve and variation trend of a space electric field; and reflecting the magnitude of an electric field through sound and light alarm signals. The method can effectively eliminate the disturbance of neighboring electrified equipment and solves the problems of poor repeatability and low correctness of an electricity testing result caused by the strong disturbance of an electrified body adjacent to tested equipment on space field intensity.

Description

technical field [0001] The invention belongs to the field of research methods of safety tools for UHV AC power transmission and transformation equipment, and in particular relates to a UHV AC non-contact multi-channel electric inspection method. Background technique [0002] Operation and maintenance work is an important means to grasp the operation status of power grid equipment, discover and deal with equipment defects in time. The "State Grid Corporation Electricity Safety Work Regulations (Power Line Part)" clearly stipulates that before working on some electrical equipment that is powered off or installing grounding wires in the working section of a power outage line, an electrical test must be performed to verify that the equipment or lines are indeed without voltage. The electroscope is one of the common tools used to detect whether there is voltage on the electric equipment. Through the electroscope, it can be clearly verified whether there is no voltage on the equip...

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Problems solved by technology

[0003] In the Chinese patent 200910060796.9 "1000kv UHV AC non-contact electric inspection method and its electroscope", the electric inspection reference value is obtained by the data processing module at a certain frequency to collect data from the electric field strength of this working position, and the alarm threshold is obtained by multiple on-site The test is reasonably selected according to the changing trend of the electric field. Since there are many live equipment in the substation and the converter station, the interference between the live equipment is relatively large, resulting in complex and changeable synthetic field strength around the live equipment. Large interference, so the acquisition of the electric test reference value and alarm threshold in this patent is easily affected by external interference, and the accuracy is not high

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