The Design Of Non-contact Electroscope Of Ultra-high Voltage Based On Field Intensity Distribution

Since ultra-high voltage transmission lines put into operation, it has gradually become the main part of the transmission line in China. To test its electricity has very important practical value.This paper analyzes the structure composition and detection principle of various electroscopes, based on the field intensity distribution of ultra-high voltage transmission line, a contactless inspection electric scheme is proposed. The test electric scheme adopts a differential field strength measuring method, with 24 high-accuracy AD7714 acquisition chip and low power consumption, multi-function with C8051F320 processing chip as the core, to measure the electric field intensity under super-high voltage transmission line. And the plan as the core, ultra-high voltage power transmission line field intensity measuring circuit is designed. The circuit realized the electric signal receiving, filtering and amplification, processing and sending function.Based on introducing the electroscope hardware, the electroscope software overall design thought is described. And electroscope as the core, with the use of C51 programming language, lower machine driver software is designed to realize with AD chip control, data collection, filtering, processing, and communication with the upper machine, and other functions.In the electroscope, on the basis of system hardware and software, to test the performance index of design system, for the main part of the system were tested, using simulation environment, to the function of the electroscope was tested. Finally, in a real environment, the system has carried on the abundant measured. The experimental results show that the electroscope can effectively detect ultra-high voltage transmission lines under the electric field intensity distribution, and correctly judge charged state.