In order to better understand the power frequency electric field around the transmission lines and device, this study introduces the mathematical measuring principle of one-dimensional spherical sensor for electric field, analysis the theoretical feasibility whether the ball-type sensors could be replaced by the parallel plate capacitive sensor and discuss the effects of different sizes of parallel plate capacitive sensor for electric field measurements and then complete the design of sensor.

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... e design of overall system and operating principle of the safety warning instrument are introduced and the relevant hardware and software circuit design are completed. After debugging, a high voltage electric field measuring based on the C8051F410 microcontroller is designed. In the 750kV substation and transmission line space below, the measured data have greater relevance with good usability after comparing the foreign standards and the instruments designed.