Research On Non-contact Electroscope Based On Electromagnetic Induction Principle

Electroscope as power industry field indispensable safety instruments,to test equipment whether there really was no voltage,is an important means to protect the safety of maintenance personnel assignment,presupposition of executed correctly pour brake operational personnel.Traditional contact check electrical technology has developed more mature,with the increase of voltage grade,transmission line distance the distance of the ground is becoming more and more high,need to direct contact with the way of test electric has exposed its defects.Therefore,the study of non-contact inspection techniques can not only save the workload of inspection,but also better protect the personal safety of operators,and reduce the risk of direct contact with charged equipment.It is a technology worthy of research and promotion.In this paper,the electromagnetic environment around the transmission lines are analyzed,and the charge simulation method is adopted to simplify and transmission lines set up the mathematical model of transmission line,the simulation calculation,by comparing the different location of the electric field intensity curve,studies the distribution of electric field around transmission lines.According to the characteristics of transmission line field intensity distribution,a method to realize indirect electroscope is explored,and a spherical sensor is developed to measure the intensity of electric field.The linear relationship between the output voltage signal of the sensor and the intensity of the space electric field is verified by theoretical analysis and actual calibration of the spherical sensor.Based on the electric field sensor,the single-chip microcomputer is used as a processor to filter,amplify,and A/D convert the output voltage signal of the sensor,and the signal is operated to perform an indirect inspection function.At the same time,the results of the inspection will be displayed through sound and light alarms and LCD to inform the user.The test was carried out on the lower part of the transmission line,and the measuring environment was divided into non-interference,unilateral interference and bilateral interference.The test results show that the device can reliably inspect and eliminate interference in a certain area of electrical examination,and can be used in actual inspection work.