In view of the weak anti-interference ability,low adaptability,poor alarm effect and the edge effect in the symmetrical structure of the traditional flat capacitive sensor,an anti-breakage device for multi-configuration and multi- voltage level overhead transmission lines is developed.Firstly,this paper analyzes the relationship between induced voltage and field strength,improves the structure of equal potential belt and completes the PCB design,the multi- configuration and multi-voltage level overhead transmission line simulation model is built by using Ansys Maxwell to provide theoretical basis for alarm threshold setting;secondly,the hardware and software design of the anti-breakage device is completed to realize the functions of voltage level selection,electric field signal acquisition and processing,and sound and light alarm under different line conditions;finally,a 10 kV simulated overhead transmission line high-voltage experimental environment is built and field verification is carried out to test and analyze the working performance of the device.The results show that the average relative error of the anti-breakage device's inductive voltage measurement is within 3%,the linear correlation coefficient with the test voltage is R=0.9997,and it's change law is in accordance with the electric field distribution law;live alarm success rate is 100%,the device is stable and reliable,taking into account the accuracy and linearity requirements.