In order to reliably inspect the power of high voltage direct current（ HVDC） transmission lines

a direct current（ DC） electroscope system based on micro-electro-mechanical system（ MEMS） electric field sensor is proposed and designed. MEMS electric field sensor is used to measure the DC electric field. In order to realize acquisition and processing of electric field signal

a non-contact DC electroscope system using 32 bit embeded microcontroller as the core is designed. Early warning of the inspection result by sound and light warning module is realized

simplifies the operational complexity of the inspection operation. Application of this DC electroscope system can accurately detect the electrified state of the DC transmission lines and issues alter timely

with features such as simple operation

strong anti-interference

battery life up to 23 h.