Sunkwang Lightning Protection Technical Institute Inc.

Byeong-U Kim

Dong-Jin Kim

Yong-Su Kim

Dong-hyun Kim

Sang-Won Seo

Wan-Seong Kwon

Jong-Yeon Kim

Dong-Min Kim

Hee-Soo Park

Jae-Hyo Park

Kyung-Hoon Jang

Won-Sung Kwon

Kwang-Yeop Jang

An apparatus for estimating the lifetime of a surge protective device (SPD) using the discharge characteristics of a metal oxide varistor (MOV) includes an MOV having an input terminal and an output terminal; an impulse voltage application unit applying an impulse voltage for MOV test to the input terminal of the MOV; a discharge current measurement unit; a first switching unit connecting a power line to the input terminal of the MOV; a second switching unit connecting a ground line to the output terminal of the MOV in the normal mode and selectively connecting the discharge current measurement unit in the MOV test mode; an MOV test management unit providing information; a discharge current check unit generating an MOV abnormal signal; and an MOV state display unit displaying an MOV abnormal signal.

Apparatus for estimating lifetime of the SPD using discharge characteristics of the MOV

A ground electrode () positioned in the earth and a monitoring device () configured to measure a current and resistance of a ground line, where the monitoring device () includes a ground current sensing unit () configured to measure the current of the ground line, a resistance sensing unit () configured to measure ground resistance of the earth and an earth resistance rate, a voltage sensing unit () configured to check a voltage value of commercial power, a temperature and humidity sensing unit () configured to check a surrounding temperature and humidity of the monitoring device (), and a monitoring unit () configured to confirm whether the ground current, ground resistance and earth resistance measured are abnormal values by compared with reference values classified based on the temperature and humidity measured.

System for monitoring resistance and current in ground line

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Seoul, South Korea

Byeong-U Kim