On-line detection device of state of lightning arrester with series gap line

The utility model relates to an on-line detection device of a state of a lightning arrester with a series gap line and belongs to the on-line detection device of the lightning arrester with the series gap used for a power system transmission line. A lightning arrester motion current collector is connected in series in a line lightning arrester grounding wire. A lightning arrester motion power frequency current collector is connected to a data processor. A counting indicator is connected to the lightning arrester motion power frequency current collector and the data processor respectively. The data processor is connected to a fault alarm indicator. When an alarm threshold is reached or exceeded, state abnormity of the lightning arrester with the series gap line is alarmed. Therefore, state monitoring of the lightning arrester with the series gap line is realized. The device adopts a passive monitoring mode. The structure is simple. Lightning arrester state information is timely provided for operation and maintenance personnel and operation reliability of the lightning arrester with the gap line is increased.