Online monitoring device and system for lightning arrester

Abstract

The embodiment of the invention discloses an online monitoring device and system for a lightning arrester. The on-line monitoring device comprises an opening current transformer, a control circuit and a radio frequency communication circuit, the opening current transformer is arranged on a grounding wire of the lightning arrester, the control circuit is electrically connected with the opening current transformer and the radio frequency communication circuit, and further, the control circuit judges whether the lightning arrester has a fault or not and determines the lightning stroke frequency of the lightning arrester according to a current signal on the grounding wire acquired by the open current transformer, and sends the current signal, a fault judgment result and the determined lightning stroke frequency to a host through the radio frequency communication circuit. The lightning arrester on-line monitoring device provided by the embodiment of the invention is a passive and wireless lightning arrester on-line monitoring device, the size is small, installation is convenient, the wireless communication cost is low, and the practicability is higher.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of lightning arresters, in particular to an online monitoring device and system for lightning arresters. Background technique [0002] Surge arrester is an electrical appliance used to protect electrical equipment from high transient overvoltage hazards, and is an important protection device in the power grid. The online monitoring equipment of the arrester is to monitor the health status of the arrester in operation by monitoring the change of the leakage current of the arrester. [0003] At present, most of the on-line monitoring equipment of arresters are non-independent wired on-line monitoring equipment, such as "three to one" wired on-line monitoring equipment, which must be configured in the three-phase AC system when monitoring the leakage current of the arrester in the three-phase AC system. The three current transformers in the system all work with the host at the same time, ...

AI Technical Summary

Problems solved by technology

[0003] At present, most of the on-line monitoring equipment of arresters are non-independent wired on-line monitoring equipment, such as "three to one" wired on-line monitoring equipment, which must be configured in the three-phase AC system when monitoring the leakage current of the arrester in the three-phase AC system. The three current transformers in the machine work at the same time as the host, which is not only difficult to achieve miniaturization but also difficult to install.

Images