Fault current limiter and metal oxide varistor (MOV) wireless temperature measuring device applied to fault current limiter

Abstract

The invention relates to a fault current limiter and a metal oxide varistor (MOV) wireless temperature measuring device applied to the fault current limiter. The temperature measuring device comprises an online monitoring working station, a wireless receiving unit, an acquisition and wireless transmitting unit, a current transformer and a plurality of temperature measuring probes, wherein the temperature measuring probes are connected with the acquisition and wireless transmitting unit; the current transformer is connected with the acquisition and wireless transmitting unit; the acquisition and wireless transmitting unit is in communication connection with the wireless receiving unit; and the wireless receiving unit is connected with the online monitoring working station. The fault current limiter comprises a metal oxide voltage limiter, and a plurality of straight channels are formed on a ZnO valve plate of a radiating conducing ring of the fault current limiter; the temperature measuring probes are embedded in the straight channels, and are closely attached to the ZnO valve plate; and the current transformer is connected with a high-voltage platform of the fault current limiter. The fault current limiter has a long transmission distance and a large number of temperature measuring nodes, is strong in interference resistance, and can be used for accurately monitoring the temperature of an MOV body valve plate in real time.

Description

Technical field [0001] The invention relates to a wireless temperature measuring device, in particular to an on-line monitoring of the temperature of a MOV body applied to the short-circuit fault current limitation of a power system. Background technique [0002] With the continuous expansion of the transmission capacity of the power system, the short-circuit current level of the power grid is also increasing. Limiting the short-circuit current has become an unavoidable major technical and economic problem in the development of modern power grids. The series resonance economic fault current limiter based on the metal oxide voltage limiter MOV can not only limit the short-circuit current to a lower level, but also has high operational reliability, automatic switching without additional control, low price and technology Obvious advantages such as good economic performance have been applied in high-voltage power grids. [0003] The large-capacity metal oxide voltage limiter MOV is a ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a fault current limiter and an MOV real-time online wireless temperature measuring device applied to the fault current limiter, so that it can solve the power supply of MOV temperature acquisition and wireless transmission unit in high electric field applications Energy harvesting problems, anti-interference problems of devices in strong electromagnetic environments, difficult monitoring of operating temperature, and insulation problems of secondary signal transmission cables on high-voltage platforms

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