Lightning arrester with voltage monitoring interface

Abstract

The invention relates to a lightning arrester with a voltage monitoring interface. The lightning arrester comprises a base, voltage sharing covers, a shielding ring, silicone rubber umbrella skirts and wiring terminals, the silicone rubber umbrella skirts are connected with the top of the base by the shielding ring and are arranged at equal distance, the voltage sharing covers are fixedly arrangedat the tops of the silicone rubber umbrella skirts, each wiring terminal is connected with one side, far away from the base, of one end of each voltage sharing cover, a capacitance voltage sharing sleeve is connected with the bottom of each voltage sharing cover and is arranged in the silicone rubber umbrella skits, a valve is arranged at a position, near to the center of the voltage sharing cover, of one side of the capacitance voltage sharing sleeve, the voltage monitoring interface is connected with one side of the valve, penetrates through the capacitance voltage sharing sleeve and extends onto an outer wall of the silicone rubber umbrella skirt, a main capacitor and a voltage division capacitor are connected with one end of the voltage monitoring interface and extend to the capacitance voltage division sleeve, and the voltage monitoring interface and the capacitance voltage sleeve are fixedly connected by a sleeve flange. A true and effective voltage signal is provided, a voltageinterface is provided for local discharging monitoring and overvoltage monitoring, voltage division protection is improved, and the safety can be improved.

Description

technical field [0001] The invention relates to the technical field of high-voltage power transmission and transformation and power distribution equipment, in particular to a lightning arrester with a voltage monitoring interface. Background technique [0002] In the actual operation of various electrical equipment, insulation weaknesses will appear due to overvoltage and other reasons, and will gradually develop into insulation failures. When the insulation weak point appears, the first reaction is the increase of partial discharge. When the weak point expands to form an insulation fault, insulation flashover or insulation breakdown occurs. [0003] A key technology of modern smart grid construction is to establish an insulation monitoring and diagnosis system for electrical equipment, and partial discharge monitoring and overvoltage monitoring are the two most effective means. In these monitoring, taking the monitoring signal from the secondary side of the traditional ele...

AI Technical Summary

Problems solved by technology

In these monitoring, taking the monitoring signal from the secondary side of the traditional electromagnetic voltage transformer cannot meet the requirements, and an electronic voltage sensor must be installed to provide the monitoring signal

However, due to the limitation of space in the switch cabinet or substation, it is very difficult to install these sensors. The existing electronic voltage sensor technology also has problems of operational reliability, large interference signals and inconvenient installation.

10-35kV system capacitive sensors are generally assembled with thin-film capacitors, and the failure rate is relatively high; 110kV and above systems do not have dedicated electronic sensors, and generally use the existing CVT secondary side or bushing end screen to provide signals, and the signal interference is large , the bandwidth response is not enough

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