GIS fast transient overvoltage optical online monitoring system

Abstract

The invention discloses a GIS rapid transient overvoltage optical online monitoring system, and belongs to the field of GIS transient overvoltage monitoring. The invention aims to solve the problem that the existing VFTO online monitoring device needs a working power supply and is easily interfered by a severe electromagnetic environment on a GIS (Gas Insulated Switchgear) site to cause poor equipment reliability. An induction electrode is arranged on the inner side of a hand hole cover plate on a GIS equipment shell, an optical voltage sensor is correspondingly arranged on the outer side, a high-voltage electrode of the optical voltage sensor is connected with the induction electrode, and a ground electrode is connected with a hand hole cover plate; the optical voltage sensor is used for sensing transient voltage loaded between the sensing electrode and the hand hole cover plate based on the Pockels electro-optical effect; a carrier optical signal of the LED light source is inputted to the optical voltage sensor through the optical fiber, the optical voltage sensor carries out electro-optical modulation on transient voltage to obtain a modulated optical signal, the modulated optical signal is transmitted to the photoelectric detector through the optical fiber to be subjected to photoelectric conversion, the converted electric signal is sampled and demodulated through the signal processing circuit, and a transient voltage monitoring sampling result is obtained. The system is high in anti-electromagnetic interference capability.

Description

technical field [0001] The invention relates to a GIS fast transient overvoltage optical on-line monitoring system, belonging to the field of GIS transient overvoltage monitoring. Background technique [0002] Gas Insulated Substation (GIS for short) is a high-voltage electrical appliance composed of isolating switches, circuit breakers, busbars, lightning arresters, current transformers and other high-voltage electrical appliances sealed in a grounded metal gas pipeline filled with SF6 gas. power distribution unit. When the isolating switch is disconnected or closed from the bus bar in the high-voltage power distribution device, due to the slow movement speed of the switch brake contact during the process of opening and closing, and the arc extinguishing performance of the switch is poor, the switch contacts during this process The head will re-ignite many times, causing a very fast transient over-voltage (Very Fast Transient Over-Voltage, referred to as VFTO). This will ...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem that the existing VFTO on-line monitoring device needs working power and is easily interfered by the harsh electromagnetic environment of the GIS site, resulting in poor reliability of the equipment, the present invention provides a GIS fast transient overvoltage optical on-line monitoring system

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