Sulfur hexafluoride gaseous discharge micro component infrared detection device and method

Abstract

A sulfur hexafluoride gaseous discharge micro component infrared detection device and method relates to a sulfur hexafluoride gaseous infrared absorption spectrum analysis device and method. The device of the invention mainly comprises an induction voltage regulator, a corona free experimental transformer, a non local discharge protective resistor, a standard capacitance voltage divider, a GIS analogue element, a non inductive resistance, a Fourier transform infrared spectrometer and a wideband high speed super capacity digital storage oscilloscope; wherein the gas tank in the Fourier transform infrared spectrometer is a long optical distance one. The method of the invention includes that discharge micro component detection is carried out on SF6 gas sample in GIS by utilizing the device ofthe invention. The invention can accurately detect various products produced by gas discharge decomposition of SF6 and has the characteristics of high detection precision, high spectrum resolution, good absorption peak symmetry, high signal to noise ratio and the like. The invention can be widely applicable to GIS equipment online running local discharge and provides reliable data for GIS equipment online running state analysis.

Description

technical field [0001] The invention belongs to the technical field of gas infrared absorption spectrum analysis, in particular to sulfur hexafluoride (SF 6 ) Gas infrared absorption spectroscopic analysis device and method. Background technique [0002] Gas insulated switchgear (GIS), with sulfur hexafluoride (SF 6 ) gas as an insulating medium has the advantages of high dielectric strength, stable operation, small footprint and small maintenance workload. It is more and more widely used in power systems, especially in the construction and transformation of large and medium-sized cities. However, judging from the operating conditions in recent years, many problems have occurred in the use of GIS at home and abroad, among which insulation faults are the main ones. The most common feature of insulation faults is that the insulating medium in GIS has localized faults before complete breakdown. Discharge (PD). Under the action of discharge, SF 6 The gas decomposes, and the ...

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Problems solved by technology

However, since SF in GIS 6 When the gas is partially discharged, the concentration of the decomposition product is very low, which is on the order of μL / L. In addition, the infrared light source is generally weak and the sensitivity of the infrared detector is low, which makes the detection of trace gas components very difficult.

The gas cell of the existing Fourier transform infrared detection spectrometer such as the 0.1-meter short-path gas cell produced by Tianjin Tianguang Optical Instrument Co., Ltd., such as figure 1 As shown, the short optical path gas cell has a simple structure, mainly composed of a cylindrical glass outer wall, two windows, an air inlet glass valve, and an air outlet glass valve. Path length measures, the effective optical path length is only 0.1 meters, such as figure 2 As shown, using this short pathlength gas cell for 100μL / L SO 2 Standard gas, 22μL / L SO 2 f 2 The spectrogram obtained by standard gas detection has low resolution, low signal-to-noise ratio, low detection limit, and low precision. Only rough qualitative analysis can be performed, and quantitative analysis cannot be performed.

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