Portable SF6 gas resolvent photoacoustic spectrum detecting device and method

Abstract

The invention relates to a portable SF6 gas resolvent photoacoustic spectrum detecting device and method which have the advantages of being high in sensitivity, capable of automatically achieving detection and concentration conversion, fast in detection speed, high in accuracy, easy to carry and suitable for online monitoring. A paraboloid column mirror is arranged in a casing, and an infrared source is arranged on the paraboloid column mirror. A chopper, an optical filter wheel and a photoacoustic cell are arranged in front of the paraboloid column mirror, and a plurality of optical filters are evenly distributed on the optical filter wheel along the circumferential direction. The photoacoustic cell comprises a microtone device, an air pressure sensor and a temperature sensor and connected with an air pipe and a vacuum pipeline which is connected with a vacuum pump. The chopper is connected with a chopper controller, the optical filter wheel is connected with a singlechip microcomputer, the microtone device is connected with a phase-locking amplification module, the air pressure sensor is connected with the singlechip microcomputer, the temperature sensor is connected with an analog / digital (A / D) converter which is connected with the phase-locking amplification module, and the singlechip microcomputer is further connected with a liquid crystal driving and display screen and a working power source.

Description

technical field [0001] The present invention belongs to sulfur hexafluoride (SF 6 ) Technical field of state detection of gas-insulated metal-enclosed electrical equipment, specifically related to portable SF 6 Gas decomposition product photoacoustic spectrum detection device and detection method. Background technique [0002] SF 6 Gas-insulated metal-enclosed electrical equipment (GIS) has the advantages of high insulation strength, safe and stable operation, environmental protection, long maintenance cycle, small footprint and small maintenance workload. It is used in power systems, especially in large and medium-sized cities. Widely used in network construction and transformation. However, judging from the operation situation in recent years, there have been many problems in the operation of GIS at home and abroad, mainly due to the failure caused by the inevitable internal defects. Once a failure occurs, the closed structure of GIS makes the diagnosis and maintenance ...

AI Technical Summary

Problems solved by technology

The main disadvantage of this patent is that the infrared photoacoustic spectroscopy detection device it adopts can only detect SF 6 The type and content of gas partial discharge decomposition components are detected offline, and the SF generated by partial discharge in the GIS simulation component is collected by using a gas collection bag 6 Decompose the gas, and then pass it into the photoacoustic spectrum detection device for detection. There are three problems in this device: 1. The device can only collect gas through the gas collection bag, and then inject it into the photoacoustic spectrum detection device. Since the gas collection bag The tightness, collection process and storage time will all have an impact on the concentration of the decomposed components, so the accuracy of the detection cannot be guaranteed; 2. The device is bulky and consists of multiple (broad-spectrum infrared light source, zinc selenide lens, chopper , chopper controller, filter wheel, filter, zinc selenide window, photoacoustic cell, optical bracket, lock-in amplifier and computer, etc.) are composed of separated components, which is inconvenient to use on site; 3. Detection method In the process, there are many manual operations, and the reading must pass through the oscilloscope, which is not convenient for automatic detection on site

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