Hydrogen sensor for detecting dissolved gas in oil

Abstract

The invention discloses a hydrogen sensor for detecting dissolved gas in oil. The hydrogen sensor comprises a hydrogen-sensitive chip, a conversion circuit, a heater, a temperature sensor, an adaptorand a sealing ring, wherein the hydrogen-sensitive chip is mounted at the front end of a phi-9.5 hydrogen concentration testing probe based on a solid-state catalysis palladium-nickel alloy film technique, the hydrogen concentration testing probe and the hydrogen-sensitive chip are directly dipped into oil in application and are deeply put into screw holes of oil filling equipment, one ends of thehydrogen concentration testing probe and the hydrogen-sensitive chip are connected with a signal conditioning unit through a signal transmission line, one end of the adaptor is connected with an oilsampling hole of the oil filling equipment, the other end of the adaptor is connected with a base, and the sealing ring is used for sealing the adaptor with the oil filling equipment. According to thehydrogen sensor, the sensor probe can be directly put into transformer oil, a movable part is not adopted, and the sensor structure is simplified, so that the maintenance cost is greatly lowered, andthe service life of the hydrogen sensor is prolonged. Compared with a traditional offline monitoring measure and a traditional online oil chromatography, the hydrogen sensor has the advantages that an oil-gas separation film is not adopted, the hydrogen is not consumed, the selectivity is high, and the like.

Description

technical field [0001] The invention belongs to the technical field of insulation state monitoring of oil-filled equipment in substations, and in particular relates to a hydrogen sensor for detecting dissolved gas in oil. Background technique [0002] Oil-filled equipment, such as transformer bushings, oil-immersed current transformers, voltage transformers, and oil-less circuit breakers, is one of the main equipment in the power system and plays a pivotal role in the power system. Failure or damage of oil-filled equipment will not only cause power outages, but also cause explosions or even fires in substation equipment, further expanding the scope of accidents. The safe and stable operation of oil-filled equipment directly affects the stability of the entire power grid, and the diagnosis and evaluation of its insulation state is of great significance. [0003] Both theory and practice have proved that hydrogen is the main characteristic gas for internal discharge (partial ...

AI Technical Summary

Problems solved by technology

The existing hydrogen sensors mainly use fuel cell gas sensors. The sensing principle is that the sensing part needs to undergo a chemical reaction, and the service life is limited, so it needs to be replaced regularly.

Most of the existing single hydrogen monitoring devices on the market currently have 2 h 2 and C 2 h 4 Cross-sensitivity of other gases, due to the higher volume fraction of CO in the transformer than H 2 , the sensor is cross-sensitive to CO so that it masks the H 2 Variations in concentration, thereby delaying the identification and diagnosis of equipment failures

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