Method and system for detecting concentration of gas in insulating oil of transformer

Abstract

The invention discloses a method and system for detecting the concentration of gas in insulating oil of a transformer. The method comprises the steps that the detected gas selectively enters hollow-core photonic bandgap-photonic crystal fibers; a laser light source emits a laser into the hollow-core photonic bandgap-photonic crystal fibers to obtain signal light, and an erbium-doped fiber amplifier amplifies the signal light; and a semiconductor photodetector receives the amplified signal light, and an analysis system calculates the gas concentration according to the amplified signal light andtransmits the gas concentration to a monitoring terminal. The fibers are wide in working frequency band, large in action range and high in sensitivity and are an excellent sensitive element; the fibers are provided with excellent low-loss transmission lines and are suitable for remote control; and the fibers are a passive device, fiber materials have the good electrical insulation property, is low in environmental dependence and can be used under the situations of strong electromagnetic interference, a radiation environment and the like. According to the method and the system, the fault typeand the aging degree of the electric power transformer can be accurately detected on line, and the method and the system are of great significance to maintain long-term stable operation of an electricpower system.

Description

technical field [0001] The application relates to the technical field of on-line monitoring and fault diagnosis of electrical equipment insulation, in particular to a method and system for detecting gas concentration in transformer insulating oil. Background technique [0002] The power transformer is the most important electrical equipment in the power system. At present, the domestic power system mainly adopts the oil-immersed power transformer. Its safe and reliable operation is an important guarantee to ensure the power conversion of the power transmission and distribution process. The fault and aging state of the transformer can be diagnosed online in real time. Provide reference for efficient maintenance of equipment. It is of great significance to maintain the long-term stable operation of the power system to accurately detect the fault type and aging degree of the power transformer online. [0003] At present, the main methods for detecting dissolved characteristic ...

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Problems solved by technology

[0004] The purpose of this application is to provide a method and system for detecting the gas concentration in the transformer insulating oil to solve the problem that the accuracy of the existing spectrum method for detecting the gas concentration in the transformer insulating oil is not high

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