Safety detection method for excitation carbon brush of generator and early warning system

Abstract

The invention relates to the technical field of safety detection for an excitation carbon brush of a generator, and discloses a safety detection method for an excitation carbon brush of a generator. The safety detection method realizes accurate analysis and early warning of a monitoring target in real time, eliminates the shortcomings of dead angles, no tracking analysis, low accuracy, gap measurement and high labor intensity of the original detection method, enables the potential safety hazards of the excitation carbon brush of the generator to obtain comprehensive and early warning, and provides a reliable underlying data foundation for the realization of a smart power plant. According to the invention, infrared thermography is successfully applied to the excitation carbon brush monitoring of the generator, the carbon brush area is drawn on a thermal image video by applying a computer technology, a unique corresponding relation is formed between the carbon brush area and the positionof a physical carbon brush, and non-contact intelligent detection is carried out on the carbon brush, so that the stable operation monitoring capability of a generator excitation system is improved,and the accident early warning capability, the analysis level and the response efficiency of the power plant are facilitated to be improved.

Description

technical field [0001] The invention relates to the technical field of safety detection of excitation carbon brushes of generators, in particular to a method for safety detection of excitation carbon brushes of generators and an early warning system. Background technique [0002] With the expansion of the power system scale, the emergence of long-distance heavy-duty transmission lines and the use of large generators, the fast excitation system composed of semiconductor excitation regulators and thyristor rectifier power cabinets has continuously weakened the damping of the entire power system. When the power system fails or is disturbed by other disturbances, there will be long-term low-frequency oscillation, and the failure of the excitation system of the generator will increase. a great risk. How to take effective measures to improve the stable operation of the excitation system has become an urgent problem to be solved in the power system. [0003] During the operation ...

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Problems solved by technology

In order to reduce the failure rate of the excitation system, the components of the excitation system are usually set in a closed space, so that the staff cannot monitor and understand the internal situation comprehensively and in real time, and cannot grasp the deterioration of the components of the excitation system in time, and often miss the time to deal with safety abnormalities Optimum timing leads to accidents

[0004] At present, the DCS system, electrical monitoring system or PMU device has no online monitoring function for the carbon brush temperature of the excitation system of the power plant, the temperature, humidity and dust of the power cabinet, the iron core of the excitation transformer and the temperature of the cable joint, and there is no means to directly measure it. The parameters of the stable operation of generator excitation carbon brushes and other components, this patent aims to introduce a sensor with thermal infrared temperature imaging unit and dust and humidity monitoring functions at the same time, which is used for online monitoring of generator excitation and its carbon brush temperature, dust, Humidity, and its online analysis, management, early warning

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