Transformer partial discharge monitoring and evaluation system

Abstract

The invention relates to a transformer partial discharge monitoring and evaluation system. The system comprises a monitoring center, a monitoring control module, an anti-interference regulating system, a high frequency current sensor, a signal processing unit, a digital sampling module and a diagnosis unit, the monitoring center is provided with a master server, a human-computer interface, an industrial personal computer, a health assessment module and a health early-warning module, and the master server is connected with the human-computer interface, the industrial personal computer, the health assessment module, the health early-warning module and the monitoring control module located at the transformer end. By means of the system, on-line monitoring can be achieved, test time is short, damage to equipment caused by power failure is reduced, the adopted broadband type high frequency passive current sensor is high in pulse resolution ratio, frequency components of an original signal can be well reflected, and it is facilitated to sufficiently obtain partial discharge information and accurately extract partial discharge characteristics; the health assessment and health early-warning functions are achieved, and the working health state of a transformer can be evaluated through analysis processing on the data.

Description

technical field [0001] The invention relates to the technical field of electrical equipment monitoring, in particular to a transformer partial discharge monitoring and evaluation system. Background technique [0002] With the rapid development of the power industry as a whole to large power grids, large units, and high capacity, higher and higher technical requirements are put forward for the real-time control of the operating status of key electrical equipment. The partial discharge of the transformer will affect the insulation life. Each discharge, the impact of high-energy electrons or accelerated electrons, especially the long-term partial discharge will cause various forms of physical effects and chemical reactions. It may break the chemical bond of the insulation and cause cracking, destroy the molecular structure of the insulation, cause insulation deterioration, and accelerate the insulation damage process. Most of the faults of power transformers are caused by insu...

AI Technical Summary

Problems solved by technology

The partial discharge of the transformer will affect the insulation life. Each discharge, the impact of high-energy electrons or accelerated electrons, especially the long-term partial discharge will cause various forms of physical effects and chemical reactions. It may break the chemical bond of the insulation and cause cracking, destroy the molecular structure of the insulation, cause insulation deterioration, and accelerate the insulation damage process

Most of the faults of power transformers are caused by insulation failure, and the existing maintenance and insulation preventive test system has the following deficiencies: a. There are differences between test conditions and operating conditions, and the offline test cannot fully reflect the insulation status of the equipment under operating conditions ; b. Although insulation faults have a development process, the development speeds are quite different. Sudden faults account for a considerable proportion of ultra-high voltage transformer accidents; c. Regular maintenance and insulation preventive tests need to be carried out offline with power outages. long, heavy workload, and may cause equipment damage

The existing online monitoring system does not have health assessment and early warning functions, so that measures will be taken only when there is a problem

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