Electric service life monitor system for contact of breaker

Abstract

An electric service life monitoring system for the contact of breaker is composed of up-position unit (industrial control computer), down-position unit consisting of multiple sampling cards, and dual-port RAM connected between them. Each signal sampling card is composed of signal sampling circuit, protecting circuit, multi-channel switch, emitter follower, precise rectifier, A / D converter and CPU.

Description

technical field [0001] The invention relates to a circuit breaker contact electrical life monitoring system, which belongs to the online monitoring of the circuit breaker electrical life, that is, a monitoring system for circuit breaker condition maintenance service. Background technique [0002] The implementation of on-line monitoring of circuit breaker electrical life has great significance and great economic benefits for circuit breaker condition maintenance, but the electrical life of circuit breaker is a very complicated issue. The development of modernization has higher and higher requirements for power supply reliability and power supply quality. Modern large-scale power grids are large systems connected by a large number of power transmission, transmission, transmission and distribution equipment. The reliability and performance of these power equipment directly Determine the reliability and quality of power supply. We know that the number of circuit breakers in th...

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Problems solved by technology

In the past ten years, many domestic scientific research institutes and manufacturers have made great efforts to develop a device that can record the cumulative breaking current and the cumulative breaking times to scientifically determine the maintenance cycle of the circuit breaker. A variety of instruments have been developed. For example, at the beginning of 1982, the Suzhou Switch Factory and the Electric Power Research Institute of the Ministry of Water and Electricity jointly developed the DJY-1 short-circuit current recorder, which divides the current into nine grades according to the size, and records the cumulative breaking times according to the current grade; In 1993, the KG type circuit breaker breaking current recorder jointly developed by the Space Center of the Chinese Academy of Sciences and Beijing Huayou Industrial Co., Ltd. of the All-China Federation of Returned Overseas Chinese can read the total current of each phase and each breaking time of the circuit breaker at any time. And the current value of the last 100 times; at present, according to domestic and foreign research and tests, we believe that: from the perspective of accumulated electrical wear, when other conditions are constant, the electrical wear of the circuit breaker is mainly determined by the arc energy, and the circuit breaker is used to record The accumulative breaking current or arc energy (I 2 t) It is reasonable to reflect the electrical life of the circuit breaker. However, the electrical wear of the circuit breaker is not proportional to the arc energy or the breaking current. Life is not scientific and intuitive; in addition, the relationship between electrical wear, arc energy and cumulative breaking current of different circuit breakers is obviously different, so the above recording method is too simple

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