Abstract
With the deregulation of the electrical power industry, utilities and service companies are operating in a changing business environment. High voltage circuit breakers are extremely important for the function of modern electric power supply systems. The need to predict the proper function of circuit breaker grew over the years as the transmission networks expanded. The maintenance of circuit breakers deserves special consideration because of their importance for routine switching and for protection of other equipments. Electric transmission system breakups and equipment destruction can occur if a circuit breaker fails to operate because of a lack of preventive maintenance. Dynamic Contact Resistance Measurement (DCRM) is known as an effective technique for assessing the condition of power circuit breakers contacts and operating mechanism. This paper gives a general review about DCRM. It discusses the practical case studies on use of DCRM for condition assessment of high voltage circuit breakers.
Highlights
A circuit breaker is an important equipment to power electric networks
High voltage circuit breakers are extremely important for the function of modern electric power supply systems
This paper gives a general review about Dynamic Contact Resistance Measurement (DCRM)
Summary
A circuit breaker is an important equipment to power electric networks. According to CIGRE report [1], more than 90 % of circuit breaker failures are due to mechanical causes. Circuit breakers are primarily mechanical devices that are performing an electric function. It is imperative to assure its proper operation. This is only possible by applying suitable maintenance. Testing and maintenance methodologies have changed over the years and in all likelihood will continue to evolve as new technologies become available. In POWERGRID, there have been failures of breakers due to damages in components in the interrupting chambers much before 10 years, that is, before carrying out the first major overhaul. Power Grid Corporation India Ltd. (PGCIL) started Dynamic Contact Resistance Measurement (DCRM) for diagnostic testing to decide for overhauling [2]
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