A high-voltage circuit breaker plum blossom contact aging diagnosis method

Abstract

The invention discloses a method for diagnosing the aging of the plum blossom contact of a high-voltage circuit breaker. According to the temperature value and current value obtained in real time by the temperature sensor and the current transformer on the contact, the diagnosis method can obtain the temperature change rate of the plum blossom contact, and based on the The temperature change rate realizes real-time diagnosis of the aging degree of the plum blossom contact. After adopting the above scheme, the aging degree of the plum blossom contact and whether the equipment is abnormal can be determined in real time, providing a data basis for equipment maintenance. This diagnostic method is low in cost and high in accuracy; the switch The transmission of data based on wireless transmission inside the cabinet can effectively solve the problem of high potential isolation, and the wireless transmission control based on temperature data can reduce the energy consumption of the circuit board, ensuring that the diagnosis method is stable and feasible.

Description

technical field [0001] The invention belongs to the technical field of aging diagnosis of components of high-voltage circuit breakers, and in particular relates to a method for diagnosing the aging of plum blossom contacts of high-voltage circuit breakers based on online temperature detection. Background technique [0002] As one of the important equipment in the power system, the reliability of the high-voltage circuit breaker directly affects the safety and stability of the power grid operation. Static contacts and moving contacts are a group of basic components in high-voltage circuit breakers. When the static contacts and moving contacts are in contact, there is a contact resistance between them. When the current flows through the contacts, the current will flow due to the existence of contact resistance. It causes heating of the contacts. As a result of heating, the contact between the dynamic and static contacts may be oxidized. The oxidation of the contact points will...

AI Technical Summary

Problems solved by technology

In addition, during the long-term operation of the handcart-type high-voltage switchgear, the connection between the plum blossom contact of the vacuum circuit breaker in the switchgear and the static contact of the cabinet will heat up due to aging or excessive contact resistance. It directly affects the safe and stable operation of the equipment. This phenomenon has become a common problem in the use of switch cabinets. If it is not controlled, as the overheating continues to accumulate, it may even cause fires or large-scale power outages. Therefore, it is necessary to check the plum blossom contacts in time. The aging degree of contact points of the head and the static contact to determine whether to deal with the high-voltage circuit breaker

Due to the airtightness of the switch cabinet, it is not easy to detect the aging degree of the contact point of the plum blossom contact. Moreover, the overheating of the contact point is a continuous process, and the change of the contact resistance is slow. If the current regular off-line maintenance is adopted, there will be blindness. However, the inspection process will affect the normal operation of the power system. The actual operation of high-voltage circuit breakers does not allow these gradual faults to be identified by directly measuring the size of the contact resistance. The existing plum blossom contact aging diagnosis The method needs to be improved

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