Temperature measurement of high-voltage switchgear busbar

The necessity of installing a temperature monitoring system for high-voltage switchgear

During the long-term operation of switchgear, the high-voltage switch contacts, busbar overlap points, and other parts in the switchgear often have excessive contact resistance due to improper installation or aging, resulting in abnormal temperature in the main circuit. If this change is not known in a timely manner and continues to operate, it will further intensify heating and oxidation, and create a vicious cycle, leading to phenomena such as melting and falling off of the contact finger, burning of the contact head, and deterioration of adjacent insulation materials. Finally, it may even catch fire, causing accidents, and even serious accidents such as breakdown and explosion. For a long time, due to the high potential environment of the main circuit of high-voltage switchgear (mainly referring to the contact arms, contacts, and busbars), various problems such as high-voltage insulation and electrical isolation under high and low potential cannot be solved under direct measurement conditions, making online monitoring of circuit breaker temperature a difficult problem.

Characteristics of Fiber Optic Temperature Online Monitoring System for High Voltage Switch Cabinet Busbars

(1) The fiber optic temperature measurement device of the busbar has strong resistance to strong electromagnetic interference inside the switchgear;

(2) The fiber optic temperature measurement system has a sufficiently short reaction time, which determines that the hardware and software used in the system design have relatively fast operating speeds;

(3) Maintain the normal operation and performance of the switchgear during online monitoring.

The online monitoring system for fluorescent fiber optic temperature measurement of switchgear, the high-voltage busbar contact temperature measurement system, and the busbar contact components are equipped with temperature sensors. The fluorescent fiber optic temperature sensor is connected to the temperature controller to achieve the purpose of monitoring the temperature of the switchgear busbar.

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