SF₆ gas is widely used in high voltage equipment because of its excellent arc extinguishing performance and high electric resistance.At present, 80% of the domestic production of SF₆ gas is used in the power industry, especially in the 110kV and above voltage level of power equipment, SF₆ gas plays a crucial role.Operating mechanism is the power part of SF₆ circuit breaker opening and closing operation, and directly controls the opening and closing operation of circuit breaker. Its reliable operation is very important for the correct operation of circuit breaker.In extremely cold environment, spring operating mechanism may occur short-circuit between coil turns, coil core card, open and close brake card, coil loop contact bad faults;The hydraulic spring operating mechanism may have the defects of transmission rod sticking, short circuit between coils, bad contact between coils, insufficient energy storage caused by the poor sealing of the main valve and the oil cylinder, which affect the operation of the operating mechanism.Based on this, this paper builds a circuit breaker operating mechanism under the condition of cold simulation test platform, the circuit breaker hydraulic spring operating mechanism in cold region simulation test, study the mechanical characteristic of the high voltage circuit breaker and the relationship between the environmental temperature, to obtain operating mechanism points switching curve is the key feature of the mechanical properties such as affected by temperature. The indexes and methods for evaluating the on-off characteristics of high voltage circuit breaker under low temperature are proposed.

Jian Zhang, Peng Zhang, Mingchen Gong, Lei Wang, Heqian Liu, Hongda Yang, Kexin Zhang, Zhongyuan Li. Research on Mechanical Characteristics of Circuit Breaker Operating Mechanism under Extreme Cold Condition. International Journal of Frontiers in Engineering Technology (2023), Vol. 5, Issue 10: 70-76. https://doi.org/10.25236/IJFET.2023.051011.

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