This parameter is not explicitly specified in foreign standards. At the end of 1989, the Electric Power Department of the Ministry of Energy proposed that the closing bounce time of vacuum circuit breakers must be less than 2ms. Why is the closing bounce time less than 2ms? The main reason is that the moment of closing and bouncing can cause the power system or equipment to produce L High frequency oscillation of C may cause damage or even damage to the insulation of electrical equipment due to overvoltage generated by oscillation. When closing and bouncing; When the duration is less than 2ms, there will be no significant overvoltage, the equipment insulation will not be damaged, and there will be no welding between the moving and stationary contacts during closing.

The different periods of closing and opening generally coexist, so adjusting the different periods of closing ensures the different periods of opening. The product requires a non synchronous opening and closing time of less than 2ms.

The closing and opening coils are designed for short-term operation, with a power on time of less than 100ms for the closing coil and less than 60ms for the opening coil. The opening and closing time is usually adjusted before the circuit breaker leaves the factory, and there is no need to move it again.