High-voltage circuit breaker is an important protection and control equipment in power system. The high-voltage circuit breaker can use spring operating mechanism to perform the opening operation. The opening time of circuit breaker refers to the time interval from the energized moment of the opening release of the spring operating mechanism to the time when the arc contacts of all poles are separated when the circuit breaker is at the closed position. The operation time of the opening release of the spring operating mechanism accounts for about 50% of the opening time of circuit breaker. Changing the operation time of the opening lock release of the spring operating mechanism is a key factor in adjusting the opening time of the circuit breaker. In order to effectively adjust the opening time of the circuit breaker

the opening lock system of the spring operating mechanism of high-voltage circuit breaker is taken as the research object based on the principle of the opening operation of circuit breaker

the mechanical dynamics simulation calculation and analysis methods are used to analyze the impact of the opening lock system on the opening time of the circuit breaker. The KOCOS mechanical characteristic tester and Phantom high-speed camera are used for experimental verification and

on this basis

optimization analysis is performed accordingly. The results show that changing the first level latch structure of the opening latch system of the opening lock system has a significant effect on changing the opening time of the high-voltage circuit breaker

and the method has a certain reference for the mechanical characteristics optimization of other circuit breakers or electrical equipment.