♦ Opening / closing time: When the opening / closing coil is powered on as the timing starting point, the time to the opening / closing of the moving and static contacts.
♦ In the same period: Among the same phase, the difference between the maximum and minimum opening / closing time.
♦ Phase-to-phase synchronization: The difference between the maximum and minimum opening / closing time among three phases.
♦ Average speed: During the opening (closing) process, remove the front and back of the moving contact by 10%, take the middle 80%, the ratio of the travel of the moving contact to time.
♦ Maximum speed: During the opening (closing) process, after the moving contact starts to move, the moving contact movement is taken as a speed measurement unit every 10ms until the moving contact movement stops, and several speed unit values are obtained. The speed value is the maximum speed of opening (closing).
♦ Rigid opening / closing speed: According to the manufacturer of the switch to be tested, the switch model is different, and each manufacturer defines different rigid opening and closing speeds. This tester includes various different definitions in it. User chooses (as shown in the table below)
Applicable circuit breaker model
10ms after opening before closing
Certain oil switches and SF6 circuit breakers
5ms each after opening before closing
Certain oil switches
10ms each after opening before closing
6mm before closing and after opening
Some 10kv vacuum circuit breakers
Speed before closing, 6mm after opening
12mm before closing and after opening
Some 35kv vacuum circuit breakers
16mm before closing, 32mm after opening
LW8-35 type SF6 circuit breaker
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