3
♦ 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)
No.
Speed definition
Applicable circuit breaker model
1
10ms after opening before closing
Certain oil switches and SF6 circuit breakers
2
5ms each after opening before
closing
Certain oil switches
3
10ms each after opening before
closing
4
6mm before closing and after
opening
Some 10kv vacuum circuit breakers
5
Speed before closing, 6mm after
opening
6
12mm before closing and after
opening
Some 35kv vacuum circuit breakers
7
16mm before closing, 32mm after
opening
LW8-35 type SF6 circuit breaker
8
36mm before closing, 72mm after
opening
LW6 type SF6 circuit breaker
9
120mm before closing and after
opening
LW7 type SF6 circuit breaker
10
10% to fracture
SF6 circuit breakers in some Xi'an switch
factories
Table 2
If none of the above definitions meet the current speed definition of the short circuit being tested, the
