26 S&C Instruction Sheet 765-500
Step 25
For 25 kV switches. Check the following on
each phase.
a. Examine the interrupter and blade align-
ment. The interrupter must be parallel to the
sweep of the blade.
b. Partially open the switch. The following
conditions should be met:
• A ¹⁄c₂ clearance between the bottom of
the opening cam and the top of the clos-
ing lever
• A ¹⁄c₂ minimum clearance between the
bottom of the closing lever and the top
of the blade.
c. Open the switch and place the blade in the
position shown in Figure 26, View A. The
following conditions should be met:
• A ¹⁄₆₄ minimum clearance between the
opening cam and the opening lever.
• A clearance between ⁵⁄c₂ and ⁷⁄c₂ between
the shunt contact and the interrupter
housing at the beginning of the closing
sweep.
d. Place the switch in the fully-closed position.
The following conditions should be met:
• A clearance of ¹⁄₈ to ³⁄₈ between the
closing cam and the closing.
• A ¹⁄₂ minimum clearance between the
blade shunt contact and the interrupter
housing contact
View A, During Closing
Main contact
¹⁄₆₄ min.
Opening cam
Opening lever
Closing cam
B⁄₃₂ to ⁷⁄₃₂
Closing
lever
Interrupter
housing
View B: Closed Position
Blade shunt contact
Opening cam
Jaw contact
casting
Closing
lever
Opening lever
¹⁄₈ to ³⁄₈
¹⁄₂ min.
Interrupter
housing
contact
Closing
cam
Figure 26. Operating checkpoints for switches rated 25 kV.
Installation
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