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IB131012EN
Effective March 2016
Disabled
Figure 14. Electrically disabled with key KU retained. Electrically
enabled with key KB retained.
2.4.2
Lock #K2 (keys KB and KC)
The Lock #2 interlock is a two cylinder lock used to mechanically lock
the 38 kV SEG&TD in the "Open" position. The device is locked in
the "Open" position when key KB is in the "Unlocked" position and
key KC has been rotated to the "Locked" position and removed from
the lock (see Figure 15).
Figure 15. Lock #2 locks the SEG&TD in the "Open" position
with key KB retained.
2.4.3
Lock #3 (key KC)
The Lock #3 interlock is a single cylinder lock that, when locked, pre-
vents the 38 kV SEG&TD from insertion into, or removal from, the
switchgear compartment.
In this design, the Lock #3 in the locked position (lock pin extended)
blocks the 38 kV SEG&TD slide handles from being moved to allow
insertion into or removal from the SEG&TD (see Figure 16). Key KC
is removable from Lock #3 when the lock bolt is extended.
6
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Figure 16. Lock #3 with the locking pin extended and the slide
Enabled
handles locked in position.
N
2.4.4
The Lock #4 interlock is a two cylinder lock used to mechanically lock
the 38 kV SEG&TD in the "Closed-Grounded" position.
In this design, the Lock #4 interlock is a two cylinder lock used with
the "Closed Locking Device" to prevent the 38 kV SEG&TD from
being opened. When the SEG&TD is in the "Open-Ungrounded"
position, the "Closed Locking Device" is disabled. Key KD is
retained when the lock pin is retracted. When the SEG&TD is
"Closed-Grounded" , the "Closed Locking Device" is free to move
to the right. The lock bolt can now be extended and the "Closed
Locking Device" will be held in the secured "Closed-Grounded" posi-
tion. Key KD is now removable from Lock #4.
Figure 17. Lock #4 locks the SEG&TD in the "Closed-Grounded"
position with key KB retained.
In this secured position, the "Closed Locking Device" has blocked
operator access to the manual "Open" button. Also, in this secured
position, a Selector switch electrically disables the electrical "Open"
function; and a mechanical interlock holds the main contacts in the
closed position even if the mechanism is tripped. A padlock hasp
is provided for securing the "CLOSED-Grounded" position with a
customer-supplied padlock (see Figure 18).
38 kV Type VCP-WHD Simple Electrical
Ground & Test Device (SEG&TD) upper
otee:
Key KC normally resides in Lock #2 when not being used in Lock #3.
Lock #4 (keys KB and KD)
terminal instruction booklet
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