Eaton VCPW-HD Instruction Booklet page 4

Instruction Booklet IB131024EN
Effective November 2017
2.2 38 kV SEG&TD interlocks and safety features
The 38 kV SEG&TD is designed to provide as many interlocks and
safety features as practical for the personnel performing any of the
operations described herein.
The device cannot be levered into or out of the "Connected" posi-
tion unless the grounding 38kV SEG&TD is "Open" .
An indicator on the front panel shows the status of the
•
grounding 38kV SEG&TD contacts, "Open- Ungrounded" or
"Closed-Grounded" .
The power to operate the grounding 38kV SEG&TD in this
•
device is obtained through the secondary disconnect in the
switchgear compartment.
The grounding breaker cannot be opened electrically in less
•
than 20 seconds after closing. This feature permits the source
interrupter to clear a fault if the grounding 38kV SEG&TD is
inadvertently closed on an energized circuit.
The control switch cable is connected to the device with a
•
twist lock connector.
 WARNING
IMPROPER USE CAN RESULT IN DEATH, SERIOUS PERSONAL INJURY, OR
PROPERTY DAMAGE.
2.3 Interlocks - basic elements description
There are five interlocks located on the front of the 38 kV SEG&TD.
They are labeled as Lock #1 through Lock #5. The labels also identify
the key(s) to be used in the locks as KB, KC, KD, and KU. Locks #1,
#2, and #4 are two cylinder locks while locks #3 and #5 are single
cylin¬der locks (see Figure 8 and Table 1 for details).
Lock #5
Lock #2
Lock #3
Mechanical lift lock
Figure 8. Interlock locations on the front of the 38 kV SEG&TD.
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Table 1. 38 kV SEG&TD interlock details.
Lock # of cylinders
Lock #1 2
Lock #2 2
Lock #3 1
Lock #4 2
Lock #5 1
There is also a mechanical lift lock that, when locked, prevents the
operation of the "Push to Open" and "Push to Close" buttons.
2.3.1 Single cylinder locks
Single cylinder locks are used in two positions on the 38 kV
SEG&TD: Locks #3 and #5. Single cylinder locks have two positions:
locked (see Figure 10) or unlocked (see Figure 9).
Figure 9. Typical single cylinder lock (38 kV SEG&TD Lock #5
shown).
In a single cylinder lock, when the key is inserted into the lock and
turned to the "locked" position, the associated 38 kV SEG&TD func-
tion will be inoperable and the key can be removed. When the key
is in the lock and turned to the "unlocked" position, the associated
38 kV SEG&TD function will be operable and the key is captive in
the lock.
Lock #4
Lock #1
Figure 10. Typical single cylinder lock in the "Locked" position
with the key ready for removal.
2.3.2 Two cylinder locks
Two cylinder locks are used in three positions on the 38 kV SEG&TD:
Locks #1, #2, and #4. Two cylinder locks have four positions (two for
each key): key 1 locked (see Figure 11) or unlocked and key 2 locked
or unlocked (see Figure 12).
38 kV Type VCPW-HD Simple Electrical
Ground & Test Device (SEG&TD) lower
terminal instruction booklet
Key(s) required
KB KU
KB KC
KC -
KB KD
KD -