Powell PowlVac 38, Instruction Bulletin, Page: 14 / 35

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6 Equipment Description
PowlVac 38™ CDS Electrically Operated
Ground & Test Device per ConEd Specification EO-2022-15
01.4IB.65090A
Ch 3 Equipment Description
A. G
enerAl
The PowlVac 38™ CDS Electrically Operated
Ground & Test Device (Figure 2) is a drawout
element that can be inserted into the circuit
breaker compartment in the same manner as a
PowlVac 38 CDS circuit breaker.
The PowlVac 38 Electrically Operated Ground
& Test Device provides a means for obtaining
access to the primary disconnecting devices of
the switchgear compartment for purposes of
grounding the primary circuits or conducting
certain high voltage test procedures such as
conducting high voltage withstand (hipot)
tests.
The grounding switch is operated by a stored
energy mechanism. It is capable of applying
the ground against a live circuit if operational
errors have not cleared the circuit. However, in
such a case, the relaying at the source of power
is expected to cause the source interrupter to
clear the circuit.
B. G
round And
t
eSt
d
evIce
o
perAtIon
1) Closing
The ground and test device is closed by the
remote control box at the end of a 50 foot
long cable that is supplied with the device.
Upon depressing the CLOSE pushbutton
(Figure 1, b) , the closing springs start to
charge. After the springs are fully charged,
the springs automatically discharge to close
the switch contacts.
Once the ground and test device is closed,
it can be locked into the CLOSED position
by removing the power cord
(Figure 1, c) from the remote control box
plug receptacle (Figure 3, n) on the ground
and test device.
2) Opening
The ground and test device can be opened
electrically using the remote control box.
The OPEN pushbutton must be depressed
(Figure 1, d) . For safety reasons, the switch
is prevented from opening in less than 20
seconds after closing.
Figure 1 Remote Control Box
a
b
d
c
a. On/Off Switch
b. Close Pushbutton
c. Power Cord
d. Open Pushbutton