Powell PowlVac ARG 4 Series, Instruction Bulletin

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16 Equipment Description
01.4IB.50023A PowlVac® Electrically Operated 15kV Ground and Test
per Long Island Railroad Specifications
The upper set of three (3) test ports is
connected to the primary disconnecting
devices.
A set of three (3) test probes (Figure 7, b) is
supplied with each ground and test device.
These probes are specially made to connect to
the test ports of the device and should be used
for all connections to the test ports. Grooves
around the circumference of the test probes
allow them to be held captive in the test ports
by slots in the shutters which cover the test
ports. This feature can be used with interlocks
to control the sequence of test operation.
G. l
everInG
-I
n
d
evIce
The ground and test device is moved between
the disconnected and connected positions by
the levering-in device. This consists of a shaft
which is supported by the device side sheets
and which has a crank arm at each end
(Figure 2, c)
. Rollers
(Figure 2, a)
attached to
the crank arms engage vertical slots in plates
attached to the cell and rotation of the shaft
causes the device to move in and out of
the breaker housing. The levering-in shaft
supports a racking gear at its right end just
outside the right device side sheet. The racking
gear is rotated by a worm gear on a shaft which
is terminated in a hexagon drive nut attached
with a shear pin. This shaft points in a direction
from the front to the back of the ground and
test device. This shaft has a threaded portion
carrying a threaded plate. As the worm shaft
is rotated, the threaded plate moves along
the shaft until it encounters either a front or a
back sleeve attached to the shaft and further
rotation of the worm shaft is prevented. At this
point, the ground and test device is either fully
inserted into the breaker compartment or is in
the fully disconnected position.
f. t
eSt
p
ortS
The ground and test device is equipped with
three (3) high voltage test ports (Figure 7, a) ,
mounted on a third insulation panel on the
upper front of the device. These test ports are
covered with insulating shutters (Figure 7, c)
which can be interlocked to control access to
the test ports.
!
CAUTION
The interlocking provided on the
PV-E 60600G13 electrically operated ground
and test device is of rugged construction and
is designed to deter incorrect operation but
any interlock mechanism can be damaged
or rendered inoperative by deliberately
bypassing or removing it, by force or by
careless abuse. Interlock mechanisms should
not be tampered with or abused. They
exist for the safety of the operator and the
protection of the equipment.
Figure 7 Test Ports
a. Test Port
b. Test Probe Inserted into Test Port
c. Insulating Shutter
a
b
c