S&C Mark V Instructions For Field Assembly And Installation page 2

S8C Circuit-Switchers
-
Mark V
Grounding Switches - 70,000 Amperes Momentary
Outdoor Transmission
I
With 90-degree opening blades
perpendicular to bases when open
For Circuit-Switchers rated 230 kv
I
Step
1
For each Circuit-Switcher pole-unit, assemble the
grounding-switch live parts as follows:
(a) Mount the jaw-contact assembly on the side of the
Circuit-Switcher terminal support casting (at the
interrupter end) using the %"-1 1 X 1
%" stainless-
steel hex-head cap screws and lockwashers fur-
nished. See Figure l. The screws used to attach the
jaw contact should be left loose enough for
adjustment.
(b) Attach the grounding-switch mounting angles to the
Circuit-Switcher base as shown on the erection
drawing and Figure 1.
(c) Attach four %"-ll X 4%" threaded rods to the
mounting angles; each uses two hex nuts. Tighten
the nuts securely. Then attach a third hex nut-used
to level the grounding-switch assembly-to each of
the four threaded rods, positioned so that the top
surface of each nut is approximately 1% inches above
the top surface of the mounting angles.
(d) Install the grounding-switch assembly atop the
threaded rods and leveling nuts using the -lock-
washers and hex nuts furnished. Loosely tighten
these uppermost hex nuts.
Slowly close the grounding-switch blade into the
jaw-contact assembly, until the blade contact just
enters the jaw-contact fingers. The blade contacts
should enter the jaw-contact fingers on-center; if
adjustment is required, raise or lower the appro-
priate leveling nuts supporting the grounding-
switch assembly. To avoid changing the effective
height of the assembly,
do not aa!just more than three
of the four leveling nuts. When on-center blade travel
has been attained, securely tighten the bolts that
fasten the jaw contact.
(0
Adjust the leveling nuts further so that the ground-
ing-switch blade applies a definite pressure to the
jaw-contact fingers on closing (to ensure positive
contact engagement) and rests against its stop when
fully closed. Check for proper blade closure by
pulling the blade away from its closed position. See
Figure 1. With the blade fully closed and resting
against the nylon stop in the jaw assembly, it should
be possible to move the blade no more than 5 4 inch
before meeting positive resistance. When proper
blade closure has been attained, securely tighten the
uppermost set of hex nuts used to attach the
grounding-switch assembly to the mounting angles.
(g) Attach the flexible strap, for current transfer at the
hinge end of the blade assembly, to the grounding-
switch mounting angle using the
%"
stainless-steel
hardware furnished. Then connect the mounting
angle to a suitable earth ground.$
Step 2
Mount the outboard bearing assembly at the position
shown on the erection drawing. See Figure 2.
Step 3
Mount the S&C Manual Geared Operating Handle in
the position shown on the erection drawing.
Attach a universal coupling or a flexible coupling to
the output shaft of the geared operating handle. Refer
to the erection drawing and to Figure 2. If a flexible
coupling is used, thread the attachment bolts through
the flexible coupling plate and through the coupling
flange on the output shaft. Tighten the bolts to draw
operating and safety procedures of certaln electric utility
companies.
The grounding recommendatlons herem may differ from the standard
Where a discrepancy exists, the operatlng procedures of the electric utility
apply.
7 1 1 m630
INSTRUCTION SHEET
Page 2 of 9
S&C ELECTRIC COMPANY Chicago
July 14,1986
S&C ELECTRIC CANADA LTO.. Rexdale