Installation Manual

Installation procedure
Mounting requirements
Sidewall-mounted with the internal stud end completely
immersed under oil or SF
6
. All parts should be inspected
for damage before using. Clamping studs must be welded
around the bushing hole to accommodate either a 3-hole or
4-hole clamp. Install the gasket over the bushing assembly
through the tank hole and place the clamp* over the weld-
ed tank studs against the bushing flange. Install a plated
lock-washer and nut onto each stud and tighten to recom-
mended torque. The Tri-Clamp well should have a plated
flatwasher, lock washer and nut. Tighten to recommended
torque. Connect internal lead to the internal bushing stud
using recommended torque and procedures. See Figure 5.
*One-piece molded (Tri-Clamp) bushing well does not require a
clamp.
Table 2. Tank Hole (Ref. Figure 4) 4-Stud Square Clamp
kV Class Description
"A"** Tank
Hole Size (Dia.)
"B"
C-C Stud Spacing
15 & 25
200 A Bushing
Well with a 2.19"
Diameter Shank
2.25"
(57 mm)
2.75", 3.00", or
3.25"
(70, 76, or 83 mm)
15, 25
& 35
200 A Bushing
Well with a 2.50"
Diameter Shank
2.56"
(65 mm)
2.75", 3.00", or
3.25"
(70, 76, or 83 mm)
35
200 A Loadbreak 3Ø 2.75"
(70 mm)
3.87"
(98 mm)
15, 25
& 35
600 A Deadbreak
2.56"
(65 mm)
3.43"
(87 mm)
Figure 4. Tank mounting hole for 3- and 4-hole stud
configuration.
“A” “A”
“B”
4 STUD
3 STUD
MOUNTING
STUDS
“C”
BOLT CIRCLE
DIAMETER
30TYP.
4.7" (120 mm) MIN. DIA. EXTERIOR MOUNTING SURFACE BETWEEN THE
DOTTED LINE AND TANK HOLE TO BE FLAT AND CLEAR OF
SURFACE OBSTRUCTIONS, SUCH AS WELD SPLATTER.
120 TYP.
Table 1. Electrical Ratings
kV
Class Description
Voltage Withstand
Continuous
Current
Rating*
Impulse
Withstand
kV BIL
Minimum
Corona
Voltage
Maximum
Rating
Voltage
(RMS)
AC 60 Hz
1 Min RMS
DC
15 Min P-G P-P
15, 25, & 28 200 A Bushing Well (HTN and epoxy) 40 78 200 A 125 21.5 16.2 –
35 Tri-Clamp, 200 A Bushing Well 50 103 200 A 150 26 21.1 –
35 1-Pc, 200 A Loadbreak Bushing 50 103 200 A 150 26 21.1 36.6
15/25 1-Pc, 600 A Deadbreak Bushing 40 78 600/900 A 125 19 15.2 –
35 1-Pc, 600 A Deadbreak Bushing 50 103 600/900 A 150 26 21.1 –
35 1-Pc, 600 A Deadbreak Bushing 70 114 600/900 A 200 26 21.1 –
* 600 A with aluminum components and 900 A with copper components.
Figure 5. High voltage bushing (all, including bushing
well) internal lead training. (Bushing shown-35 kV, 600 A
deadbreak.)
BUS BAR:
No sharp edges
or corners.
Should be
directed parallel
to or away from
tank wall.
GASKET
TANK
WALL
TIGHTENING
NUTS
(1 OR 2)
SPACER NUT
HIGH VOLTAGE LEAD AND TERMINAL:
No sharp edges or burrs. Should be directed
parallel to or away from tank wall.
2
High-voltage primary bushings installation instructions S800-35-2 November 2013 www.cooperpower.com