Installation Manual

Dielectric clearances
Oil level and bushing clearance to other internal compo-
nents to be suitable for voltage class of equipment and
components.
Minimum underoil clearances:
Torque requirements
Clamping Flange
•
For 3-hole and 4-hole clamp torque requirements, see
Table 4.
•
Molded (one-piece) Tri-Clamp bushing well should be
tightened to 70-80 in-Ibs torque.
ote:N For SF
6
bushings torque should be held at 50-60 in-
lbs.
Hold clamping flange against the bushing and tighten
all nuts by hand against the lockwashers. With a torque
wrench, tighten nuts down gradually, alternately in
increments until the recommended torque is obtained. On
4-hole stud clamp tighten nuts in a diagonal sequence.
Mounting studs should be free of nicks, paint, dirt and weld
splatter. They must also be correctly positioned to avoid
binding on the clamping flange.
Internal (underoil or SF
6
) bushing stud
Brass nuts are recommended for copper threads and
aluminum nuts for aluminum threads. Nuts for internal
bushing studs should be tightened as follows:
200 A, 3/8 - 16 brass nuts 12-15 ft-lbs
600 A, 5/8 - 11 brass nuts 50-65 ft-lbs
600 A, 5/8 - 11 aluminum nuts 50-65 ft-lbs
Install nut onto the internal bushing stud. Place high voltage
lead terminal with crimped ring torque terminal onto the
bushing stud against the nut. Place a second nut onto
bushing stud and tighten to the recommended torque. An
optional locking nut may also be placed on the stud and
tightened to the recommended torque.
Removable stud bushing well
The part number for the removable stud replacement
kit is 2639081B01B. For replacement instructions of the
removable stud from bushing well/insert, refer to S800-34-2.
Grounding of bushing insert
It is recommended that, when a bushing well insert is
installed into the well, the Insert be grounded by attaching
a #14 AWG or equivalent wire between one of the three
mounting studs to one of the tabs on the Insert (see
S500-12-1). This can be accomplished by wrapping the wire
around one of the studs and securing with an additional 3/8"
nut. Other options are available. Please contact your Eaton's
Cooper Power Systems representative for more information.
Table 3. 3-Stud Triangular Bushing Clamp or One Piece
Tri-Clamp Bushing Well
kV Class Description
"A"** Tank
Hole
Size (Dia.)
"C"
Bolt Circle (Dia.)
15 & 25
200 A Bushing
Well with a 2.19"
Diameter Shank
2.25"
(57 mm)
4.68"
(119 mm)
15, 25, & 35
All 200 A Bushing
Wells with a 2.50"
Diameter Shank
2.56"
(65 mm)
4.68"
(119 mm)
35 200 A Loadbreak
2.75"
(70 mm)
4.68"
(119 mm)
ote:N Recommended Tank Stud Dimension 3/8" - 16 x 1.625"
(41 mm).
** "A" Tankhole Size Tolerance is -0.00"/+0.10" (-0/+2.5 mm)
kV BIL Clearance to Ground or Between Phase
95 1.1" (28 mm)
125 1.5" (38 mm)
150 2.5" (64 mm)
200 3.5" (89 mm)
Table 4. Torque Requirements-Clamping Flange
kV Class Description
Torque
(in-lbs)
15 & 25 200 A Bushing Well with a 2.19"
Diameter Shank
40-60
15, 25, & 35 200 A Bushing Well with a 2.50"
Diameter Shank
40-60
35 200 A Loadbreak 3Ø 40-90
15, 25, & 35 600 A Deadbreak 40-90
3
High-voltage primary bushings installation instructions S800-35-2 November 2013 www.cooperpower.com