Bushings; Cover-Mounted 25 Kv Class And Below - Westinghouse PS-1002 Instruction Book

12
LOCKING
PIN
F i g. 8
Operating Mechanism and Position indicator
sures the proper positioning. Once the tap changer locking
pin is in position, the tap changer handle cannot be
moved. For added safety, the handle may be secured in
position with a padlock. Kirk Key Interlock System is
optional.
DO NOT OPERATE THE TAP CHANGER WHILE THE
TRA NSF ORMER IS
SOURCE. THE TAP CHANGER WILL FLASHOVER
AND CAUSE TRANSFORMER FAILURE. THE TANK
MAY RUPTURE AND CAUSE PERSONAL INJURY.
Details of the internal tapchanger mechanism can be
obtained through your local Westinghouse Sales Office.
Tap changers are designed to operate without mainte­
nance; however, the moving and/or stationary contacts
may be removed for replacement in the case of minor
damage . Unit replacement is recommended in case of
breakdown .

5 . 13 Bushings

5.13.1 Cover-Mounted 25 KV Class and Below

Bulk-type bushings are used for voltage classes of 25 KV
and below. For currents up to
Draw Lead, Type "RJ" bushings are used (See Fig. 9).
OPERATING
HANDLE
ENERGIZED FROM ANY
amperes, Westinghouse
600
Fig. 9
Typical Cross-Section of "RJ" Draw Lead Bushing
installation of "RJ" Draw Lead Connection
The terminal which is crimped to the draw lead has a
steel pin pressed through a hole in the terminal diameter
below the threads. About 1/4 inch of pin extends on both
sides of the terminal to engage a slot inside the porcelain
top end. hole at the top of the draw lead terminal fa­
A
cilitates holding the lead while sliding the bushing over
it into position. When the draw lead terminal is properly
engaged in the slot about 1/2 inch of thread protrudes
above the porcelain top.
A
position . However, it may be necessary to hold some
leads by pressing between threads of the terminal with
a screwdriver until the terminal cap is partially threaded
onto the draw lead terminal.
thin coating of petrolatum is applied to the top sur­
A
face of the cap sealing gasket. The coated side of the gas­
ket is then pressed against the terminal cap gasket seat and
held in place. The terminal cap has a tapped hole in the
bottom and is screwe d onto the draw lead terminal until
hand tight. The gasket should be properly seated and the
DRAW LEAD
TERMINAL
TERMINAL CAP
g���ffLING
SILICONE RUBBER
GASKET
stiff draw lead will remain in