GE Industrial Solutions Power-Vac Metal Clad Switchgear, Addendums User Manual

06/06/2005

Addendum #1 to GEK-39672G

Instructions for making bus connections across shipping split sections

Introduction

PowerVac switchgear is shipped in splits of one, two, three or four stacks. When
connecting shipping splits together it may be required to make the connections across the
main bus or the tie bus. The main bus can be accessed from the front of the gear through
the breaker compartment and the tie bus can be accessed from the rear. Breakers and
rollouts should be removed from the switchgear before the bus connections can be made
across the shipping split.

This addendum supplements the instructions provided in the main body of the instruction
book in pages 28 to 32. Ground bus connections across shipping splits shall be made as
specified in page 35 of the instruction book.

WARNING : All primary and secondary circuit devices must be de-energized and the
primary circuit grounded before undertaking any work on the switchgear.

Main bus connections across the shipping split

Step – 1, Remove horizontal barrier

A horizontal barrier located between the front upper and lower compartments has to be
removed. This barrier is shown in Fig – A(1)-1.

If heaters are provided, the heater shown in Fig – A(1)-1 will have to be removed in order
to remove the horizontal barrier.

Do not remove the pan on which the breaker ground shoe is located. Item # 4 in Fig –
A(1)-1. In most cases the pan shown as item #4 will have a cover over it ( cover not
shown in Fig A(1)-1). It is not required to remove the cover.

(

(6) Do not remove

(3) Remove

later)

(2) Remove

(1) Remove

heater

Fig – A(1)-1

Front upper compartment

For stacks that have a 2 High PT/CPT tray in the front upper compartment, the procedure
for removing the horizontal barrier is different from that shown above. For such stacks,
remove the three taptites ( self threading bolts ) shown in Fig A(1)-2 in the front upper
compartment. When these taptites are removed, the barrier underneath shown in Fig –3
can be removed.

(5) Do not remove

(4) Do not remove

Remove these three taptites

Fig A(1) - 2

Front upper compartment intended for 2-High rollouts

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p

p

The underside of

the taptites

This barrier can be

removed when the 3

taptites are removed.

Fig – A(1)-3

View looking up into the front bottom compartment of a 2 High-A rollout stack

Step – 2, Remove vertical mid barrier in front lower compartment

Remove the vertical mid barrier located in the upper part of the lower front compartment.
This barrier is located approximately 49 inch from the front of the stack. See Fig – A(1)­4a for identification of barrier in the breaker compartment and A(1)-4b for identification
of barrier in a PT/CPT rollout compartment

Remove this

barrier

Fig A(1)-4a

View looking into typical

front lower breaker

artment

com

Step – 3, Remove vertical mid barrier in front upper compartment

Remove the vertical mid barrier located in the lower part of the upper front compartment.
This barrier is located approximately 49 inch from the front of the stack. See item # 3 of

View looking into typical

front lower PT/CPT rollout

Fig A(1)-4b

artment

com

Remove this

barrier

52

Fig – A(1)-1. Do not remove the secondary disconnect block ( item # 5 ) or the chain (
item # 6 ). This barrier can be removed by sliding it down. This will expose the main bus
compartment as shown in Fig – A(1)-5

Tape

Boots

Tape

Tape

Fig – A(1)-5

View looking into main bus compartment from the front

( Porcelain inter-unit bus supports )

Step – 4, Remove glastic shipping supports

Unbolt and remove the glastic shipping supports taking care to ensure that splice plates
and spacers provided in the bus joint do not fall off. Loosely refasten bus hardware to
hold the splice plates and spacers in place. Discard the shipping supports. The red
insulating boots will have to be removed to access the bolts for the shipping supports.
The boots are held together using plastic re-useable pull-apart fasteners.

Step –5a, Remove inter-unit bus supports ( Go directly to step 5b if polyester glass bus
supports are provided)

a) Apply strong adhesive tape so as to keep the two glastic supports together

temporarily. The tape may be applied in 4 places – above, below and between the
porcelain bus supports. See Fig A(1)-5 and Fig A(1)-6. In Fig A(1)-6, the bus
support is shown outside the switchgear to get good picture clarity. It is not
required to remove the bus supports out of the switchgear.

b) Remove the ¼ - 20 fasteners used to mount the bus support to the side sheet.

There should be 4 ( 2 for poly glass) on the top and 4 ( 2 for poly glass ) at the
bottom. The hex nut should be towards the outside on the left hand side of the
side sheet.

c) Gently remove the bus support assembly away from the side sheet and into the

bus compartment. Let it rest temporarily in a vertical position inside the bus
compartment.

Copper Main bus or

Glastic shipping supt.

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Fig – A(1)-6

Location of tape

Fig A(1)-7

Typical Bus compartment with polyester glass inter-unit bus support

Step – 6 Align switchgear stacks

a) Gently align the next stack on the left with this stack taking care not to damage

the porcelain bus supports.

b) When the eight bus support holes ( four holes for polyester glass bus supports )

are aligned, replace the bus support assembly against the side sheet and use the ¼

- 20 hardware to fasten the bus supports and the two side-sheets together as shown
in Fig A(1)-8

c) A black rubber gasket is provided to cover the edge of the side sheets around the

perimeter of the bus pass-through cutout for 15kV gear. It should be ensured that
this gasket is in place.

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