L&T Electrical & Automation GIS GV3N, Руководство по эксплуатации и техническому обслуживанию

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Operation & Maintenance Manual 16
INSTALLATION
made according to the connection diagram given.
2) For CT s in buscoupler panel inside tank CT secondary
bushing connections are given in respective LV panel as
shown in Figure 5.3.6.
Precautions:
The terminals must be tightly, fastened.
Check the tightness of all terminals before energizing.
5.5 - Connecting Power Cable
Termination and connection of the power cable should follow
the instructions of cable termination manufacturer.
If CTs are mounted on bushing no need to remove CTs during
cable termination.
Terminate power cable into bushing. Ensure correct phase co-
ordination. Insert termination cables into sockets located at the
rear compartment and secure with screws. Align cable and
support cables properly to avoid tension.
The procedure for xing the gland plate is as below:
a) The gland plate can be cut into two for easy installation.
b) Measure the diameter of the cable.
c) Cut a semicircle on each half of the gland plates to match the
cable diameter.
d) Adjust the position of the power cable and mount the cable
gland plates onto the welded studs at the cubicle base plate.
Tighten the nuts securely.
e) If there is any gap between the power cables to ll the gap
with sealing compound.
f) The Cable screen should be properly connected to the panel
earthing.
Note: Connect only one end of the cable earth and not both. For
single core cables, there should be a gap between the split plates
and the same to be sealed with compound. This is to prevent
eddy current circulation.
5.6 - Inspection after Installation
5.6.1 - General Inspection
1) Check that the door can be smoothly opened and closed.
2) Make sure that the bolts and nuts that were tightened during
installation are not loose.
3) Factory-tightened bolts and nuts are torque-marked with a
red paint. Check that the marks on these fastenings are not
shifted.
4) Check that the earthing bars are correctly connected and that
the earth is connected at one point to the substation
earthing.
5) Inspect all protection relays and meters. Remove shipping
stops, if any.
6) Check the connection for control wiring.
7) Clean complete panel from inside and outside.
Figure 5.3.6 - Bus coupler CT secondary bushing terminals
1S1 1S2
2S1 2S2
E
3S1 3S2
R
Y B