Nuova Via di Piano Comprensorio Vulcano
Sesto San Giovanni, MI 20099 Italy
Tel. 02-24105.001
IS 2653 GB
Page
16
of
18
Time base
V
is
u
a
l
in
s
p
e
c
ti
o
n
U
V
c
a
m
e
ra
a
n
d
in
fr
a
re
d
e
x
a
m
in
a
ti
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W
e
tt
a
b
il
it
y
3 Months
X
1/2 Year
X
X
When plant is off
X
X
Table 3 – Composite insulator intensive maintenance plan
10
General maintenance plan
The general maintenance plan is described in the next
Table 4
.
Component
Time base
Description
Notes
Composite insulators See
Chapter 9
Inspection and maintenance
See
Chapter 9
Gas SF6
Monthly
Check the pressure
Record the data
Toroids
When plant is off
Clean the surface and check for
scratches or deformation.
Check the fixing bolts to the flanges.
Anticipate the controls if
UV
camera
reveals
corona inception.
Gas
valves,
electrical equipment
and
connecting
cables
When plant is off
Clean the cubicle.
Check for gas leaks.
Check functionality of pressure
gauge and DILO Type valves.
Check terminal blocks, wiring, cables
and cable glands.
Check and clean the junction box.
Check all gas joints to
the DILO Type valves on
the bushing.
Check the cables and the
cable tray to the bushing.
Current terminals
When plant is off
Check for evidence of hot spots.
Check the terminals and tighten the
connecting bolts to the bushing
flange.
Check the cable clamps and the
bolting to the terminal.
Anticipate the controls if
IR camera reveals hot
spots.
Contact
GE
Grid
Solutions RPV in case of
evidence of hot spots
during the inspection.
Grounding terminals
When plant is off
Check for evidence of hot spots.
Check the connection integrity and
the bolt locking.
Verify the effectiveness of the
grounding.
Contact
GE
Grid
Solutions RPV in case of
evidence of hot spots.
