ABB IS-limiter - Repair and Component Replacement

30 36KV I
S
LIMITER PANEL INSTALLATION, OPERATION AND MAINTENANCE MANUAL
CAUTION!
Recommendations for the charges:
• Replacement after 8 years for I
S
-limiter
TM
inserts which have been in service
• Replacement after 12 years for I
S
-limiter
TM
inserts which have not been in service
Repair and testing of I
S
-limiter
TM
inserts:
Repair and testing of I
S
-limiter
TM
inserts may only be carried
out at ABB Calor Emag (manufacturer’s works)!
Continuity testing:
Continuity testing on the I
S
-limiter
TM
inserts can be carried
out with a continuity tester. It is essential to unscrew the
HV fuse from the main conductor for such a test. Check the
HV fuse and main conductor for continuity separately.
CAUTION!
Only test the main conductor for continuity
between the face edges. Do not touch tripping
contact 7 with the continuity tester,
as otherwise, the charge will be activated.
When refitting the HV fuse to the main
conductor, firmly tighten the fastening screws
CAUTION!
Verification of design data:
Verification of the design data (response values,
settings) and I
S
-limiter
TM
inserts is required on:
• Changes to the operating conditions
• Changes in short-circuit currents
• Installation of capacitor banks on the voltage
level of the I
S
-limiter
TM
The response values and settings are listed in the relevant
order-related data sheet.
7.4 Repair
7.4.1 Switchgear surfaces
• Carry out repair work immediately after a defect has
been discovered
• Completely remove all rust from damaged paint-work
areas on steel sheet and other steel parts by mechanical
means, e.g. with a wire brush
Lightly grind the surrounding paint coat and carefully
degrease the entire area. Then immediately apply an
anti-rust primer and, after an appropriate hardening time,
apply the topcoat. Only use suitable and compatible paint
products.
Topcoat in standard color RAL 7035, or the relevant special
color.
• Carefully remove any white rust from aluminum/zinc
surfaces with a wire brush or Scotch-Brite, and remove
loosely adhering particles with a dry, non-fraying cloth.
Then treat the cleaned areas with zinc spray or zinc
dust paint, and then with aluminum spray to match up
the color
• Carefully remove any white rust on chromium plated
functional parts and rust on phosphatized parts with a
wire brush or Scotch-Brite, and clean with a dry cloth.
Then evenly grease the parts (with Isoflex Topas NB 52)
7.4.2 Replacement of components
I
S
-limiter
TM
insert: In case of tripping of the insert for any
one or all the phases, then the I
S
-limiter
TM
insert needs to be
replaced with new I
S
-limiter
TM
insert.
Procedure for replacement of the I
s
-limiter
TM
insert after
tripping:
1. Check the indicator relay to determine which phase the
I
S
-limiter
TM
has tripped in. Do not reset the signal as yet!
2. Switch the tripping device off at the main switch on the
power unit.
3. Remove the I
S
-limiter
TM
inserts in phases L1, L2 and L3.
We recommend replacing all the I
S
-limiter
TM
inserts with
new ones after tripping.
4. Insert new I
S
-limiter
TM
inserts (see section 5.4 for
procedure).
5. Reset the trip indication (indicator relay).
6. Switch the tripping device ON at the main switch on the
power unit.
7. When the system is ready for operation again, the
removed I
S
-limiter
TM
inserts are to be checked:
• The green indicator on the I
S
-limiter
TM
insert
indicates that the insert has tripped
• The red indicator on the fuse indicates that the fuse
has blown
It is possible that an insert has reacted (green indication)
even though the fuse has not blown (red ball not visible). See
also I
S
-limiter
TM
insert continuity testing in section 7.3.1.
NOTE!
If the tripping device is switched ON without resetting the
tripped indication, it has to be switched off again at the
main switch:
Reset the tripped indication after approx. 1 minute, and
then turn the main switch ON again.
Activity of replacement of Is-limiterTM insert must be
carried out by authorized ABB service engineer