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and the screws position 7
- tighten the screws pos.
33a and 33b)
- proceed the same way the screws pos. and (FIG. 4
- tighten the screws pos.3
3 Arcing chambers Presence offumes dust
- Presence cracks the external plastic structure
- Excessive difference wear between the firstand last
arc extinguishing plate
- Remove with compressed air and remove the fumes
and any slag with brush
- Replace the arcing chamber
- Replace the arcing chamber
4 Main circuit Busbars Insulating contact Presence dust dirt the insulating parts
- Safety rings out place, screws nuts loose
- Deformation cracks ofthe insulating parts
- Insulating contacts oxidized (only for withdrawable
circuit-breaker)
- Wear overheating marks screws loose the
connections the terminals the circuit-breaker
(only for fixed circuit-breaker)
- Clean with brush dry cloths
- Put the rings back place and tighten screws and
nuts appropriately
- Ask ABB SACE replace the damaged parts
- Remove the shutters and clean with rough cloth
soaked suitable solvent and lubricate moderately
with neutral grease
- Tighten the screws suitably
5 Earthing contacts (only for withdrawable circuit-
breaker) Presence ofrust loose nuts
Clean with rough cloth soaked suitable solvent and
lubricate moderately with neutral grease.9 mm
E4 0.5 mm
Fig.
21/158
. and
8
- close the circuit-breaker and check the gap A
4) Ifthe gap not correct, open the circuit-breaker again and repeat
the procedure indicated item 3b
5) the gap correct, open the circuit-breaker again, seal with
yellow paint and reinstall the arcing chambers. rest the shaft,
tacking action the nuts pos.
Circuit-breaker
A
E1 1.Item inspected d
8. Tighten the
nuts completely
6 Earth connection (only for fixed circuit-breaker)
Presence ofrust and/or loose nuts
Clean with rough cloth soaked suitable solvent,
fully tighten the earth connection and cover with neutral
grease
7 Auxiliary circuit power supply voltage
Check the power supply voltage the electrical
accessories ofthe operating mechanism
The releases and locking devices must operate normally
for values between 85% and 110% ofthe corresponding
rated voltage
8 Operating and control parts
The operating tests, which must carried out shown
in paragraph 6.3. 33a)
- proceed the same way the screws pos.1 and the nuts pos. and and the nuts pos. and the nuts pos. 33
Model 2234 Apparatus Scale
L 2778
Doc No' 1SDH000460R0002
Page No.2 General inspection the circuit-breaker
Rem edy
1 Operating mechanism/Electrical accessories Presence dust the internal parts
- Springs deformed rusty
- Safety rings out place, nuts screws loose
- Wires and straps detached
- Clean with brushes dry cloths
- Replace damaged springs
- Put the rings back place and tighten screws and
nuts appropriately
- Replace the straps and connect the detached wires
correctly
2 Arcing and main contacts Traces ofwear
- Incorrectadjustments: distance -Fig.2
- bring the bushes the operating mechanism (pos. 2
- bring the bushes the operating mechanism (pos.
1) Open the circuit-breaker
2) Remove the arcing chamber
3a) Adjust the distance the moving contacts for E1-E2-E3:
- loosen the screws inpos. rest on
the shaft, tacking action the nuts pos. and the nuts pos.1 have shown defects the components
Replace the defective parts those with faulty
operation (if necessary, ask ABB SACE)
8 r
In order ensure the gap indicated the table, you can adjust the
position the shaft and the operating mechanism.8 for E4-E6
- Smooth the contacts with emery cloth
- Adjust according the paragraph 8. (FIG.8 1. and the
bushes the intermediate abutments (pos.3 and4
- close the circuit-breaker and check the gap A
3b) Adjust the distance the moving contacts for E4-E6:
- loosen the screws pos.3.33 less than
1 for E1-E2-E3 less than 0
