ABB OVB-SDB, Instructions Manual

Page: 23 / 64

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6.5 General Inspection of the circuit breaker
Part Abnormalities noticed Remedies
subjected to
Spring Presence of dust on the Clean with a dry brush or
operated mechanism cloth
mechanism
Distorted or oxidised spring Replace the damaged
spring
Locking rings out of place, Re-fix the locking rings in
loose nuts or screws. Their position and tighten
the nuts & screws
High voltage Presence of dust or dirt on the Clean with a dry brush or
breaker pole the insulating parts cloth
parts
Locking rings out of place, Re-fix the locking rings in
loose nuts or screws. Their position and tighten
the nuts & screws
Distortion or cracking of the Ask ABB Nasik for
insulating parts replacement of the
damaged parts
Trace of overheating or loose Clean the connections and
screws on the connection to the breaker terminals with
the circuit breaker terminals a rough rag soaked in a
suitable solvent cover them
with neutral grease and
tighten the screw
Earthing Trace of the oxidation and / Clean with a rough cloth
connection or loose nuts soaked in a suitable solvent.
Tighten the earthing
connection fully and cover
it with neutral grease
Auxiliary Check the supply voltage of The close/ opening coils
circuit supply the operating mechanism must operate correctly for
voltage electrical accessories values between 85% and
110% of the relative rated
voltage
Operating and Carry out the functional tests Replace the damaged or
control faulty elements (if
elements necessary as ABB Nasik)