Periodical Checks - ABB OHB Installation, Service And Maintenance

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Outdoor SF6 Circuit Breaker - Type
OHB: Instruction for Storage,
Installation, Service and
Maintenance
Original Title: ABB Breaker
Uploaded by Sampath Kumar
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9.Periodical checks:

!
9.1. General
During normal service, the circuit-breakers
are maintenance-free. The frequency and
sort of inspections basically depend on the
service conditions. Various factors must be
taken into account: frequency of
operations, interrupted current values,
relative power factor and the installation
ambient.
9.2 Checking program
Checking operation
Carry out five mechanical
opening closing operations.
Visual inspection of the poles
(insulating parts).
Visual inspection of the operating
mechanism and transmission.
Measuring the insulation
resistance.
Before carrying out any operation, make sure that the operating
mechanism springs are discharged and that the apparatus is in
the open position.
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As a precaution, the following
gives the checking program , s
the relevant time intervals. As
time interval between these o
is concerned, it is advisable to
with specifications given in the
least during the first check. On
of the results obtained during t
inspections, contact an ABB se
for any clarifications.
Time interval
1 Year The circuit-breaker must
normally without stopping
intermediate positions
1 Yr./ 5000 The insulating parts must
operations any accumulation of dust,
discharges or traces of surf
discharges
1 Yr./ 5000 The elements must be free
operations deformation.
Screws, nuts, bolts, etc. mu
1 Yr/5000
operations
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ABB Protection Transform
ABB
Criteria
See par. 8.1. point 1.