ABB HD4/R User Manual

32
9. Routine inspections
Before proceeding with any operation,
always make sure that the springs of the
operating mechanism are discharged and
that the apparatus is in the open position.
9.1 General information
During normal service, the circuit-breakersaremaintenance-
free. Any interventions required basically depend on the se-
verityoftheserviceconditions,i.e.tovariousdifferentfactors
suchasthefrequencyoftheoperations,theinterruptedcurrent
values,therelativepowerfactorandtheinstallationsite.
Forprecautionaryreasons,aninspectionscheduleisgivenin
thetableinthefollowingsection,alongwiththefrequencywith
which the equipment must be checked.
Asfarasthislatterisconcerned,itisadvisabletocomplywith
thespecificationsinthetable,atleastduringthefirstinspec-
tion.
Optimal time limits for carrying out successive operations can
be established on the basis of the results obtained during the
routine inspections.
9.2 Inspection schedule
Inspection Frequency Criteria
1
Perform five mechani-
cal closing and opening
operations.
Once a year The circuit-breaker must
functionnormally,without
stopping in intermediate
positions
2
Visualinspectionofthe
poles (resin parts)
Once a year
or after
every5,000
operations
The resin parts must be free
fromanybuilt-updust,dirt,
cracks,dischargesortraces
of surface discharges
3
Visualinspectionofthe
operating mechanism
and transmission
Once a year
or after
every5,000
operations
The elements must not be
deformed in any way.
Screws,nuts,bolts,etc.,
must be tight
4
Measurement of the
insulation resistance
Every 5
years or after
every5,000
operations
See sect. 8.1 point 1
5
Checking interlock
operation
Every 5
years or after
every5,000
operations
The interlocks provided must
function correctly
Warning!
Contact the ABB Assistance Service and have the circuit-
breakercompletelyoverhauledafter10,000operationsorafter
10 years.
9.3 Troubleshooting
The shunt opening and/or shunt closing release remains energized
Faults
The shunt opening and/or shunt closing undervoltage releases are insufficiently energized
Releasecoilsinterruptedorburnt,gearmotorwindinginerrupted
The circuit-breaker fails to open
The circuit-breaker fails to close
Flashovers
Possible causes Inspections and remedies
•
Operating or accept contacts locked closed
Check the condition of the contacts in series with the
release
• • •
Supply votage of the auxiliary circuits too low
Measure the voltage: it must not be less than 85% of the
rated voltage
• •
Supply voltage different from the value indicated on the
nameplate for these releases
Check the voltage indicated on the nameplate of the
releases
• • • • •
Faulty switching circuit
Checktheconnections,fuses,interlocks,protection
switches and accept contacts
• • •
Loose wire clamping screws Make sure that the wire clamping screws are tight
• • • • •
Incorrect electrical connections in the power supply circuit Check the connections with the relative functional diagram
• • •
Release coils interrupted Replace the coils
•
Conductive dust on the insulating parts
Clean carefully. Check the insulation resistance with a 2500
VMegger(sect.8.1.)
• • •
Operating mechanism locked
Operate in the manual mode. Contact ABB if the fault
persists
•
Key not inserted in the key lock of the operating mechanism Insert and turn the key
•
Undervoltage release not energized Check the relative supply circuit
•
Shunt opening release remains energized
Check the supply circuit and the relative contact in series
with the release coil

ABB HD4/R Specifications

General

Brand	ABB
Model	HD4/R
Category	Circuit breakers
Language	English