remote control equipment - Indian Railways Institute of Electrical ...

1.0 General
Annexure 3.05
MAINTENACE OF VACUUM CIRCUIT BREAKERS
The maintenance and check execution standard depends upon the working
conditions of VCB. Such as the environmental condition. Current switching
frequency and others. The checks to be carried out. Their frequency and cope are
broadly as under:
Type of check Frequency Scope
Patrol Check Daily Check VCB under daily
Ordinary check Once every 3
Year or once every 1000
switching times
Detailed check Every 6 years “
Provisional check When a trouble occurs. “
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operating condition
Check VCB after
disconnection main supply
and local Remote switch in
LOCAL position.
For the minimum number of operation without replacement of vacuum bottle Para
1.5 below may be referred.
1.1 Patrol Check
Patrol check shall be done visually. If any abnormality is found, stop the operation
forthwith and examine.
Item No. Check Items Checking parts & key points. Explanation
1. General parts a) Dust and moisture
condensation and evidence
of rain water in operating
box.
b) Unusal sound, small and
decolouration.
c) Condition of open-close
indication
d) Working condition of
charge indicator
2. Temperature Main circuit terminals and
electrode pole assembly
3. Control
voltage
Check if the operating
voltage and control voltage
are kept at the respective
specified values.
“On in red. closed
condition. “off’ in
green open
condition
Check carefully if the
terminal section is
discoloured and
also, the air is
waving with heat.