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- 41 LOSS OF OVERHEAD POWER
Loss of overhead power to a locomotive can arise from
two possible causes, namely:(i)
A fault within the electrical equipment of the
electric rolling stock.
(ii)
Loss of supply to the overhead wiring caused
by an overhead wiring fault or by loss of
supply to a sub-station.
Electric Locomotives - Single Units
(i)
As soon as possible after the initial loss of
power, return the accelerating handle to the "off"
position and if using regenerative brake, the
regenerative handle to the "off" position.
Avoid stopping with any portion of the train on
a bridge, viaduct, catch-points, crossing or in
a tunnel, under an air gap, or any position
likely to obstruct trains on another line.
(ii)
If supply is not available two minutes after
the initial loss of power, the driver should
switch off motor generators and compressors,
lower pantographs, observe that they are lowered
and charge storage reservoir.
(iii) Four minutes after the initial loss of power
the driver should raise one pantograph and
arrange to have it carefully observed when it
makes contact with the overhead wire.
(iv)
If a flash occurs and power goes off immediately,
as indicated by the line voltmeter in the
driver's cabin. It is probable that there
is a fault on the locomotive. If such is the
case, the pantograph should be lowered and
arrangements made for a relief locomotive to
be obtained.
(v)
If power is restored and remains restored,
proceed.
(vi)
If there is no flash at the pantograph and
power is not restored the pantograph should be
lowered.