38
T3
Key lock (if provided).
Locking electromagnet (-RL1) (if
provided).
Auxiliary contacts in the operating
mechanism.
Locking electromagnet on the truck
circuit-breaker (-RL2) (if provided).
Auxiliary transmitted contacts for
signalling circuit-breaker racked-in,
isolated (UniGear or UniSafe swit-
chgear).
Open the circuit-breaker.
Turn the key and remove it.
Attempt the circuit-breaker closing operation.
Put the key back in and turn it 90°.
Carry out the closing operation.
With the circuit-breaker open, springs charged and
locking electromagnet not supplied, attempt circuit-
breaker closing both manually and electrically.
Insert the auxiliary contacts in suitable signalling
circuits.
Carry out a few closing and opening operations.
With the circuit-breaker open, in the isolated for test
position and the locking electromagnet not supplied,
attempt racking-in of the circuit-breaker.
Supply the locking electromagnet and carry out the
racking-in operation.
Insert the auxiliary contacts in suitable signalling cir-
cuits.
With the circuit-breaker racked into the enclosure,
carry out a few traverse operations from the isolated
for test position to the connected position.
Take the circuit-breaker to the racked-out position.
Neither manual or electrical closing takes place.
Both electrical and manual closing take place nor-
mally; in this position the key cannot be removed.
Closing is not possible.
Signals take place normally.
Racking-in is not possible.
Racking-in takes place correctly.
The signals due to the relative operations take place
normally.
ITEM INSPECTED
PROCEDURE
POSITIVE CHECK
8
9
10
11
12
Summary of Contents for VD4 12
Page 1: ...VD4 Installation and service instructions 12 24 kV 630 2500 A 16 31 5 kA ...
Page 2: ......
Page 46: ...44 Notes ...
Page 47: ......
