The signals due the relative operations are
given correctly.
Carry out some racking-in and out operations. Interlocking
devices between circuit-breakers side by
side and one top another (if any)
10 For withdrawable circuit-breakers: racking
-in/out device
Procedure
Carry out some opening and closing operations
(see the chapter 7.
The circuit-breaker closes correctly. The signal changes
over.
CAUTION
When there undervoltage release, the
circuit-breaker can only closed after the
release has been electrically energized.
Item inspected
1 Manual operating mechanism
2 Geared motor (if any)
3 Undervoltage release
(if any)
4 Shunt opening release (if any)
5 Shunt closing release (if any)
6 Circuit-breaker lock the open position
(with key padlocks)
7 Auxiliary contacts the circuit-breaker
8 Auxiliary contacts for signalling circuit-
breaker connected, test isolated and
disconnected
9 vice irc it-b rs
connected and disconnected.
The circuit-breaker opens correctly.
Positive check
The spring loading lever moves correctly.Putting into service
6.
Carry out the operating tests.
Open the circuit-breaker. Carry out some circuit-breaker closing
and opening operations.
Open the circuit-breaker, turn the key and
remove from its seat.
Supply the shunt opening release the
corresponding rated voltage.
Supply the shunt closing release its rated
voltage. The
signals are correct.
The signals are given correctly. Attempt circuit-breaker
closing operation. The signals
are correct.2).
The locks function correctly.
Racking-in operation: the circuit-breaker racks
in correctly.
The geared motor reloads the springs after
each closing operation.
Supply the spring loading geared motor the
corresponding rated voltage.
The geared motor stops with the springs
loaded.
The circuit-breaker opens. Supply the undervoltage release the
corresponding rated voltage (if any). The first turns the crank handle
do not meet with particular resistance.
The circuit-breaker closes correctly. The signals
are correct.
The signals are correct.
Insert the auxiliary contacts suitable signalling
circuits. Then put the circuit-breaker the
connected, test isolated and disconnected
position.
S upply the undervoltage release the
corresponding rated voltage and carry out the
circuit-breaker closing operation.
Insert the auxiliary contacts suitable signalling
circuits.
Close the circuit-breaker.
Both anual and electrical closing are
prevented.
The springs are loaded correctly.
14/1 08
.
S upply the undervoltage release the
corresponding rated voltage and carry out the
circuit-breaker closing operation.
Disconnect voltage the release.
Model L3447
A pparatus Emax DC
S cale
D oc-N 1SDH000635R0002
Page No.1 eneral res
- Check tightness the power connections the circuit-breaker terminals
- Carry out all the preparatory operations the release
- Make sure that the value the auxiliary circuit power supply voltage between and 110% the rated voltage the electrical applications
- Make sure that there adequate air circulation the place installation avoid overheating
- Also carry out the checks specified the following table.
C arry som sin and g
operations.
Note
