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8. Putting into service
8.1. General procedures
All the operations for putting into service must be carried
out by ABB personnel or by customer’s qualified person-
nel.
Should the operations be prevented, do not force the me-
chanical interlocks and check that the operation sequence
is correct.
The operating forces which can be applied are indicated in
paragraph 6.3.
To access the inside of the operating mechanism, discharge
the closing springs (close and open the circuit-breaker).
Before carrying out insulation tests on the circuit-breaker,
disconnect the PR521 release (if provided).
PROCEDURE
Medium voltage circuit
With a 2500 V Megger, measure the insulation resistance be-
tween the phases and between phases and exposed
conductivepart of the circuit.
Auxiliary circuits
With a 500 V Megger (installed equipment permitting) measure
the insulation resistance between the auxiliary circuits and the
exposed conductive part.
Check that the connections to the control circuit are
correct;proceed with relative power supply.
Carry out a few closing and opening operations (see chap. 6).
N.B.
Supply the U/V release and the locking magnet on the
operating mechanism at the relative rated voltage (if provided).
Supply the geared motor for spring charging at the relative
rated voltage.
Carry out a few closing and opening operations.
N.B.
Supply the undervoltage release and the locking magnet
on the operating mechanism at the relative rated voltage (if
provided).
Supply the undervoltage release at the relative rated voltage
and carry out the circuit-breaker closing operation.
Disconnect the power supply to the release.
Close the circuit-breaker.
Supply the shunt opening release at the relative rated voltage.
Open the circuit-breaker. Supply the shunt closing release at
the relative rated voltage.
Turn the key and remove it.
Attempt the circuit-breaker closing operation.
Insert the key again and turn it 90°.
Carry out the closing operation.
Insert the auxiliary contacts into suitable signalling circuits.
Carry out a few closing and opening operations.
POSITIVE CHECK
The insulation resistance should be at
least 50 M
Ω
and, in any case, constant
over time.
The insulation resistance should be a few
M
Ω
and, in any case, constant over time.
Normal operations and signals.
The operations and relative signals occur
correctly.
The springs are charged correctly.
The signals are correct.
The geared motor stops when the springs
are charged.
The geared motor recharges the springs
after each closing operation.
The circuit-breaker closes correctly.
The signals are correct.
The circuit-breaker opens.
The signal changes over.
The circuit-breaker opens correctly.
The signals are correct.
The circuit-breaker closes correctly.
The signals are correct.
Neither manual nor electric closing takes
place.
Both electric and manual closing take place
correctly; in this position the key cannot
be removed.
Signals occur correctly.
1
SUBJECT OF THE INSPECTION
Insulation resistance.
Auxiliary circuits.
Manual operating mechanism.
Motor operator(if provided)
Undervoltage release(if provided).
Shunt opening release and addi-
tional shunt opening release (if pro-
vided).
Shunt closing release
(if provided).
Key lock.
Auxiliary contacts in theoperating
mechanism.
Before putting the circuit-breaker into service, carry out the following
operations:
– check tightness of the power connections to the circuit-breaker termi-
nals;
– establish the setting of the primary electronic overcurrent release (if
provided);
– check that the value of the power supply voltage of the auxiliary cir-
cuits is between 85% and 110% for a.c. and between 70% and 110%
for d.c. of the rated voltage of the electrical accessories;
– check that no foreign bodies, such as bits of packing, have got into the
moving parts;
– check that there is a sufficient exchange of air in the place of installa-
tion to avoid overtemperatures;
– also carry out the checks indicated in the following table:
2
3
4
5
6
7
9
8
