VD4/R - VD4/L - VD4/R-SEC - VD4/L-SEC
- INSTALLATION AND OPERATING INSTRUCTIONS
26
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8. Putting into service
All the operations for putting into service
must be carried out by ABB personnel or by
the customer’s qualified personnel.
If the operations are obstructed, do not
force the mechanical interlocks and check
that the operating sequence is correct.
The operating forces which can be applied
are indicated in paragraph 6.3.
Discharge the closing springs (close and
open the circuit breaker) to access the
inside of the operating mechanism.
Disconnect the PR521 release (if provided)
before conducting insulation tests on the
circuit breaker.
8.1 General procedures
Before putting into service the circuit breaker,
perform the following operations:
•
check the tightness of the power connections at
the switch terminals;
•
establish the calibration of the electronic
primary overcurrent release (if provided);
•
check that the value of the auxiliary circuit
power supply voltage is included for a.c between
85% and 110% and for c.c. between 70% and
110% of the rated voltage of electrical
applications;
•
check that no foreign objects such as packaging
residues have penetrated the moving parts;
•
check that sufficient air exchange is ensured in
the place of installation to avoid overheating;
•
As manufacturers we recommend, in accordance
with section 8.104 of the IEC 62271-200
standard, to carry on the additional power-
frequency voltage test at 80% of the test
voltage indicated in table 1 and table 2 of the
IEC 62271-1 standard, when required;
•
perform the checks shown in the following table:
Subject of the inspection
Procedure
Positive check
1
Insulation resistance.
Medium voltage circuit
Using a 2500 V Megger, measure the insulation
resistance between the phases and between
phases and earth the circuit.
The insulation resistance should be at least 50 MΩ
and must remain constant over time.
Auxiliary circuits
Using a 500 V Megger (installed equipment
permitting), measure the insulation resistance
between the auxiliary circuits and the earth.
The insulation resistance should be several MΩ and
must remain constant over time.
2
Auxiliary circuits
Make sure that the connections to the control
circuit are correct: proceed with the relative
power supply.
Normal operations and signals.
3
Manual operating mechanism.
Perform a few closing and opening operations
(see chap. 6).
NOTE. Power the undervoltage release and the
locking magnet on the operating mechanism at
the relative rated voltage (if provided).
The operations and relative signals occur correctly.
4
Motor operator (if provided).
Power the spring loading gearmotor at the
relative rated voltage.
The springs are loaded correctly.
The signals are correct.
The gearmotor stops when the springs have been
loaded.
Perform a few closing and opening operations.
NOTE. Power the undervoltage release and the
locking magnet on the operating mechanism at
the relative rated voltage (if provided).
The gearmotor reloads the springs after each
closing operation.
5
Undervoltage release (if provided).
Power the undervoltage release at the relative
rated voltage and perform the circuit breaker
closing operation.
The circuit breaker closes correctly.
The signals are correct.
Disconnect the power supply to the release.
The circuit breaker opens.
The signal changes over.
6
Shunt opening release and additional
shunt opening release (if provided).
Close the circuit breaker.
Power the shunt opening release at the relative
rated voltage.
The circuit breaker opens correctly.
The signals are correct.
7
Shunt closing release (if provided).
Open the circuit breaker. Power the shunt closing
release at the relative rated voltage.
The circuit breaker closes correctly.
The signals are correct.
8
Key lock.
Open the circuit breaker, keep the opening
pushbutton depressed, then turn the key and
remove it from the housing.
Attempt the circuit breaker closing operation.
Neither manual nor electric closing takes place.
Insert the key again and turn it through 90°.
Perform the closing operation.
Both electric and manual closing take place correctly;
in this position the key cannot be removed.
9
Auxiliary contacts in the operating
mechanism.
Insert the auxiliary contacts into suitable
signalling circuits.
Perform a few closing and opening operations.
The signals occur correctly.
