ABB hd4 Installation And Service Instructions Manual - page 32
32
8.1. General procedures
All the operations regarding putting into service
must be carried out by ABB personnel or customer
personnel who are suitably qualified and have
an in-depth knowledge of the apparatus and
installation.
If the operations are prevented, do not force the
mechanical interlocks, but check that the operation
sequence is correct.
The operating forces which can be applied are
indicated in paragraph 6.3.
Subject of the inspection
Procedure
Positive check
1
Insulation resistance.
Medium voltage circuits
With a 2500 V Megger, measure the insulation resistance
between phases and exposed conductive part of the circuit.
The insulation resistance should be at least 50 M
Ω
and, in any case, constant in time.
Auxiliary circuits
With a 500 V Megger (installed equipment permitting)
measure the insulation resistance between the auxiliary
circuits and the exposed conductive part.
The insulation resistance should be a few M
Ω and,
in any case, constant in time.
2
Auxiliary circuits.
Check that the connections to the control circuit are
correct; proceed with relative supply.
Normal switchings and signallings
3
Manual operating
mechanism.
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).
The operations and relative signals occur correctly.
4
Motor operator (if
provided)
Supply the geared motor for spring charging at the relative
rated voltage.
The springs are charged correctly.
The signals are correct.
The geared motor cuts off when the springs are
charged.
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).
The geared motor recharges the springs after each
closing operation.
5
Undervoltage release (if
provided).
Supply the undervoltage release at the relative rated voltage
and carry out 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.
Supply 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. Supply the shunt closing release
at the relative rated voltage.
The circuit-breaker closes correctly.
The signals are correct.
8
Key lock (if provided).
Open the circuit-breaker.
Turn the key and remove it.
Attempt the circuit-breaker closing operation.
Neither manual nor electric closing takes place.
Insert the key again and turn it 90°.
Carry out the closing operation.
Both electric and manual closing take place
correctly; in this position the key cannot be
removed.
9
Locking electromagnet
(YL1) (if provided).
With the circuit-breaker open, springs charged and locking
electromagnet not supplied, attempt to close the circuit-
breaker both manually and electrically.
Closing is not possible.
10
Auxiliary contacts in the
operating mechanism.
Insert the auxiliary contacts into suitable signalling circuits.
Carry out a few closing and opening operations.
Signals occur correctly.
Before putting the circuit-breaker into service carry out the
following operations:
– check the tightness of the power connections on the circuit-
breaker terminals;
– establish the setting of the direct solid-state overcurrent
release (if provided);
– check that the value of the supply voltage for the auxiliary
circuits is within 85% and 110% of the rated voltage of the
electrical devices;
– check that no foreign body, such as packaging, has got into
the moving parts;
– check that air circulation in the circuit-breaker installation
site is adequate so that there is no danger of overheating;
– carry out the checks indicated in the following table:
8. Putting into service