Putting Into Service - ABB hd4 Installation And Service Instructions Manual

8.

Putting into service

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
1 Insulation resistance.
2 Auxiliary circuits.
3 Manual operating
mechanism.
4 Motor operator (if
provided)
5 Undervoltage release (if
provided).
6 Shunt opening release
and additional shunt
opening release (if
provided).
7 Shunt closing release (if
provided).
8 Key lock (if provided).
9 Locking electromagnet
(YL1) (if provided).
10 Auxiliary contacts in the
operating mechanism.
32
Procedure
Medium voltage circuits
With a 2500 V Megger, measure the insulation resistance
between phases and exposed conductive part 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 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.
Open the circuit-breaker.
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.
With the circuit-breaker open, springs charged and locking
electromagnet not supplied, attempt to close the circuit-
breaker both manually and electrically.
Insert the auxiliary contacts into suitable signalling circuits.
Carry out a few closing and opening operations.
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:
Positive check
The insulation resistance should be at least 50 MΩ
and, in any case, constant in time.
The insulation resistance should be a few MΩ and,
in any case, constant in time.
Normal switchings and signallings
The operations and relative signals occur correctly.
The springs are charged correctly.
The signals are correct.
The geared motor cuts off 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.
Closing is not possible.
Signals occur correctly.