Putting Into Service - ABB VD4 36 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 by
suitably qualified customer personnel with in-depth
knowledge of the apparatus and of the installation.
Should the operations be prevented, do not force
the mechanical interlocks and check that the
operating sequence is correct.
The operating forces which can be applied for
racking-in withdrawable circuit-breakers are
indicated in paragraph 7.5.
T3
ITEM INSPECTED
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 (-RL1)
(if provided).
10 Auxiliary contacts in the
operating mechanism.
11 Locking electromagnet on the
truck circuit-breaker (-RL2)
(if provided).
12 Auxiliary transmitted contacts
for signalling circuit-breaker
racked-in, isolated (UniGear
switchgear of PowerCube
modules).
21
PROCEDURE
Medium voltage circuit
With a 2500 V megger, measure the insulation resistance
between the phases and the exposed conductive part of the
circuit.
Auxiliary circuits
With a 500 V megger (if the apparatus installed allows this),
measure the insulation resistance between the auxiliary circuits
and the exposed conductive part.
Check that the connections to the control circuit are correct:
proceed at the relative power supply.
Carry out a few closing and opening operations (see cap. 6).
N.B. Supply the undervoltage release and the locking magnet
on the operating mechanism at the relative rated voltage
(if provided).
Supply the spring charging geared motor 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.
Cut off power to the release.
Close the circuit-breaker and supply the shunt opening release
at the relative rated voltage.
Open the circuit-breaker and supply the shunt closing release at
the relative rated voltage.
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.
Put the key back in and turn it 90°.
Carry out the closing operation.
With the circuit-breaker open, spring charged and locking
electromagnet not supplied, attempt circuit-breaker closing both
manually and electrically.
Insert the auxiliary contacts in suitable signalling circuits.
Carry out a few closing and opening operations.
With the circuit-breaker open, in the isolated for test position
and the locking electromagnet not supplied, attempt racking-in
of the circuit-breaker.
Supply the locking electromagnet and carry out the racking-in
operation.
Insert the auxiliary contacts in suitable signalling circuits.
With the circuit-breaker racked into the enclosure, carry out a
few traverse operations from the isolated for test position to the
connected position.
Take the circuit-breaker to the racked-out position.
Before putting the circuit-breaker into service, carry out the
following operations:
– check tightness of the power connections to the circuit-
breaker terminals;
– establish the setting of the primary electronic overcurrent
release (if provided);
– check that the value of the power supply voltage of the
auxiliary circuits is between 85% and 110% 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
installation place to avoid overtemperatures;
– also carry out the checks indicated in table T3.
POSITIVE CHECK
The insulation resistance should be at least 50
Mohm and in any case constant over time.
The insulation resistance should be a few
Mohm and in any case constant over time.
Operations and signals normal.
The operations and relative signals take place
normally.
The spring is charged normally.
The signals are normal.
With the spring charged, the geared motor
stops.
The geared motor recharges the spring after
each closing operation.
The circuit-breaker closes normally.
The signals are normal.
The circuit-breaker opens.
The signalling changes over.
The circuit-breaker opens normally.
The signals are normal.
The circuit-breaker opens normally.
The signals are normal.
Neither manual nor electrical closing takes
place.
Both electrical and manual closing take place
normally; in this position the key cannot be
removed.
Closing is not possible.
Signals take place normally.
Racking-in is not possible.
Racking-in takes place correctly.
The signals due to the relative operations take
place normally.