Advertisement
PART B Installation, Operation & Maintenance
5. Commissioning:
5.1 General Procedures
All the activities concerning commissioning of the breakers must be
carried out by ABB personnel or customer personnel who are suitably
!
!
qualified and have an in-depth knowledge of the apparatus & installation.
If the operations are disbled, do not force the mechanical interlocks,
but check that the operation sequence is correct
Before putting the circuit-breaker into service carry out the
following operations.
Check the tightness of the power connection on the circuit
breaker terminals.
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.
Subject of
inspection
Insulation
Medium voltage circuits
Resistance
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 measure the
insulation resistance between the
auxiliary circuits and the exposed
conductive part
Auxiliary
Check that the connections to the
Circuits
control circuit are correct; and the
supply voltage is correct .
Manually
Carry out a few closing and opening
charged
operations (see chap. 6).
operating
N.B. Give rated auxiliary supply to the
mechanism
u/v release on the
operating mechanism (if provided).
Motor
Give rated auxiliary supply to the
charged
geared motor for spring charging
operating
mechanism
Carry out a few closing and opening
operations. N.B. Give rated auxiliary
supply to the under-voltage release
on the operating mechanism
(if provided).
Procedure
Check that no foreign body, such as
packing material, has got into the moving
parts
Check correct setting of the thermostat (0 C)
Also carry out the checks indicated in
the following table
Positive check
The insulation resistance should be
at least 200 Meg. ohm and, in any case,
constant in time.
The insulation resistance should be a
few Mohm and, in any case, constant
in time.
The connections are according to the
electric diagram enclosed with the
circuit-breaker.
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.
27
o
Advertisement
