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7. Commissioning
7.1 General procedures
All the commissioning operations must
be carried out by ABB personnel or the
customer’s suitably qualified personnel with
in-depth knowledge of the apparatus and
installation.
If the operations are obstructed in some way,
do not force the mechanical interlocks but
check that the operating sequence is correct.
Perform the following operations before putting the apparatus
into service:
− Make sure that the power connections to the apparatus ter-
minals have been properly tightened;
− Make sure that the value of the supply voltage for the auxil-
iary circuits is within 85% and 110% of the rated voltage of
the electrical devices;
− Check that there are no foreign bodies, such as packaging,
between the moving parts;
− Check that air circulation in the apparatus installation site is
adequate and that there is no danger of overheating.
Perform the inspections listed in the following table:
Subject of the
Inspection
Procedure
Positive check
Insulation
Resistance
Medium Voltage Circuits
Using a 2500 V Megger,
measure the insulation
resistance between the
phases and exposed con-
ductive parts of the circuit
The isolation resistance
should be at least 50MOhm
and in any case, be
constant over time
Auxiliary Circuits
Using a 500 V Megger
(installed equipment
permitting), measure
the insulation resistance
between the auxiliary
circuits and the exposed
conductive parts
The isolation resistance
should be at least a few
MOhm and in any case,
be constant over time
Auxiliary Control
Circuits
Make sure that the
connections to the control
circuits are correct. Supply
the circuits
Normal switching and
signaling
Maintenance
Mode Operations
Perform closing and
opening operations (see
commissioning section)
The operations and relative
signals occur correctly as
indicated in the commis-
sioning section
Auxiliary Circuits Connect the auxiliary
switch to suitable signaling
circuits. Supply the circuit
and perform closing and
opening operations
Normal switching and
signaling occur correctly
Table 6. General commissioning verifications
7.2 Startup and maintenance features
As shown in the electrical terminal block (ANNEX A) and
described in the previous sections, DS1 provides a simple
interface comprising the following binary input:
Upstream Circuit Breaker (CB) Interlock
Allows the switch to operate even if the system is not energized
(and consequently not synchronized) by exciting the input.
Allows the Homing procedure to activate (the DS1 switch
initializes its position in the Open condition).
Misuse of this function can prevent DS1
from functioning correctly (upstream Circuit
Breaker (CB) Interlock not deactivated after
commissioning).
ABB recommends coordination with an
auxiliary switch indicating the CB status.
When the upstream Circuit Breaker status
is provided directly by the operator, ABB
recommends installation of a safety key lock.
Key activation must be managed carefully
because this operating option must only be
used in the de-energized condition (during
commissioning and maintenance).
ABB declines all liability for loss of system
integrity due to misuse of the upstream CB
interlock function.
Reset Push button
Can be used to reset a fault when this concerns system integ-
rity or bad behavior during operations. The alarm led goes out
when a reset is accepted by the system.
If the ready condition is not restored, the Homing command is
required to recover full functionality.
Use of the Reset feature is not recommended when the system
is energized without ABB’s authorization, since when an Alarm
Trip occurs, it means that faulty operation of the system has
been detected during actuation.
Note: DS1 is equipped with an event recorder. This means that
ABB is always able to detect misuse of this function.
Homing
Allows the position of the system to be initialized in the open
position. The Homing procedure produces an effect when:
− the system is not in the open position
− a Reset command has been accepted by the system (the
alarm lamp turns OFF after the Reset pushbutton has been
pressed)
− upstream CB interlock feedback is enabled by the upstream
CB Interlock status (or a Key Protected Command).
Provided
by
Northeast
Power
Systems,
Inc.
(NEPSI)
