3
IMPORTANT
DS1 is a special purpose capacitor switch
specifically designed to manage capacitive
loads. DS1 is not designed to perform any
safety function.
When a DS1 is installed in a system, the
safety functions must be provided by
system integration.
There must always be at least one
upstream protection (e.g. a circuit breaker)
and preferably also a second level of
protection (e.g. fuses).
Maintenance must not be performed when
the system is energized by the MV supply.
In addition, coordination or security keys
must always be present to prevent operator
errors from causing the device to function
in a situation for which it is not designed
(e.g. closing on a grounded capacitor).
In general, especially when large capacitor
banks are operated, the power involved,
the danger of electrical phenomena and
the impact of a potential failure on the
capacitor bank make it very dangerous to
remain near the live equipment (especially
during transients).
Use of compartments able to contain the
internal arc in case of failure are recom-
mended.
Work performed by operators in rooms
housing live equipment containing capaci-
tors or operating means is always strongly
discouraged.
DS1 internally creates an auxiliary voltage
bus at 350 VDC. Additional energy is stored
inside a capacitor. Maintenance must
not be performed when DS1 is supplied
and when electrical equipment must be
touched (apparatus or internal auxiliary
equipment). After system shut down wait at
least one minute (until the control system
consumes the energy stored inside the
internal capacitor) for the control system
to shut down (internal leds turn off) before
touching any of the electrical equipment.
Additional precautions for the internal
capacitor must be observed, especially if
it has been disconnected by the control
system or if maintenance is performed
for a suspected a control system failure.
When performing this operation, always
use all mandatory safety PPE for electrical
maintenance.
Safety
For your safety!
Make sure that the installation site (spaces, divisions and
ambient) is suitable for the electrical apparatus.
Check that all the installation, putting into service and
maintenance operations are carried out by qualified personnel
with in-depth knowledge of the apparatus.
To ensure that the installation conforms to the rules of good
working practice and safety in the workplace, make sure that
the standard and legal prescriptions are complied with during
the installation work, putting into service and maintenance
operations.
Strictly comply with the information given in this instruction
manual.
Do not exceed the rated performance of the apparatus during
service.
Pay special attention to the danger notes indicated in the
manual by the following symbol:
Make sure that the personnel operating the apparatus are
provided with this instruction manual as well as all the necessary
information for correct operation.
Responsible behaviour safeguards your own and others’
safety!
Please contact the ABB assistance service for any requests.
Provided
by
Northeast
Power
Systems,
Inc.
(NEPSI)