9
We strongly recommend use of unbalanced load protection
(together with other standard protections tailored to suit the
system) that functions when the upstream circuit breaker trips
if the load is not balanced on the three phase system.
The capacitor bank unbalanced protection layout shown above
is strongly recommended because allows a capacitor with im-
paired performance to be identified, thereby reducing the im-
pact of a capacitor bank fault.
Operating Conditions:
DS1 is designed for indoor applications. The following operat-
ing conditions apply:
Maximum Operating Temperature of DS1: -15 °C +55 °C
Note
: The pressure inside the device depends on the temperature.
However, DS1 has been tested at minimum pressure.
Please note that if unlikely circumstances occurs (temperature variation in the filling
stage and tolerance of the pressure meter) when DS1 is operating at minimum
temperature (-15 °C), the pressure could drop to a value able to trigger the warning
level.
However, functionality at the DS1 pressure warning level of is fully ensured.
The device stops operating at blocking pressure.
Relative Humidity 93%
DS1 has been designed to work in indoors where the relative
humidity is high.
The design technique includes conformal coating of all elec-
tronic boards inside the control system.
In addition, vertical positioning of the electronic components is
another important feature with regard to humidity during opera-
tion.
The apparatus has been tested for up to 93% relative humidity
both when it is operating and not operating.
However, as in every indoor device, to prevent condensation
from forming, rapid temperature changes should be mitigated
in particular cases where the temperature drops very quickly in
conjunction with high relative humidity. This precaution must
always be considered when MV applications are present, be-
cause condensation may form in any part of the compartment.
Lastly, pre-conditioning in a controlled environment should be
performed before using DS1 when it has been stored for a long
period in an uncontrolled environment.
Altitude <1000 m
Provided
by
Northeast
Power
Systems,
Inc.
(NEPSI)
