InteliMains
NT
, SW version 3.2.0
InteliMains-NT-MCB-MGCB-3.2.0-Reference Guide.pdf,
©ComAp – April 2015
158
gen-sets. Non-standard functions presented by this setpoint are especially
useful for multimains systems where a group of gen-sets supplies more loads.
STANDARD
The MGCB is opened at the moment when
value is lower than
or after
elapsed. Because of preventing potential oveloading
of gen-sets (see example below) there are two different
settings for MGCB-opening behavior which utilize auxiliary
current measurement and thus prevent potentialy
dangerous situations.
E
XAMPLE
:
For this example we will use Figure below. The upper
mains incomer is feeding both loads and gen-set G1 is
unloading (MCB1 is closed, MGCB1 is closed, GCB1 is
closed, MCB2 is opened, MGCB2 is closed, GCB2 is
opened). If standard SOFT UNLOAD behavior is used
than MGCB1 is opened (after conditions mentioned above
are fulfilled) and this leads to direct connection of G1
(unloaded but running gen-set) to the second load
suddenly (very high load step may occur).
A
UX
CTG
EN
Auxiliary current measurement (AUX CURRENT terminal)
can be used to measure actual current through MGCB.
This enables regulation of the incoming power from the
Mains and from the gensets in the way that gensets stop
supplying respective load but continue supplying other
load in the system. The CT is expected to be placed
between MGCB and bus and must be connected to L3.
The MGCB is opened when the power over MGCB
counted from this auxiliary current and voltage is lower
than
or after
A
UX
CTL
OAD
Auxiliary current measurement (AUX CURRENT terminal)
can be used to measure actual current to the load. This
enables regulation of the incoming power from the Mains
