InteliMains
NT
, SW version 3.0
InteliMains-NT-BTB-3.0-Reference Guide.pdf, ©ComAp – June 2013
12.2.6.12 Setpoint: BusLeft <f
This setpoint adjusts the threshold level for the busL underfrequency
protection. The threshold is adjusted in % of the buses' system frequency
which is given by Nominal Freq and its offset Nom frq offset.
The protection activates if the frequency in phase L3 drops below the
threshold for time longer than BusLeft f del.
NOTE:
The busL underfrequency protection is History record type - for more
information on protection types please refer to alarm types section.
12.2.6.13 Setpoint: BusLeft f del
This setpoints determines the delay for busL under- (defined by BusLeft <f)
and overfrequency (defined by BusLeft >f) protections.
NOTE:
Although the resolution of this setpoint is 0.01s, in fact the adjusted delay is
rounded to the next higher multiple of the period of the generator voltage.
The period is either 0.02s for 50Hz systems or 0.0166s for 60Hz systems.
E.g. if the delay is set to 0.03s at 50Hz system the real delay will be 0.04s.
12.2.6.14 Setpoint: BusMeasErrLR
NOTE:
Althought this setpoint is located in BusL protect it is valid for both busL and
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