InteliMains
NT
, SW version 3.2.0
InteliMains-NT-MCB-MGCB-3.2.0-Reference Guide.pdf, ©ComAp – April 2015
11.2.6.18 Setpoint: ROCOF df/dt
This setpoint adjusts the trip level for ROCOF protection (Rate Of Change Of
Frequency). The "filtration level" for the ROCOF protection is adjusted by
setpoint ROCOF Win.
NOTE:
If measured value of df/dt exceeds ROCOF df/dt, ROCOF protection is
activated. The message ROCOF is writen in history of controller and
corresponding logical binary output is activated ROCOF Trp. Value of df/dt is
evaluated from mains voltage.
NOTE:
To activate or deactivate ROCOF protection, please use ROCOF prot.
Choose proper breaker which will be opened if ROCOF protection activates
by adjusting setpoint VS/ROCOF CBsel.
11.2.6.19 Setpoint: Mains V unbal
This setpoint defines the threshold level for Mains voltage unbalance
protection. The voltage unbalance is calculated as a maximum difference
between phase voltages. This protection is evaluated with delay given by
Mains Vunb del.
11.2.6.20 Setpoint: Mains Vunb del
This setpoint adjusts delay for mains voltage unbalance alarm (see Mains V
unbal).
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