Operation Principle - ABB RELION 630 Series Technical Manual

Section 7
Power management functions
7.8.4
278
This function also allows the manual load-shedding action that can be executed by the
operator based on power or priority.
This function generates the trip information for sheddable loads in the corresponding
subnetworks based on the calculated load shed priority. This function reports the load
shed trip information of individual sheddable loads to the corresponding load shed trip
command function LSPTRC
This function blocks the load-shedding action in the subnetworks if the load shed
blocking signals are activated by power sources, network circuit breakers or activation
of external input.
This function calculates the spinning reserve and must shed information of the
subneworks to share with connected adjacent electrical areas. This information is
provided to the corresponding peer-to-peer load-shedding function PPLSGGIO.
This function reports the various load-shedding information of the subneworks to the
corresponding subnetwork output function SNWRCLS for display.

Operation principle

The Operation setting is used to enable or disable the function. The corresponding
parameter values are "On" and "Off". The operation of LSCACLS can be described by
using a module diagram. All the modules in the diagram are explained in the next
section.
1MRS757256 F
PML630/Compact Load-Shedding Solution
Technical Manual