Manual Ls Selection; Subnetwork Priority Calculation - ABB RELION 630 Series Technical Manual

1MRS757256 F
7.8.4.5
7.8.4.6
PML630/Compact Load-Shedding Solution
Technical Manual

Manual LS selection

This module calculates manual load-shed priority and manual load-shed power for
each subnetwork.
Table 325 shows the manual load-shedding priority and manual load-shedding power
calculated for subnetwork z and the MAN_LS_BEH output.
Table 325: Calculation of manual LS priority, manual LS power and MAN_LS_BEH output
Man load-shed mode Calculated manual LS
setting priority
(MAN_SHD_PRIO
Disable manual LS 0
SN Man Prio setting SubNetw<z> Man Prio
setting
SN Man Pow setting 0
SN Man Prio input Input
MAN_PRIO_SN<z>
SN Man Pow input 0
If the Man load shed mode setting is "SN Man Prio input" and
MAN_LS_QVAL is FALSE, the manual LS priority is the same as the
SubNetw<z> Man Prio setting and MAN_LS_BEH output set to "Set
Prio Comm bad".
Similarly, if the Man load shed mode setting is "SN Man Pow input"
and MAN_LS_QVAL is FALSE, the manual LS power is the same as
the SubNetw<z> Man Pow setting and MAN_LS_BEH output set to
"Set power Comm bad".
The MAN_LS_BEH output is provided in the monitoring view.
The calculated manual LS priority MAN_LS_POW
are reported to the Subnetwork priority calculation module.
MAN_LS_PRIO
z

Subnetwork priority calculation

This module calculates the load-shedding priority for a subnetwork.
Disable LS SubNetw setting disables the load-shedding of all the four subnetworks.
Enable LS SubNetw1 .. Enable LS SubNetw4 settings enables the load-shedding in an
individual subnetwork.
If Disable LS SubNetw setting = "Yes", the load-shedding is disabled in all four
subnetworks else the load-shedding is enabled or disabled according to Enable LS
SubNetw1, Enable LS SubNetw2, Enable LS SubNetw3 and Enable LS SubNetw4
settings.
Power management functions
Calculated manual LS
power
) (MAN_SHD_POW )
z z
0
0
SubNetw<z> Man Pow
setting
0
Input
MAN_POW_SN<z>
and manual LS power
z
Section 7
Output MAN_LS_BEH
Manual LS disable
Manual Prio setting
Manual power setting
Communicate priority
Communicate power
289