Compensated Cb Status; Load Inhibit Logic - ABB RELION 630 Series Technical Manual

Section 7
Power management functions
7.5.4.2
7.5.4.3
Table 281: Calculation of the L1_INHIBIT output
Cause of inhibition of sheddable load L1_INHIBIT output
A = setting Inhibit L1 is Active
A= input CB_POS_L1 is Open and
input POWER_L1 ≠ 0 (within
measurement cycle)
A = input CB_POS_L1 is Open and
input POWER_L1 ≠ 0 (at
measurement cycle)
Table continues on next page
238
Table 280: Unit conversion of power for the sheddable load1
Power convention L1 setting
W
kW
MW

Compensated CB status

This module calculates the compensated CB status for sheddable load1. The
L1_CB_COMPS output provides the compensated CB status for sheddable load1.
The conditions to set the L1_CB_COMPS output as "Close".
• The input CB_POS_L1 (sheddable load1 circuit breaker position) is "Close".
• The input IED_QVAL_L1 (sheddable load1 IED data quality) is "Good".
When either of the above conditions are not met, L1_CB_COMPS output is "Open".

Load inhibit logic

The sheddable load1 can be inhibited by an operator based on the Inhibit L1 setting.
The sheddable load1 can be inhibited by a system based on various conditions as
shown in the Table 281.
If the sheddable load1 is not inhibited by the system or operator, the L1_INHIBIT
output is "Not Inhibit".
L1_INHIBIT = Operator Inhibit
1
A
0
T
1
L1_INHIBIT
0
GUID-841986AB-BA79-48C4-876B-C0B6E2E49437 V1 EN
L1_INHIBIT = Not Inhibit
1
A
0
T
1
L1_INHIBIT
0
GUID-DFDD737D-2B49-4600-A837-8237CF18C804 V1 EN
Input
POWER_L1
POWER_L1
POWER_L1
2T
3 T
At the instance of measurement cycle
2 T
3 T
L1_INHIBIT="System inhibit"
1MRS757256 F
L1_POWER output
POWER_L1 × [0.001]
POWER_L1 × [1]
POWER_L1 × [1000]
5T
4 T
5 T
4 T
PML630/Compact Load-Shedding Solution
Technical Manual