ABB Relion 630 Series, Technical Manual

Page: 244 / 380

Table 280: Unit conversion of power for the sheddable load1
Power convention L1 setting Input L1_POWER output
W POWER_L1 POWER_L1 × [0.001]
kW POWER_L1 POWER_L1 × [1]
MW POWER_L1 POWER_L1 × [1000]
7.5.4.2 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".
7.5.4.3 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".
Table 281: Calculation of the L1_INHIBIT output
Cause of inhibition of sheddable load L1_INHIBIT output
A = setting Inhibit L1 is Active L1_INHIBIT = Operator Inhibit
A= input CB_POS_L1 is Open and
input POWER_L1 ≠ 0 (within
measurement cycle)
0
T 2T
3 T
4 T
5T
L1_INHIBIT
A
0
1
1
GUID-841986AB-BA79-48C4-876B-C0B6E2E49437 V1 EN
L1_INHIBIT = Not Inhibit
A = input CB_POS_L1 is Open and
input POWER_L1 ≠ 0 (at
measurement cycle)
L1_INHIBIT
0
T
2 T
3 T 4
T
5 T
A
0
1
1
At the instance of measurement cycle
L1_INHIBIT=”System inhibit”
GUID-DFDD737D-2B49-4600-A837-8237CF18C804 V1 EN
Table continues on next page
Section 7
1MRS757256 F
Power management functions
238 PML630/Compact Load-Shedding Solution
Technical Manual