Shed Priority Logic - ABB RELION 630 Series Technical Manual

1MRS757256 F
Cause of inhibition of sheddable load L1_INHIBIT output
A = input IED_QVAL_L1 is Bad
(within measurement cycle)
A = input IED_QVAL_L1 is Bad (at
measurement cycle)
A = input IED_TEST_L1 is TRUE or
input EXT_INH_L1 is TRUE or input
CB_POS_L1 is Intermediate or
Invalid
T, 2T, 3T are the measurement cycles.
7.5.4.4
PML630/Compact Load-Shedding Solution
Technical Manual
1
A
0
0 T
1
L1_INHIBIT
0
L1_INHIBIT="System inhibit"
GUID-8449C37E-29B5-4EEF-A469-85ACDDAD2EFD V1 EN
1
0
A
0 T
1
L1_INHIBIT
0
GUID-B33FD3AD-5E3A-494F-AA05-CDB4556CA3C1 V1 EN
L1_INHIBIT = System Inhibit
If the sheddable load1 is inhibited by the system and operator at the
same time, the output L1_INHIBIT is "Operator Inhibit".
The calculated L1_INHIBIT output is available for the monitoring view and
reported to the Shed priority logic module.

Shed priority logic

This module calculates the shed priority of a sheddable load based on the system or
operator inhibition. The Priority L1 setting sets the priority of the sheddable load1.
The Priority L1 value ranges from 1 to 19, where 1 is the lowest important sheddable
load and 19 is the highest important sheddable load. The priority setting is also
available as the L1_SHED_PRIO output for the monitoring view.
The priority setting is effective only if the sheddable load is not
inhibited by the system or operator.
The priorities of the sheddable load1...5 can be monitored as output PRIO_L1_5 and
sheddable load6...10 can be monitored as output PRIO_L6_10 coded integer (32 bit)
form.
Each sheddable load priority is represented by 5-bit information as shown in
282.
Power management functions
2T
3 T
2T
3 T
L1_INHIBIT="System inhibit"
Section 7
5 T
4 T
5T
4 T
Table
239