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If multiple load-shed triggers are activated at the same time, the cause of load-shed
corresponds to the lowest preference number.
If priority-based manual load-shed action is performed along with any
other trigger getting activated at the same instance, the cause of load-
shed is manual load-shed provided manual load-shed priority is
greater than the load-shed priority calculated due to any other trigger
for the subnetwork z.
If slow load-shed trigger is active along with any other trigger at the
same instance, the cause of load-shed is slow load-shed provided the
load-shed priority calculated due to
OV_LOAD
z
is greater than the
load-shed priority calculated due to
LS_POWER
z
.
The module calculates the must-shedding status
MUST_SHD_STS
z
and spinning
reserve status
SP_RESV_STS
z
for adjacent electrical area as shown in
ACT_SHD_LOD
Z
–
|MUST_SHD_LOD
Z
| < 0
LS_BLOCK<z>
LS_OPR_STS
Z
“E xtended load shed” or
“F ast load shed”
SHD_PRIO_RC1
Z
= 19
t
tOff=50ms
&
&
&
POWER_BAL
Z
=> 0
MUST_SHD_STS
Z
SP_RESV_STS
Z
&
GUID-60FD150E-9423-42A5-86CE-04E43DE8C3B4 V1 EN
Figure 157:
Must-shedding status and spinning reserve status calculation
If
MUST_SHD_STS
z
is active, extended must-shedding power MUST_SHD_POW
z
is the difference of the
⃒
MUST_SHD_LOD
z
⃒
and
ACT_SHD_LOD
z
.
If
SP_RESV_STS
z
is active, the extended spinning reserve power
SP_RESV_POW
z
is same as the power balance
POWER_BAL
z
.
The module reports the
MUST_SHD_STS
z
,
SP_RESV_STS
z
,
MUST_SHD_POW
z
and
SP_RESV_POW
z
to the Peer load-shed logic module.
The reset inputs, that is,
RESET_SN1
,
RESET_SN2
,
RESET_SN3
and
RESET_SN4
, are provided to reset the load-shed data in respective subnetwork. For
example, if
RESET_SN1
or
RESET
input is active, the power balance, effective load-
shedding power, actual load-shedding, load-shedding operation and recorded
priorities are reset.
Section 7
1MRS757256 F
Power management functions
292
PML630/Compact Load-Shedding Solution
Technical Manual
Содержание Relion 630 Series
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