ABB Relion 630 Series, Техническое руководство

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If the
SLOWLS_OPR
output is TRUE, the
AVA_POWER
output is the same as the Ava
power SLS Trg setting, else the
AVA_POWER
output remains the same as calculated
above.
The slow load-shedding trigger is inhibited due to any of the following conditions.
• The
INHIBIT_TRG
input is TRUE.
• The
SLS_DISABLE
input is TRUE.
• The load-shedding blocking status is TRUE.
• The Slow load shed mode setting is “Disable”.
The Slow load shed logic module calculates the overload amount of the power source
as the difference of the active power (from the Power monitoring module) and the
Ava
power SLS Trg setting. For monitoring view, the
OVLOD_AMOUNT
output provides
the calculated overload amount. The
OVLOD_AMOUNT
output is zero when the active
power value is less than the Ava power SLS Trg setting or the active power value is
negative.
The Slow load shed logic module can handle the slow load-shedding
based on the overloading of the power source by the
En Ov load Amnt
shed setting set to ”Yes”. The slow load-shedding based on the
overloading of the power source can be disabled by the En Ov load
Amnt shed setting set to ”No” and the
OVLOD_AMOUNT
output set to
zero.
For monitoring view, the
SLOWLS_MODE
output provides the enabled or the disabled
status of the Slow load shed logic module.
The slow load shed mode indicates if the slow load-shedding is disabled or enabled
due to overcurrent based load shed or demand based load shed. The slow load shed
mode is provided by the
SLOWLS_MODE
output.
The
SLOWLS_MODE
output is "Disable" if any of the following condition satisfy.
• The
INHIBIT_TRG
input is TRUE.
• The
SLS_DISABLE
input is TRUE.
• The Load-shedding blocking status is TRUE.
• The Slow load shed mode setting is “Disable”.
The
SLOWLS_MODE
output is “OC & Ext Trg” if the Slow load shed mode setting is
“OC & Ext Trg”. Similarly, the
SLOWLS_MODE
output is “Max Dmd Trg” if the Slow
load shed mode setting is “Max Dmd Trg”. The
SLOWLS_MODE
output is “OC, Max
Dmd, Ext Trg” if the Slow load shed mode setting is “OC, Max Dmd, Ext Trg”.
If the
SLOWLS_MODE
is “Disable”, the output
SLOWLS_OPR
, slow load-shedding
start and slow load trigger inhibition signals are FALSE and the output
OVLOD_AMOUNT
is zero.
1MRS757256 F
Section 7
Power management functions
PML630/Compact Load-Shedding Solution 227
Technical Manual