Settings; Monitored Data - ABB RELION 620 Series Technical Manual

Section 4
Protection functions
4.3.2.7
Table 276: 81LSH Group settings
Parameter Values (Range)
Load shed mode 1=Freq<
6=Freq< OR df/dt
8=Freq< AND df/dt
Restore mode 1=Disabled
2=Auto
3=Manual
Pickup value Freq 0.800...1.200
Pickup value df/dt -0.200...-0.005
Trip Tm Freq 80...200000
Trip Tm df/dt 120...200000
Restore pickup Val 0.800...1.200
Restore delay time 80...200000
Table 277: 81LSH Non group settings
Parameter Values (Range)
Operation 1=enable
5=disable
Reset delay time 0...60000
4.3.2.8
338
Name Type
ST_FRG BOOLEAN
RESTORE BOOLEAN
ST_REST BOOLEAN

Settings

Unit Step
xFn 0.001
xFn /s 0.005
ms 10
ms 10
xFn 0.001
ms 10
Unit Step
ms 1

Monitored data

Table 278: 81LSH Monitored data
Name Type
PICKUP_DUR FLOAT32
81LSH Enum
Description
Pick-Up signal for high df/dt detection
Restore signal for load restoring purposes
Restore frequency attained and restore timer started
Default Description
1=Freq< Set the operation mode for load shedding
function
1=Disabled Mode of operation of restore functionality
0.975 Frequency setting/pickup value
-0.010 Setting of frequency gradient for df/dt detection
200 Time delay to trip for under frequency stage
200 Time delay to trip for df/dt stage
0.998 Restore frequency setting value
300 Time delay to restore
Default Description
5=disable Operation Disable / Enable
50 Time delay after which the definite timers will
reset
Values (Range) Unit
0.00...100.00 %
1=Enabled
2=blocked
3=test
4=test/blocked
5=Disabled
1MAC504801-IB E
Description
Pickup duration
Status
620 series ANSI
Technical Manual