ABB RET620 Product Guide

Table 72. Load shedding (LSHDPFRQ)
Characteristic Value
Operation accuracy f< ±10 mHz
df/dt ±100 mHz/s (in range |df/dt| < 5 Hz/s)
± 2.0% of the set value (in range 5 Hz/s < |df/
dt| < 15 Hz/s)
Start time f< < 80 ms
df/dt < 120 ms
Reset time < 150 ms
Operate time accuracy ±1.0% of the set value or ±30 ms
Table 73. Load shedding (LSHDPFRQ) main settings
Parameter Function Value (Range) Step
Load shed mode LSHDPFRQ Freq<
Freq< AND df/dt
Freq< OR df/dt
-
Restore mode LSHDPFRQ Disabled
Auto
Manual
-
Start value Freq LSHDPFRQ 0.800...1.200 x Fn 0.001
Start value df/dt LSHDPFRQ -0.200...-0.005 x Fn 0.005
Operate Tm Freq LSHDPFRQ 80...200000 ms 10
Operate Tm df/dt LSHDPFRQ 120...200000 ms 10
Restore start Val LSHDPFRQ 0.800...1.200 x Fn 0.001
Restore delay time LSHDPFRQ 80...200000 ms 10
Transformer Protection and Control 1MRS757846 A
RET620
Product version: 2.0
44 ABB

ABB RET620 Specifications

General

Brand	ABB
Model	RET620
Category	Other
Language	English