Monitored Data; Technical Data; Frequency Protection; Frequency Protection 81 - ABB RELION 620 Series Technical Manual

Section 4
Protection functions
4.2.7.8
4.2.7.9
4.3
4.3.1
4.3.1.1
318

Monitored data

Table 261: 27R Monitored data
Name Type
PICKUP_DUR FLOAT32
REM_V_A FLOAT32
REM_V_B FLOAT32
REM_V_C FLOAT32
27R Enum

Technical data

Table 262: 27R Technical data
Characteristic
Operation accuracy
1)
Pickup time
Reset time
Reset ratio
Retardation time
2)
Operate time accuracy
Suppression of harmonics
1) Includes the delay of the signal output contact
2) Operate time delays do not account for variation due to pickup delay

Frequency protection

Frequency protection 81

Identification

Function description
Frequency protection
Values (Range) Unit
0.00...100.00 %
0.00...4.00 xUn
0.00...4.00 xUn
0.00...4.00 xUn
1=Enabled
2=blocked
3=test
4=test/blocked
5=Disabled
Value
±4% of setting or ±0.01 × V
±10% of setting (20 Hz > = f ≥ 10 Hz)
Minimum
30 ms
<180 ms
Depends on the relative hysteresis setting
<45 ms
±1.0% of the set value or ±20 ms
Operates only in RMS mode
IEC 61850 IEC 60617
identification identification
FRPFRQ f>/f<,df/dt
1MAC504801-IB E
Description
Ratio of pickup time / trip time
Remanent voltage on phase A
Remanent voltage on phase B
Remanent voltage on phase C
Status
(70 Hz > = f > 20 Hz)
n
Typical Maximum
75 ms 140 ms
ANSI/IEEE C37.2
device number
81
620 series ANSI
Technical Manual