Section 4 1MAC309294-MB F
Protection functions
216 RER620
Technical Manual
4.3.5.9 Technical data
Table 233: 47 Technical data
4.4 Frequency protection
4.4.1 Frequency protection 81O/81U, 81R
4.4.1.1 Identification
Characteristic Value
Operation accuracy Depending on the frequency of the voltage
measured: fn ±2Hz
±1.5% of the set value or ±0.002 × V
n
Pickup time
1,2
1. Negative-sequence voltage before fault = 0.0 × V
n
, f
n
= 60 Hz, negative-sequence overvoltage with nominal
frequency injected from random phase angle, results based on statistical distribution of 1000 measurements
2. Includes the delay of the signal output contact
Minimum Typical Maximum
V
Fault
= 1.1 × set
Pickup
value
V
Fault
= 2.0 × set
Pickup
value
33 ms
24 ms
35 ms
26 ms
37 ms
28 ms
Reset time < 40 ms
Reset ratio Typical 0.96
Retardation time < 35 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Frequency protection FRPFRQ f>/f<, df/dt 81O/81U, 81R
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