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4.7.2.9
Technical data
Table 612:
40 Technical data
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured
current and voltage:
f = f
n
± 2 Hz
±3.0% of the set value or ±0.2% Zb
Pickup time
1)2)
Typically 45 ms
Reset time
Typically 30 ms
Reset ratio
Typically 1.04
Retardation time
Total retardation time when the impedance returns
from the operating circle <40 ms
Trip time accuracy
±1.0% of the set value or ±20 ms
Suppression of harmonics
-50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) f
n
= 50Hz, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
4.7.3
Three-phase underimpedance protection 21G
4.7.3.1
Identification
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Three-phase underimpedance
protection
UZPDIS
Z<G
21G
4.7.3.2
Function block
TRIP
PICKUP
V_C_CA
V
1
BLOCK
21G
V_A_AB
V_B_BC
I_C
I
1
I_A
I_B
GUID-4C23B726-072B-4A11-BC6B-58D6B127480E V1 EN
Figure 350:
Function block
Section 4
1MAC059074-MB A
Protection functions
706
615 series ANSI
Technical Manual
Содержание Relion 615 series
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