Technical Data - ABB 615 series Technical Manual

Section 4
Protection functions
4.7.2.9
4.7.3
4.7.3.1
4.7.3.2
706

Technical data

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