ABB 615 Series - Technical Data

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