ABB Relion 620 Series - Technical Data; Fault Locator SCEFRFLO; Identification; Function Block

5.6.9 Technical data
Table 808: CVPSOF Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the voltage measured: f
n
±2Hz
Current: ±1.5 % of the set value or ±0.002 × I
n
Voltage: ±1.5 % of the set value or ±0.002 × U
n
Operate time accuracy ±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,…
5.7 Fault locator SCEFRFLO
5.7.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE
C37.2 device
number
Fault locator SCEFRFLO FLOC 21FL
5.7.2 Function block
Figure 442: Function block
5.7.3 Functionality
The fault locator function SCEFRFLO provides impedance-based fault location. It
is designed for radially operated distribution systems. It is applicable for locating
short circuits in all kinds of distribution networks. Earth faults can be located in
effectively earthed and in low-resistance or low-reactance earthed networks. Under
certain limitations, SCEFRFLO can also be applied for an earth-fault location in
unearthed distribution networks.
1MRS757644 H
Protection related functions
620 series
Technical Manual
835