ABB RELION REX640 - 4.2.9.10 Technical data; 4.2.10 Touch voltage based earth-fault current protection IFPTOC (ANSI 46 SNQ;59 N); 4.2.10.1 Identification; 4.2.10.2 Function block

4.2.9.10 Technical data
Table 624: MFADPSDE Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the measured
voltage:
f
n
±2 Hz
±1.5% of the set value or ±0.002 × U
n
Start time
1
Typically 35 ms
Reset time Typically 40 ms
Operate time accuracy ±1.0% of the set value or ±20 ms
4.2.10 Touch voltage based earth-fault current protection IFPTOC
(ANSI 46SNQ/59N)
4.2.10.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Touch voltage based earth-fault
current protection
IFPTOC IFPTOC 46SNQ/59N
4.2.10.2 Function block
Figure 334: Function block
4.2.10.3 Functionality
The touch voltage-based earth-fault current protection function IFPTOC provides
selective earth-fault protection for single-phase earth faults in high-impedance
earthed networks, that is, in compensated, unearthed and high resistance earthed
1
Includes the delay of the signal output contact, results based on statistical distribution of 1000
measurements.
Protection functions 1MRS759142 F
582 REX640
Technical Manual