ABB RELION REX640 - 4.2.8.10 Technical data; 4.2.9 Multifrequency admittance-based earth-fault protection MFADPSDE (ANSI 67 NYH); 4.2.9.1 Identification; 4.2.9.2 Function block

4.2.8.10 Technical data
Table 611: H3EFPSEF Technical data
Characteristic Value
Operation accuracy Depending on the frequency of the meas-
ured voltage:
f
n
±2 Hz
±5% of the set value or ±0.004 × U
n
Start time
1, 2
Typically 35 ms
Reset time Typically 35 ms
Reset ratio
Typically 0.96 (differential mode)
Typically 1.04 (under voltage mode)
Operate time accuracy ±1.0% of the set value of ±20 ms
4.2.9 Multifrequency admittance-based earth-fault protection
MFADPSDE (ANSI 67NYH)
4.2.9.1 Identification
Description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Multifrequency admittance-based
earth-fault protection
MFADPSDE Io> ->Y 67NYH
4.2.9.2 Function block
Figure 318: Function block
4.2.9.3 Functionality
The multifrequency admittance-based earth-fault protection function MFADPSDE
provides selective directional earth-fault protection for high-impedance earthed
networks, that is, for compensated, unearthed and high-resistance earthed
systems. It can be applied for the earth-fault protection of overhead lines and
underground cables, regardless of the earth-fault type (continuous, transient or
1
f
n
= 50 Hz, results based on statistical distribution of 1000 measurements
2
Includes the delay of the signal output contact
1MRS759142 F Protection functions
REX640
Technical Manual
553