Multifrequency Admittance-Based Earth-Fault Protection Mfadpsde (Ansi 67Nyh) - ABB RELION REX640 Technical Manual

1MRS759142 F
4.2.8.10 Technical data
Table 611: H3EFPSEF Technical data
Characteristic
Operation accuracy
Start time
Reset time
Reset ratio
Operate time accuracy
4.2.9 Multifrequency admittance-based earth-fault protection
MFADPSDE (ANSI 67NYH)
4.2.9.1 Identification
Description
Multifrequency admittance-based
earth-fault protection
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 = 50 Hz, results based on statistical distribution of 1000 measurements
n
2
Includes the delay of the signal output contact
REX640
Technical Manual
1, 2
Value
Depending on the frequency of the meas-
ured voltage:
f ±2 Hz
n
±5% of the set value or ±0.004 × U
Typically 35 ms
Typically 35 ms
Typically 0.96 (differential mode)
Typically 1.04 (under voltage mode)
±1.0% of the set value of ±20 ms
IEC 61850 IEC 60617
identification identification
MFADPSDE Io> ->Y
Protection functions
n
ANSI/IEEE C37.2
device number
67NYH
553