Technical Data; Multifrequency Admittance-Based Earth-Fault Protection Mfadpsde; Identification; Function Block - ABB RELION REX640 Technical Manual

Section 4
Protection functions
4.2.8.10
4.2.9
4.2.9.1
4.2.9.2
4.2.9.3
522

Technical data

Table 557: H3EFPSEF Technical data
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Operate time accuracy
1) f = 50 Hz, results based on statistical distribution of 1000 measurements
n
2) Includes the delay of the signal output contact
Multifrequency admittance-based earth-fault protection
MFADPSDE

Identification

Description
Multifrequency admittance-based
earth-fault protection

Function block

GUID-1BD8F95D-1A40-49D0-BB2D-129D6B6031DC V1 EN
Figure 285: Function block

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 intermittent) or the fault
resistance value (low or high ohmic). MFADPSDE replaces traditional sensitive
Value
Depending on the frequency of the measured
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 (undervoltage mode)
±1.0% of the set value of ±20 ms
IEC 61850 IEC 60617
identification identification
MFADPSDE Io> ->Y
1MRS759142 C
n
ANSI/IEEE C37.2
device number
67NYH
REX640
Technical Manual