Technical Revision History; Harmonics-Based Ground-Fault Protection 51Nha; Identification; Function Block - ABB 615 series Technical Manual

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4.2.4.11
4.2.5
4.2.5.1
4.2.5.2
4.2.5.3
615 series ANSI
Technical Manual
Characteristic
Reset time
Trip time accuracy
Suppression of harmonics
1) VG = 1.0 × Vn
2) Includes the delay of the signal output contact, results based on statistical distribution of 1000
measurements

Technical revision history

Table 387: 21YN Technical revision history
Technical revision
B
C
D
E

Harmonics-based ground-fault protection 51NHA

Identification

Description
Harmonics-based ground-fault
protection

Function block

51NHA
PICKUP
IG
TRIP
I_REF_RES
BLOCK
GUID-9A831169-A6A0-4689-9715-A61794979C12 V1 EN
Figure 192: Function block

Functionality

The harmonics-based ground-fault protection function 51NHA is used instead of a
traditional ground-fault protection in networks where a fundamental frequency
component of the bround-fault current is low due to compensation.
Value
40 ms
±1.0% of the set value of ±20 ms
-50 dB at f = n × f
Change
Internal improvement.
Voltage pickup value setting range and default value
change.
Internal improvement.
Internal improvement.
IEC 61850 IEC 60617
identification identification
HAEFPTOC Io>HA
Section 4
Protection functions
, where n = 2, 3, 4, 5,...
n
ANSI/IEEE C37.2
device number
51NHA
401