Characteristic Value
Reset time 40 ms
Trip time accuracy ±1.0% of the set value of ±20 ms
Suppression of harmonics -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) VG = 1.0 × Vn
2) Includes the delay of the signal output contact, results based on statistical distribution of 1000
measurements
4.2.4.11 Technical revision history
Table 387: 21YN Technical revision history
Technical revision Change
B Internal improvement.
C
Voltage pickup value
setting range and default value
change.
D Internal improvement.
E Internal improvement.
4.2.5 Harmonics-based ground-fault protection 51NHA
4.2.5.1 Identification
Description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Harmonics-based ground-fault
protection
HAEFPTOC Io>HA 51NHA
4.2.5.2 Function block
51NHA
I_REF_RES
BLOCK
PICKUP
TRIP
IG
GUID-9A831169-A6A0-4689-9715-A61794979C12 V1 EN
Figure 192: Function block
4.2.5.3 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.
1MAC059074-MB A Section 4
Protection functions
615 series ANSI 401
Technical Manual
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