ABB RELION REF615R, Technical Manual

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Characteristic Value
Reset ratio Typically 0.96
Retardation time <35 ms
Trip time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Trip time accuracy in inverse time mode
±5.0% of the theoretical value or ±20 ms 3)
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) Measurement mode and Pol quantity = default, current before fault = 0.0 × I
n
, voltage before fault = 1.0 ×
V
n
, f
n
= 60 Hz, fault current in one phase with nominal frequency injected from random phase angle, results
based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
3) Maximum Pickup value = 2.5 × I
n
, Pickup value multiples in range of 1.5...20
4.1.4 Non-directional neutral overcurrent protection 51N/50N and
Non-directional ground fault protection 51G/50G
4.1.4.1 Identification
Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Non-directional ground-fault protection,
low stage
EFLPTOC Io> 51N/G
Non-directional ground-fault protection,
high stage
EFHPTOC Io>> 50N/G-1/2
Non-directional ground-fault protection,
instantaneous stage
EFIPTOC Io>>> 50N/G-3
4.1.4.2 Function block
A070432-ANSI V1 EN
Figure 78: Function block
4.1.4.3 Functionality
The ground-fault function 51N/50N or 51G/50G is used as non-directional ground-fault
protection.
1MRS240050-IB C
Section 4
Protection functions
REF615R 161
Technical Manual