ABB RER620

Section 4 1MAC309294-MB F
Protection functions
124 RER620
Technical Manual
4.1.2.11 Technical data
Table 142: 67/51P and 67/50P Technical data
4.1.3 Non-directional neutral overcurrent protection 51N/50N
4.1.3.1 Identification
Characteristic Value
Operation accuracy Depending on the frequency of the current/voltage
measured: f
n
±2Hz
67/51P and 67/50P-1 Current:
±1.5% of the set value or ±0.002 x I
n
Voltage:
±1.5% of the set value or ±0.002 x V
n
Phase angle: ±2°
67/50P-2 Current:
±1.5% of the set value or ±0.002 x I
n
(at currents in the range of 0.1…10 x I
n
)
±5.0% of the set value
(at currents in the range of 10…40 x I
n
)
Voltage:
±1.5% of the set value or ±0.002 x V
n
Phase angle: ±2°
Pickup time
12
1. Measurement mode and Pol quantity = default, current before fault = 0.0 x I
n
, voltage before fault = 1.0 x 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
Minimum Typical Maximum
I
Fault
= 2.0 x set Pickup
value
37 ms 40 ms 42 ms
Reset time < 40 ms
Reset ratio Typical 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
3. Maximum Pickup value = 2.5 x I
n
, Pickup value multiples in range of 1.5 to 20
Suppression of harmonics DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,…
Function description
IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Non-directional ground-fault protection -
Low stage
XEFLPTOC I0> 51N/G
Non-directional ground-fault protection -
High stage
XEFHPTOC I0>> 50N/G-1/2
Non-directional ground-fault protection -
Instantaneous stage
XEFIPTOC I0>>> 50N/G-3