ABB 23
Motor Protection
REM615 ANSI
Product Version 2.0
1MAC251744 -PG Rev. A
Issued: 03.01.2010
Table 31. Directional ground fault protection (67/51N) main settings
Parameter Function Value (Range) Step
Pickup range 67/51N 0.05...5.00 x I
n
0.01
Directional mode 67/51N 1=Non-directional
2=Forward
3=Reverse
Time multiplier 67/51N 0.05...15.00 0.05
De nite time delay 67/51N 60...200000 ms 10
Operating curve type
1)
67/51N De nite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
14, 15, 17, 18, 19
Operation mode 67/51N 1=Phase angle
2=I
0
Sin
3=I
0
Cos
4=Phase angle 80
5=Phase angle 88
Table 32. ree-phase overvoltage protection (59)
Characteristic Value
Pickup
accuracy
Depending on the frequency of the voltage
measured: f
n
±2Hz
±1.5% of the set value or ±0.002 x U
n
Pickup time
1) 2)
U
Fault
= 1.1 x set Pickup range Minimum Typical Maximum
22 ms 24 ms 26 ms
Reset time < 40 ms
Reset ratio Depends on the Relative hysteresis
Retardation time < 35 ms
Trip time accuracy in de nite 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: -50dB at f = n x f
n
,
where n = 2, 3, 4, 5,…
1)
Pickup range = 1.0 x U
n
, Voltage before fault 0.9 x U
n
, f
n
= 50 Hz, overvoltage in one phase-to-phase with nominal frequence 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 range = 1.20 x U
n
, Pickup range multiples in range of 1.10 to 2.00
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