ABB REM615 ANSI Product Manual page 23

ABB
Motor Protection
REM615 ANSI
Product Version 2.0
Table 31. Directional ground fault protection (67/51N) main settings
Parameter
Pickup range
Directional mode
Time multiplier
Defi nite time delay
Operating curve type 1)
Operation mode
Table 32. Th ree-phase overvoltage protection (59)
Characteristic
Pickup
accuracy
1) 2)
Pickup time U
Fault
Reset time
Reset ratio
Retardation time
Trip time accuracy in defi nite time mode
Trip time accuracy in inverse time mode
Suppression of harmonics
1) Pickup range = 1.0 x U , Voltage before fault 0.9 x U
n
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
Function
67/51N
67/51N
67/51N
67/51N
67/51N
67/51N
= 1.1 x set Pickup range
, f = 50 Hz, overvoltage in one phase-to-phase with nominal frequence injected from
n n
, Pickup range multiples in range of 1.10 to 2.00
n
1MAC251744 -PG Rev. A
Issued: 03.01.2010
Value (Range)
0.05...5.00 x I
n
1=Non-directional
2=Forward
3=Reverse
0.05...15.00
60...200000 ms
Defi nite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
14, 15, 17, 18, 19
1=Phase angle
2=I Sin
0
3=I Cos
0
4=Phase angle 80
5=Phase angle 88
Value
Depending on the frequency of the voltage
measured: f ±2Hz
n
±1.5% of the set value or ±0.002 x U
Minimum Typical
22 ms 24 ms
< 40 ms
Depends on the Relative hysteresis
< 35 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
DFT: -50dB at f = n x f ,
n
where n = 2, 3, 4, 5,...
Step
0.01
0.05
10
n
Maximum
26 ms
3)
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