ABB REM615 ANSI Product Manual page 22

Motor Protection
REM615 ANSI
Product Version 2.0
Table 29. Non-directional ground fault protection (51G) main settings
Parameter
Pickup range
Time multiplier
Defi nite time delay
Operating curve type 1)
1) For further reference please refer to the Operating characteristics table at the end of the Technical data chapter
Table 30.Directional ground fault protection (67/51N)
Characteristic
Pickup
accuracy
67/51N
Pickup time 1) 2)
67/51N:
I
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)
Set Defi nite time delay = 0,06 s, Inverse-time (IDMT) and defi nite-time (DT) curves = IEC defi nite time, Measurement mode = default
(depends on stage), current before fault = 0.0 x In, fn = 50 Hz, earth-fault current 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 range = 2.5 x In, Pickup range multiples in range of 1.5 to 20
22
Function
51G
51G
51G
51G
= 2 x set Pickup range
1MAC251744 -PG Rev. A
Issued: 03.01.2010
Value (Range)
0.05...5.00 x I
n
0.05...15.00
40...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
Value
Depending on the frequency of the current meas-
ured: f ±2Hz
n
Current:
±1.5% of the set value or ±0.002 x I
Voltage:
±1.5% of the set value or ±0.002 x U
Phase angle:
±2°
Minimum Typical
61 ms 64 ms
< 40 ms
Typical 0.96
< 30 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
RMS: No suppression DFT: -50dB at f =
n x f , where n = 2, 3, 4, 5,...
n
Peak-to-Peak: No suppression
Step
0.01
0.05
10
n
n
Maximum
66 ms
3)
ABB