ABB REM615 ANSI Product Manual page 21

Table 27. Th ree-phase non-directional overcurrent protection (50P, 51P) main settings
ABB
Motor Protection
REM615 ANSI
Product Version 2.0
Parameter
Pickup range
Time multiplier
Defi nite time delay
1)
Operating curve type
Table 28. Non-directional ground fault protection (51G)
Characteristic
Pickup
accuracy
51G
50N-3, 50G-3
1) 2)
Pickup time
50N-3, 50G-3:
I
Fault
I
Fault
51G:
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) 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
Function
51P
50P
51P
50P
51P
50P
51P
50P
= 2 x set Pickup range
= 10 x set Pickup range
= 2 x set Pickup range
1MAC251744 -PG Rev. A
Issued: 03.01.2010
Value (Range)
0.05...5.00 x I
n
0.10...40.00 x I
n
0.8...10.0
0.05...15.00
40...200000 ms
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
Defi nite or inverse time
Curve type: 1, 3, 5, 9, 10, 12, 15, 17
Value
Depending on the frequency of the current
measured: fn ±2Hz
±1.5% of the set value or ±0.002 x I
±5.0% of the set value
(at currents in the range of 10...40 x I
Minimum Typical
16 ms 19 ms
11 ms 12 ms
22 ms 24 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
0.01
0.05
0.05
10
10
n
)
n
Maximum
23 ms
14 ms
25 ms
3)
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