ABB REM615 ANSI - Page 21

ABB 21
Motor Protection
REM615 ANSI
Product Version 2.0
1MAC251744 -PG Rev. A
Issued: 03.01.2010
Table 27. 
ree-phase non-directional overcurrent protection (50P, 51P) main settings
Parameter Function Value (Range) Step
Pickup range 51P 0.05...5.00 x I
n
0.01
50P 0.10...40.00 x I
n
0.01
Time multiplier 51P 0.8...10.0 0.05
50P 0.05...15.00 0.05
De nite time delay 51P 40...200000 ms 10
50P 40...200000 ms 10
Operating curve type
1)
51P 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
50P De nite or inverse time
Curve type: 1, 3, 5, 9, 10, 12, 15, 17
Table 28. Non-directional ground fault protection (51G)
Characteristic Value
Pickup
accuracy
Depending on the frequency of the current
measured: fn ±2Hz
51G ±1.5% of the set value or ±0.002 x I
n
50N-3, 50G-3 ±5.0% of the set value
(at currents in the range of 10…40 x I
n
)
Pickup time
1) 2)
Minimum Typical Maximum
50N-3, 50G-3:
I
Fault
= 2 x set Pickup range
I
Fault
= 10 x set Pickup range
16 ms
11 ms
19 ms
12 ms
23 ms
14 ms
51G:
I
Fault
= 2 x set Pickup range 22 ms 24 ms 25 ms
Reset time < 40 ms
Reset ratio Typical 0.96
Retardation time < 30 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 RMS: No suppression DFT: -50dB at f =
n x f
n
, where n = 2, 3, 4, 5,…
Peak-to-Peak: No suppression
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