Table 35. Directional earth-fault protection (DEFxPDEF) main settings
Parameter Function Value (Range) Step
Start Value DEFLPDEF 0.010...5.000 pu 0.005
DEFHPDEF 0.10...40.00 pu 0.01
Directional mode DEFLPDEF and
DEFHPDEF
1=Non-directional
2=Forward
3=Reverse
Time multiplier DEFLPDEF 0.05...15.00 0.05
DEFHPDEF 0.05...15.00 0.05
Operate delay time DEFLPDEF 0.06...200.00 s 0.01
DEFHPDEF 0.06...200.00 s 0.01
Operating curve
type
1)
DEFLPDEF Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12,
13, 14, 15, 17, 18, 19
DEFHPDEF Definite or inverse time
Curve type: 1, 3, 5, 15, 17
Operation mode DEFLPDEF and
DEFHPDEF
1=Phase angle
2=IoSin
3=IoCos
4=Phase angle 80
5=Phase angle 88
1) For further reference, refer to the Operating characteristics table
Table 36. Rotor earth-fault protection (MREFPTOC)
Characteristic
Value
Operation accuracy Depending on the frequency of the current
measured f=fn ± 2 Hz
±1.5% of the set value or ±0.002 x In
Start time
1)2)
Typical 25 ms (+-15ms)
Reset time < 50 ms
Reset ratio Typical 0.96
Retardation time < 50 ms
Operate time accuracy ±1.0% of the set value of ±20 ms
Suppression of harmonics -50dB at f = n x fn, where n = 2, 3, 4, 5,…
1) 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.
Motor Protection and Control 1MRS756977 D
REM630
Product version: 1.1 Issued: 2011-05-18
ABB 33
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