Harmonics-Based Earth-Fault Protection (Haefptoc); Harmonics-Based Earth-Fault Protection (Haefptoc) Main Settings; Negative-Sequence Overcurrent Protection (Nsptoc) - ABB REX640 Product Manual

REX640
Product version: 1
Table 70. Harmonics-based earth-fault protection (HAEFPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Operate time accuracy in definite time mode
Operate time accuracy in IDMT mode
Suppression of harmonics
1) Fundamental frequency current = 1.0 × I
2) Includes the delay of the signal output contact
Start value = 2.5 × I Start value multiples in range of 2...20
3) Maximum ,
n
Table 71. Harmonics-based earth-fault protection (HAEFPTOC) main settings
Parameter
Start value
Time multiplier
Operate delay time
1)
Operating curve type
Minimum operate time
1) For further reference, see the Operation characteristics table
Table 72. Negative-sequence overcurrent protection (NSPTOC)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
1) Negative sequence current before fault = 0.0, f
2) Includes the delay of the signal output contact
3) Maximum Start value = 2.5 × I , Start value multiples in range of 1.5...20
n
52
3)
, harmonics current before fault = 0.0 × I
n
Function
HAEFPTOC
HAEFPTOC
HAEFPTOC
HAEFPTOC
HAEFPTOC
Start value
I = 2 × set
Fault
I = 10 × set Start value
Fault
= 50 Hz, results based on statistical distribution of 1000 measurements
n
Value
Depending on the frequency of the measured current: f
±5% of the set value or ±0.004 × I
Typically 77 ms
Typically 40 ms
Typically 0.96
±1.0% of the set value or ±20 ms
±5.0% of the set value or ±20 ms
-50 dB at f = f
n
-3 dB at f = 13 × f
n
, harmonics fault current 2.0 × Start value , results based on statistical distribution of 1000 measurements
n
Value (Range)
0.05...5.00 × I
n
0.025...15.000
100...300000 ms
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
100...200000 ms
Value
Depending on the frequency of the measured current: f
±1.5% of the set value or ±0.002 × I
Minimum
23 ms
15 ms
Typically 40 ms
Typically 0.96
<35 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
DFT: -50 dB at f = n × f
1MRS759144 A
n
Step
0.01
0.005
10
10
n
Typical Maximum
26 ms 28 ms
18 ms 20 ms
3)
, where n = 2, 3, 4, 5,...
n
±2 Hz
n
±2 Hz
n
ABB