ABB RED615 - Negative-Sequence Overcurrent Protection (NSPTOC); Harmonics-Based Earth-Fault Protection (HAEFPTOC) Main Settings; Harmonics-Based Earth-Fault Protection (HAEFPTOC)

Table 42. Harmonics-based earth-fault protection (HAEFPTOC)
Characteristic Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
±5% of the set value or ±0.004 × I
n
Start time
1)2)
Typically 77 ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Operate time accuracy in IDMT mode
3)
±5.0% of the set value or ±20 ms
Suppression of harmonics -50 dB at f = f
n
-3 dB at f = 13 × f
n
1) Fundamental frequency current = 1.0 × I
n
. Harmonics current before fault = 0.0 × I
n
, harmonics fault current 2.0 × Start value . Results based on statistical distribution of 1000 measurement.
2) Includes the delay of the signal output contact
3) Maximum Start value = 2.5 × I
n
, Start value multiples in range of 2...20
Table 43. Harmonics-based earth-fault protection (HAEFPTOC) main settings
Parameter
Function Value (Range) Step
Start value HAEFPTOC 0.05...5.00 × I
n
0.01
Time multiplier HAEFPTOC 0.05...15.00 0.01
Operate delay time HAEFPTOC 100...200000 ms 10
Minimum operate time HAEFPTOC 100...200000 ms 10
Operating curve type HAEFPTOC Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
Table 44. Negative-sequence overcurrent protection (NSPTOC)
Characteristic
Value
Operation accuracy Depending on the frequency of the measured current: f
n
±2 Hz
±1.5% of the set value or ±0.002 × I
n
Start time
1)2)
Minimum Typical Maximum
I
Fault
= 2 × set Start value
I
Fault
= 10 × set Start value
23 ms
15 ms
26 ms
18 ms
28 ms
20ms
Reset time Typically 40 ms
Reset ratio Typically 0.96
Retardation time <35 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Operate time accuracy in inverse time mode
±5.0% of the theoretical value or ±20 ms
3)
Suppression of harmonics DFT: -50 dB at f = n × f
n
, where n = 2, 3, 4, 5,…
1) Negative sequence current before fault = 0.0, f
n
= 50 Hz, results based on statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
3) Maximum
Start value = 2.5 × I
n
, Start value multiples in range of 1.5...20
Line Differential Protection and Control
1MRS756500 K
RED615
Product version: 5.0 FP1
40 ABB