Table 33. Non-directional earth-fault protection (EFxPTOC)
Characteristic
Value
Operation accuracy
Depending on the frequency of the measured current: f
n
±2 Hz
EFLPTOC
±1.5% of the set value or ±0.002 × I
n
EFHPTOC
and
EFIPTOC
±1.5% of set value or ±0.002 × I
n
(at currents in the range of 0.1…10 × I
n
)
±5.0% of the set value
(at currents in the range of 10…40 × I
n
)
Start time
1)2)
Minimum
Typical
Maximum
EFIPTOC:
I
Fault
= 2 × set
Start value
I
Fault
= 10 × set
Start value
16 ms
11 ms
19 ms
12 ms
23 ms
14 ms
EFHPTOC and EFLPTOC:
I
Fault
= 2 × set
Start value
23 ms
26 ms
29 ms
Reset time
Typically 40 ms
Reset ratio
Typically 0.96
Retardation time
<30 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
RMS: No suppression
DFT: -50 dB at f = n × 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 × I
n
, f
n
= 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
Start value = 2.5 × I
n
,
Start value multiples in range of 1.5...20
Table 34. Non-directional earth-fault protection (EFxPTOC) main settings
Parameter
Function
Value (Range)
Step
Start value
EFLPTOC
0.010...5.000 × I
n
0.005
EFHPTOC
0.10...40.00 × I
n
0.01
EFIPTOC
1.00...40.00 × I
n
0.01
Time multiplier
EFLPTOC and EFHPTOC
0.05...15.00
0.01
Operate delay time
EFLPTOC and EFHPTOC
40...200000 ms
10
EFIPTOC
20...200000 ms
10
Operating curve type
1)
EFLPTOC
Definite or inverse time
Curve type: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19
EFHPTOC
Definite or inverse time
Curve type: 1, 3, 5, 9, 10, 12, 15, 17
EFIPTOC
Definite time
1)
For further reference, see the Operation characteristics table
Generator and Interconnection Protection
1MRS758279 B
REG615
Product version: 5.0 FP1
ABB
35