Table 37. Non-directional earth-fault protection (EFxPTOC) main settings
Parameter Function Value (Range) Step
Start value EFLPTOC 0.010...5.000 pu 0.005
EFHPTOC 0.10...40.00 pu 0.01
EFIPTOC 0.10...40.00 pu 0.01
Time multiplier EFLPTOC 0.05...15.00 0.01
EFHPTOC 0.05...15.00 0.01
Operate delay time EFLPTOC 0.04...200.00 s 0.01
EFHPTOC 0.02...200.00 s 0.01
EFIPTOC 0.02...200.00 s 0.01
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
Table 38. Directional earth-fault protection (DEFxPDEF)
Characteristic
Value
Operation accuracy At the frequency f = f
n
DEFLPDEF
Current:
±1.5% of the set value or ±0.002 × I
n
Voltage
±1.5% of the set value or ±0.002 × U
n
Phase angle: ±2°
DEFHPDEF Current:
±1.5% of the 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
)
Voltage:
±1.5% of the set value or ±0.002 × U
n
Phase angle: ±2°
Start time
1)2)
DEFHPDEF and DEFLPTDEF:
I
Fault
= 2 × set
Start value
Typically 54 ms (±15 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) Set
Operate delay time
= 0.06 s,
Operate curve type
= IEC definite time,
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 to 20
Generator Protection and Control
1MRS757583 C
Product version: 1.3
30 ABB
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