Table 56. 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 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
)
Start time
1)
Minimum
Typical
Maximum
EFIPTOC
2)
:
I
Fault
= 2 × set
Start value
I
Fault
= 10 × set
Start value
8 ms
8 ms
11 ms
9 ms
14 ms
11 ms
EFHPTOC and EFLPTOC
3)
:
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
4)
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, fault current in one phase with nominal frequency injected from random phase angle, results based
on statistical distribution of 1000 measurements
2)
Measured with static signal output (SSO)
3)
Includes the delay of the signal output contact (SO)
4)
Maximum
Start value = 2.5 × I
n
,
Start value multiples in the range of 1.5...20
Table 57. 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
0.025...15.000
0.005
Operate delay time
EFLPTOC and EFHPTOC
40...300000 ms
10
EFIPTOC
20...300000 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
1MRS759144 A
REX640
Product version: 1
46
ABB
Summary of Contents for RELION REX640
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