ABB RELION 615 Series Product Manual page 37

Transformer Protection and Control
RET615
Product version: 5.0 FP1
Table 31. Non-directional earth-fault protection (EFxPTOC)
Characteristic
Operation accuracy
Start time 1)2)
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Operate time accuracy in inverse time mode
Suppression of harmonics
Measurement mode = default (depends on stage), current before fault = 0.0 × I
1)
statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
3) Maximum Start value = 2.5 × I ,
n
Table 32. Non-directional earth-fault protection (EFxPTOC) main settings
Parameter
Start value
Time multiplier
Operate delay time
1)
Operating curve type
1) For further reference, see the Operation characteristics table
ABB
EFLPTOC
EFHPTOC
and
EFIPTOC
EFIPTOC:
Start value
I = 2 × set
Fault
Start value
I = 10 × set
Fault
EFHPTOC and EFLPTOC:
Start value
I = 2 × set
Fault
Start value multiples in range of 1.5...20
Function
EFLPTOC
EFHPTOC
EFIPTOC
EFLPTOC and EFHPTOC
EFLPTOC and EFHPTOC
EFIPTOC
EFLPTOC
EFHPTOC
EFIPTOC
Value
Depending on the frequency of the measured current: f
±1.5% of the set value or ±0.002 × I
±1.5% of set value or ±0.002 × I
(at currents in the range of 0.1...10 × I
±5.0% of the set value
(at currents in the range of 10...40 × I
Minimum
16 ms
11 ms
23 ms
Typically 40 ms
Typically 0.96
<30 ms
±1.0% of the set value or ±20 ms
±5.0% of the theoretical value or ±20 ms
RMS: No suppression
DFT: -50 dB at f = n × f
Peak-to-Peak: No suppression
, f = 50 Hz, earth-fault current with nominal frequency injected from random phase angle, results based on
n n
Value (Range)
0.010...5.000 × I
n
0.10...40.00 × I
n
1.00...40.00 × I
n
0.05...15.00
40...200000 ms
20...200000 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
Definite or inverse time
Curve type: 1, 3, 5, 9, 10, 12, 15, 17
Definite time
1MRS756891 M
n
n
)
n
)
n
Typical Maximum
19 ms 23 ms
12 ms 14 ms
26 ms 29 ms
3)
, where n = 2, 3, 4, 5,...
n
Step
0.005
0.01
0.01
0.01
10
10
±2 Hz
n
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