ABB RET615 Product Manual page 37

ABB
Transformer Protection and Control
RET615
Product version: 4.0
Table 31. Non-directional earth-fault protection (EFxPTOC) main settings
Parameter
Start value
Time multiplier
Operate delay time
1)
Operating curve type
1) For further reference please refer to the Operating characteristics table
Table 32. Residual overvoltage protection (ROVPTOV)
Characteristic
Operation accuracy
1)2)
Start time
Reset time
Reset ratio
Retardation time
Operate time accuracy in definite time mode
Suppression of harmonics
1) Residual voltage before fault = 0.0 x U
statistical distribution of 1000 measurements
2) Includes the delay of the signal output contact
Table 33. Residual overvoltage protection (ROVPTOV) main settings
Parameter
Start value
Operate delay time
Function
EFLPTOC
EFHPTOC
EFIPTOC
EFLPTOC
EFHPTOC
EFLPTOC
EFHPTOC
EFIPTOC
EFLPTOC
EFHPTOC
EFIPTOC
Start value
U = 1.1 x set
Fault
, f = 50 Hz, residual voltage with nominal frequency injected from random phase angle, results based on
n n
Function
ROVPTOV
ROVPTOV
Value (Range)
0.010...5.000 x I
n
0.10...40.00 x I
n
1.00...40.00 x I
n
0.05...15.00
0.05...15.00
40...200000 ms
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
Value
Depending on the frequency of the voltage measured: f
±2 Hz
±1.5% of the set value or ±0.002 x U
Minimum Typical
55 ms 56 ms
< 40 ms
Typical 0.96
< 35 ms
±1.0% of the set value or ±20 ms
DFT: -50 dB at f = n x f , where n = 2, 3, 4, 5,...
n
Value (Range)
0.010...1.000 x U
n
40...300000 ms
1MRS756891 F
Step
0.005
0.01
0.01
0.01
0.01
10
10
10
n
n
Maximum
58 ms
Step
0.001
1
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