ABB RET615 - Page 37

Table 31. Non-directional earth-fault protection (EFxPTOC) main settings
Parameter Function Value (Range) Step
Start value EFLPTOC 0.010...5.000 x I
n
0.005
EFHPTOC 0.10...40.00 x I
n
0.01
EFIPTOC 1.00...40.00 x I
n
0.01
Time multiplier EFLPTOC 0.05...15.00 0.01
EFHPTOC 0.05...15.00 0.01
Operate delay time EFLPTOC 40...200000 ms 10
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 please refer to the Operating characteristics table
Table 32. Residual overvoltage protection (ROVPTOV)
Characteristic
Value
Operation accuracy Depending on the frequency of the voltage measured: f
n
±2 Hz
±1.5% of the set value or ±0.002 x U
n
Start time
1)2)
Minimum Typical Maximum
U
Fault
= 1.1 x set Start value
55 ms 56 ms 58 ms
Reset time < 40 ms
Reset ratio Typical 0.96
Retardation time < 35 ms
Operate time accuracy in definite time mode ±1.0% of the set value or ±20 ms
Suppression of harmonics DFT: -50 dB at f = n x f
n
, where n = 2, 3, 4, 5,…
1) Residual voltage before fault = 0.0 x U
n
, f
n
= 50 Hz, residual voltage 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
Table 33. Residual overvoltage protection (ROVPTOV) main settings
Parameter
Function Value (Range) Step
Start value ROVPTOV 0.010...1.000 x U
n
0.001
Operate delay time ROVPTOV 40...300000 ms 1
Transformer Protection and Control 1MRS756891 F
RET615
Product version: 4.0
ABB 37