is
basically not possible compensate completely with the classic P-coil.2.
The current across the faulty section will its smallest value, when the capacitive cur-
rent the healthy lines equal the current through the P-coil. However, residual cur-
rent will still flow across the faulty section, even the presence full compensation. Both currents have
opposite signs and cancel each other, the faulty section position.Page 25
Applications
6.
Definitions
Ipos/Icomp Current coil position without/with other connected coils the grid
v Current detuning [A] [%]
Une Momentary value the zero sequence voltage. Can displayed [%],[V] [kV]
Iw Expected residual current across the faulty section when low impedance earth
fault occurs
Ires Equivalent value the grid capacitance corresponding the coil position the
resonance point
IMin Minimum value which the coil can set
IMax Maximum value which the coil can set
Based these determined values, the expected current the faulty section can already
be determined when the grid healthy state.3 Grid parameters calculated the regulator
During tuning, the regulator records all the values needed calculate the resonance
curve and displays the results the embedded screen.
