Calculation of Zero Sequence Inductance of a Three-Phase Reactor

Zero sequence impedance is an essential parameter for the analysis of unbalanced faults and protection in the electrical power system. An inductance per phase is used between grid and AC/DC voltage source converter in order to control the real and reactive power flow. The zero sequence value of this inductance is also effective in the current path created by the common mode voltage of the converter. This inductance limits common mode current injected to the network. The currents in passive harmonic filters and shunt reactors are also analyzed by using zero sequence value of their inductance during unbalanced loading. In this paper, the magnetostatic and transient analyses have been carried out on three-legged core by using ANSYS package program to estimate the zero sequence value of the inductance.