A new numerical method for computing electromagnetic transients of HV transmission line faults and circuit breaker operations

A new method for accurately computing the electromagnetic transients on long transmission lines caused by short/ open circuit faults or on/off switching operations of circuit breakers is proposed in this paper. It is based on multi-conductor transmission line theory, frequency-domain analysis approach, numerical Laplace inverse transformation and convolution, and especially the effect of fault electric arcs is considered herein such that the simulation is more realistic. The computation is performed in ABC reference frames. It has the following advantages: (1) the frequent-dependency of line parameters and the influence of fault electric arcs can be taken into account; (2) transposed or untransposed, single-or double-circuit lines and the non-diagonalizable line constant matrices Z and Y can be analyzed; (3) phase-angle of voltage (for short-circuit) or current (for open-circuit) at the instant when fault happens and the phase-angle of current at the instant when circuit breaker switches can be arbitrarily designated.