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This paper presents a new method for calculating the voltage profile along a given transmission line during a system transient. This may be used for detecting harmful levels of voltage signals that appear along the length of a long transmission line during transients caused by switching events or faults. It may also be useful in obtaining screen shots of waveforms to be used in animation of traveling wave transients. The voltage profile is recovered by developing a time-series model for the voltages at intermediate points along the length of the line. The proposed method is novel in the sense that once the time-series model is developed, the technique does not require any further simulations for the calculation of the voltages at intermediate points. A transient simulator such as the Electromagnetic Transients Program is utilized to obtain the necessary historical information of the voltages at terminal ends and at the intermediate points to be used in developing the time-series model. This paper presents several examples where voltage profiles are obtained during different types of transient events. Index Terms--Time-series analysis, traveling waves, visualization of electromagnetic transients, voltage profile calculations.

This paper describes a fault location algorithm for three terminal lines using wavelet transform of the fault initiated transients. The results presented in [1] are extended to the case of three terminal configuration and a new single ended procedure is developed for teed circuits. The algorithm gives accurate results for the case of three terminal lines including series compensated branch, mutual coupled line section and different values of fault resistances. The performance of the algorithm is tested on different scenarios by using ATP/EMTP program and MATLAB Wavelet Toolbox. Index Terms--Electromagnetic transients simulations, fault location, frequency dependent line model, mutual coupled lines, series compensation, teed circuits, wavelet transform.