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An estimation procedure for transmission line parameters is developed that combines a new method of determining line parameters with others available in the technical literature. Each estimation method has certain advantages and restrictions that depend on the operating conditions of the transmission system (e.g. the load profile), the physical characteristics of the line (e.g. the length and the...
This research presents the electrical performance of metal-oxide surge arresters with polymeric housing, applied on the power distribution network, as a function of the physical-chemical degradation which over the time they are exposed. The surge arresters are submitted to an immersion test/aging in water with sodium chloride at 90 °C for three months, in order to simulate about 20 years of field...
The objective of this paper is to show a methodology to estimate the longitudinal parameters of transmission lines. The method is based on the modal analysis theory and developed from the currents and voltages measured at the sending and receiving ends of the line. Another proposal is to estimate the line impedance in function of the real-time load apparent power and power factor. The procedure is...
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