Abstract
Traditionally, Extra High Voltage (EHV) transmission systems consist exclusively of Overhead lines (OHL) but in the recent years the utilization of High Voltage AC (HVAC) power cables is increasing due to environmental, political and operational aspects. For transmission networks consisting of purely OHLs there are proposed guidelines concerning the modeling depth needed for acquiring accurate results when simulating transients. However, these guidelines might not be adequate when mixed OHL-Cable-OHL configurations are present in the studied network. This paper presents two methods to evaluate the required modeling depth of a transmission network consisting of both cables and OHLs when studying slow front transients and more specifically line energization. The first method evaluates the maximum overvoltage caused by the energization while the second method evaluates the harmonic content of the energization. The simulations are performed using software package PSCAD/EMTDC. It was found that the modeling depth for both objectives exceeded the advised depth proposed in the guidelines for purely OHL connections.
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