A Simple and Precise Method to Assess the Switching Overvoltages in EHV Insulated Cables

The Laplace domain is a well-known tool in order to study circuit transients. When dealing with power transmission lines with uniformly distributed parameters the usual transmission matrix or ABCD matrix can be also written in Laplace domain. This involves voltage and current dependence upon space and time independent variables. In case of an insulated cable line (ICL) energization, the voltage at no-load end represents one of the most important switching overvoltages. Therefore the possibility of having a reliable, simple, fast and self-implemented tool to determine the transient behaviour can be extremely important for power electric engineers both for validation of commercial software (e.g. Electromagnetic Transient Program - Reconstructed Version, with acronym EMTP-RV) and for understanding the different roles played by each parameter in the transient