Abstract
The author has already presented some papers which allow studying cable systems by means of the multiconductor cell analysis (MCA). This method considers the cable system in its real asymmetry without simplified and approximated hypotheses. The multiconductor matrix procedure based on the use of admittance matrices, which account for the line cells (with earth return currents), different types of screen bonding, possible multiple circuits (single and double circuit or more), allows predicting the steady-state regime of any cable system. In the previous papers, these matrix algorithms have been presented with reference to a short extra-high voltage (EHV) double-circuit cross-bonded (CB) underground cable (UGC) system. Since the cable link was short, the shunt reactive compensation was not necessary and consequently not considered. In this paper the procedure is generalized in order to take into account three single-phase (or also one three-phase) reactors installed at the cable ends or also at intermediate locations.
Highlights
Insulated cables constitute complex cases of multiconductor systems, which cannot be studied in detail by means of a simplified single-phase equivalent circuit
The power of the self-made multiconductor cell analysis (MCA) is the applicability to very different systems, e.g., HVDC
The MCA has been applied to a single-core CB underground cable (UGC) with shunt compensation
Summary
Insulated cables constitute complex cases of multiconductor systems, which cannot be studied in detail by means of a simplified single-phase equivalent circuit. The multiconductor theory is used in several situations, e.g., analysis of electromagnetic interferences between systems of different kind. The modelling used for the abovementioned electromagnetic compatibility studies cannot be applied to multiconductor analysis inside a unique. It is easy to understand how, by considering the physical reality of the power networks, it can be questionable to assume purely three-phase configurations and perfectly symmetrical ones, so to use the three sequence modelling. Multiconductor analysis becomes necessary, since it allows one to achieve great precision results, offering a powerful tool in order to validate approximated and simplified computation methods. The whole exposition of the MCA can be found in [1,2] or, with a more didactical approach, in a book [3]
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