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Analysis of electromagnetic transients in reactive compensators type MSCDN - Mechanically Switched Capacitor with Damping Network

The MSCDN - Mechanically Switched Capacitor with Damping Network has gained space in today's electric energy transmission systems, with large facilities already in operation in many countries. It is designed to undergo daily energizing and de-energizing switching, thus being exposed to intense and frequent transient stresses, requiring special care in the specification and design of its components. This paper presents some discussions on transients that impact on the specification and design of the MSCDN components, particularly the filter reactor. A system composed of some 500 km of 230 kV transmission lines, a 500/230 kV substation with a 150 MVAr MSCDN, tuned to the third harmonic, was modeled on the ATP (Alternative Transients Program) environment, allowing the simulation of transients involving the MSCDN energization, a 500/230 kV transformers energization, and short circuit at 1 km from substation.