400-KV NETWORK HARMONIC IMPEDANCE EVALUATION FROM HARMONIC DISTORTIONMEASUREMENTS AT THE RFX SITE

The lack of knowledge of the harmonic frequency behaviour of the extra -high-voltage (EHV) transmission network prevents the possibility to c hoose, at the design stage, an appropriate system for harmonic mitigat ion for current harmonic source loads directly fed by the transmission network, as well as arc furnaces and facilities for thermonuclear fus ion researches. The paper describes the methodology employed to determ ine the harmonic network impedance from current and voltage measuremen t seen at the Camin-Padova node of the Italian transmission network, i n which are injected the current harmonics produced by the reversed fi eld pinch experiment (RFX) fusion facility; in particular, a simple me thod for precise measurement of voltage harmonics is presented in deta il.