IEC TR 63042-303 pdf – UHV AC transmission systems – Part 303: Guideline for the measurement of UHV AC transmission line power frequency parameters 1Scope This part of lEC 63042 specifies measurement methods of UHV AC transmission line powerfrequency parameters. These measured parameters mainly include sequence parameters,mutual parameters between double-circuit lines，phase parameters and some other relatedparameters. 2 Normative references The...