scope:

This part of IEC 63042 applies to single-circuit transmission line and double-circuit 196 transmission lines on the same tower and specifies measurement methods of UHV AC transmission line power frequency parameters. UHV AC transmission line power frequency parameters are basic data for power flow calculation, relay protection settings, short-circuit current calculation, fault location, and overvoltage calculation, etc. These measured parameters mainly include sequence parameters, mutual parameters between double-circuit lines, phase parameters and some other related parameters.