Based on the fundamental principle of the transmission line parameter measurement method and the engineering applications

the comprehensive analysis and research on the current measurement methods are carried out. The transmission line model is analyzed based on the electromagnetic coupling characteristics of transmission lines. On this basis

the transmission line parameter measurement methods are classified according to the basic methods of measurement

anti interference and parameter calculation

explaining the basic principles and characteristics of different methods. There are some difficulties in parameter measurement of multi circuit transmission line

such as zero sequence signal generation

T-connection or non-full parallel line parameter measurement

wide area measurement system parameters used for on-line measurement

application of non-contact measurement method

and influence and countermeasure of shunt reactor

impedance wave coupler and coupling capacitor of transmission line on parameter measurement. Corresponding solutions are proposed to solve these problems.