The calculation of conductor ampacity is an important part of the design of DC converter station. At present

there is no code for calculating the conductor ampacity of DC converter station. In view of the complexity of current stress on the conductor of DC converter station

the basic principle of conductor ampacity calculation under different current-carrying conditions in converter stations is given according to the basic principles of current-carrying capacitycalculation

and the modified heat balance equation suitable for the conductor ampacity calculation in converter station is determined. In terms of current-carrying capacity calculation method

the calculation methods and their results of current-carrying capacity of AC conductor given by five codes and specifications

including electrical primary design manual

DL /T 5222-2005

IEEE 738-2012

IEEE 605-2008 and IEC 61597-1995

are comprehensively analyzed and compared

and different calculation methods of convective heat dissipation power are emphatically compared. It is suggested to use the modified calculation method of primary electrical manual to calculate the outdoor conductor ampacity in converter stations

and according to the different outer diameter of conductors

the recommended method by IEEE 738 and the actual method by DL/T 5222 can be used to calculate indoor conductor ampacity of converter station.