The anode saturable reactor is a key device for UHVDC transmission

whose core loss directly affects the safety of converter valve. In this paper

based on the dynamic core loss model

the core loss calculation and eddy current analysis were carried out by the finite element method. A 2-D magnetic measurement device was built by composite B-H sensing technology. The magnetic characteristic parameters such as magnetization curves and specific total loss curves of the ultra-thin silicon steel sheets were measured. Based on the electromagnetic finite element simulation software

a homogenization model of the core of the anode saturable reactor was established. The power loss under actual working conditions was calculated

and the distributions of magnetic flux density

loss

and eddy current were analyzed. The results show that

in the process of switching on and off

the core loss of the anode saturable reactor under pulse current excitation distributes in the outermost layer of cores

which is much higher than the sinusoidal excitation loss. Due to the influence of the air gap on the leakage magnetic flux

the eddy currents flow along the edge of cores. The temperature rise experiment shows that the average temperature of the shell is measured up to 76 ℃. Thereby

the correctness of the core loss calculation can be verified.