This part of GB/T 26216 stipulates the rated value, design, structure and test of electromagnetic DC current measuring devices for DC transmission with voltage levels of ±800kV and below. This part is applicable to the electromagnetic DC current measuring device installed on the DC-level busbar of the DC transmission system with a voltage level of ±800kV and below, the midpoint (if applicable) busbar of the double-twelve pulse converter valve group and the neutral busbar.