The utility model belongs to pipeline cathodic protection system and friendship direct -current stray current disturb the field, relate to an electric drainager for high voltage direct current disturbs to be alleviated. Including electronic component group, box and heat abstractor, electronic component group installs on the insulation board in the box, the outside of the box that corresponds with electronic component group mounted position sets up heat abstractor. Utilize heat abstractor for electronic component organizes the heat dissipation, guarantee the normal operating of electronic component group under the high voltage and high current condition.