The invention discloses an on-site
measurement device and a measurement method for
surface charges of a high-
voltage direct-current
bushing. The on-site
measurement device comprises: a lifting platform and a stepping unit, wherein the lifting platform and the stepping unit are used for carrying out radial and axial two-dimensional stepping scanning on the high-
voltage direct-current
bushing; an
epoxy frame which is installed on the lifting platform and the stepping unit and moves along with the lifting platform and the stepping unit, wherein the high-
voltage direct-current sleeve penetrates through the center of the
epoxy frame; and a plurality of induction electrodes and a
signal acquisition module in the electrostatic probe scanning unit which are mounted in holes reserved in the
epoxy frame. Radial and axial two-dimensional stepping scanning is carried out on the high-voltage direct-current
bushing through the lifting platform and the stepping unit, the sensing
electrode generates sine-rule displacement relative to the surface of the high-voltage direct-current bushing, the
signal acquisition device is used for sensing sine-rule changing current,
signal conversion is carried out on the current, then
processing is carried out, and the
surface charge density distribution of the high-voltage direct-current bushing is calculated. The device is suitable for field test, and can rapidly, safely and accurately measure the
surface charge distribution condition of the high-voltage direct-current bushing.