621.319 3 partial discharges 2 621.315 1 621.319.4 1 amplitude of pulses of partial discharges 1 controlled reactor 1 distribution of electric potential 1 electric field 1 electrostatic field 1 external partial discharges 1 frontal part of the rod 1 glass-mica paper tape 1 high-voltage low-pass filter 1 location of the defect 1 long-term electric and thermal agin 1 measurement 1 partial discharge 1 partial discharge detection 1 power cable with the cross-linked insulation 1 power cables 1 regulation of the electric field 1 selective diagnostics 1 semiconductive coating 1 signal spectrum 1 stability of nonlinear properties 1 surface resistivity 1 symmetric bipolar 1 technological defects 1 test voltage 1 twisted shielded pair 1