Table 1.
XLPE cable specification used to test.
Fig 1.
Profile of protrusion defect in the cable.
Fig 2.
Wiring diagram of the cable in schematics.
Fig 3.
Wiring diagram of the cable in Physical drawing.
Fig 4.
The test circuit of DC cable partial discharge.
Fig 5.
Schematic diagram of discharge simulation.
Fig 6.
Schematic diagram of discharge grid division.
Fig 7.
Experimental workflow diagram.
Fig 8.
The discharge pattern of the whole experiment process of the protrusion defect.
Fig 9.
The average discharge of the whole experiment process of the protrusion defect.
Fig 10.
Discharge frequency of the whole experiment process of the protrusion defect.
Fig 11.
The cumulative discharge quantity of the whole experiment process of the protrusion defect.
Fig 12.
The growth rate of the whole experiment process of the protrusion defect.
Fig 13.
The cumulative discharge quantity and its growth rate of the whole experiment process of the protrusion defect-50
μm.
Fig 14.
The cumulative discharge quantity and its growth rate of the whole experiment process of the protrusion defect-10
μm.
Fig 15.
Radial electric field intensity of protrusion defect with a curvature radius of 50
μm.
Fig 16.
Radial electric field intensity of protrusion defect with a curvature radius of 10
μm.
Fig 17.
Electron migration diagram of the protrusion defect’s partial discharge.
Fig 18.
Discharge currents for 0.5 mm and 1 mm discharge paths.
Fig 19.
Equivalent circuit for partial discharge of cable defects.
Fig 20.
Average discharge of the protrusion defect at different stages.
Fig 21.
Average frequency of the protrusion defect at different stages.