Electrical tree test device for silicone rubber material for cable accessory and method for preparing sample

An electrical tree test device for a silicone rubber material for a cable accessory, the electrical tree test device comprising an insulation oil bath tank, a power wire, a digital microscopic imaging system, and a tensile test device configured to stretch an electrical tree test sample,

• wherein the digital microscopic imaging system comprises:
• a microscope lens disposed above the tensile test device;
• a cold light source disposed below the insulation oil bath tank;
• and
• a computer connected to the microscope lens,
• wherein the power wire comprises:
• a high-voltage power wire, one end of the high-voltage power wire being connected to a high-voltage power supply, and another end of the high-voltage power wire being connected to a high-voltage electrode of the electrical tree test sample;
• and
• a grounding wire, one end of the grounding wire being grounded, and another end of the grounding wire being connected to a ground electrode of the electrical tree test sample, and
• wherein the tensile test device is disposed in the insulation oil bath tank, and comprises two tensile members that are symmetrically arranged, each of the tensile members comprising:
• a movable screw rod;
• an adjusting nut;
• a vertical plate arranged vertically;
• and
• a slider located between the vertical plates of the two tensile members, one end of the movable screw rod penetrating the slider, and another end of the movable screw rod penetrating the vertical plate, wherein the adjusting nut is disposed on the other end of the movable screw rod penetrating the vertical plate, and the vertical plates of the two tensile members are connected to each other by a support rod.