What are the functions of the semiconductor layer of X-ray high voltage cables?

The role of the semiconductor layer of the X-ray high-voltage cable is to eliminate the electrostatic field between the outer surface of the insulating layer and the metal shielding layer. The semiconductor layer of the X-ray high voltage cable is tightly wrapped on the insulating layer with gray-black semiconductor rubber.

When the metal shielding layer and the insulating layer are in poor contact somewhere, the positive charge at the poor contact will form a high-voltage electrostatic field with the metal shielding layer, ionizing the gas between the two and destroying its insulation performance. Therefore, a semiconductor layer is added between the two layers of the X-ray high voltage cable. Since electrons move in the semiconductor layer of the X-ray high-voltage cable, it is impossible to form a high-voltage electrostatic field at the poor contact.

It can be known from physics that when the insulator of an X-ray high-voltage cable is subjected to an external electric field, its molecules will be polarized to form an electric dipole, and arranged along the direction of the external electric field, so that the equal and negative charges are made. These charges are firmly bound by the nucleus and cannot leave the dielectric, which are called bound charges. Since the core wire of the X-ray high-voltage cable works under DC high voltage, a high-voltage electrostatic field is formed, the insulating layer is polarized, and negatively charged wires will appear on the inner surface layer close to the core wire, and positive charges will appear on the outer surface layer . The sharing of the semiconductor layer of X-ray high-voltage cables comes here first.

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Author: 肖恩