Patent ID: 7701225

Claim:
A dielectric strength test method of a superconducting cable, characterized in that a tested superconducting cable is filled with gas in place of a refrigerant and a regular dielectric strength test is conducted at room temperature, wherein the test method comprises the steps of: providing a first reference superconducting cable filled with a refrigerant at a predetermined pressure and a second reference superconducting cable filled with gas in place of a refrigerant at a predetermined pressure; conducting a preliminary dielectric strength test for the first reference superconducting cable at refrigerant temperature and the second reference superconducting cable at room temperature to find a correlation between dielectric strength characteristics of the cables; finding test voltage based on the dielectric strength characteristic of the second reference superconducting cable; conducting a regular dielectric strength test for the tested superconducting cable at the test voltage; and evaluating that even the tested superconducting cable filled with refrigerant satisfies the dielectric strength characteristic if the dielectric strength characteristic is satisfied in the regular dielectric strength test.