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Since the discovery of High Tc Superconductivity in 1986, the technology of High Tc Superconducting (HTS) power cables is getting developed all over the world in a continuous manner for efficient transfer of electrical energy in power transmission. In view of the benefits that can be obtained from usage of HTS cables in future power transmission systems, Applied Superconductivity Laboratory, IIT Kharagpur, in collaboration with Central Power Research Institute (CPRI), Bangalore has developed a 1m. long lab-scale superconducting cable carrying 1 kA current at low voltages (~10 volts). Further, for testing the HTS cable under cryogenic conditions, a flexible co-axial cryostat made out of double walled SS bellows with multi-layer insulation, vacuum in the space between the walls and suitable end-connectors is fabricated. The Superconducting cable assembly containing HTS layer (2G YBCO HTS tapes wound helically around a copper former), PPLP dielectric and insulating layers cooled by liquid nitrogen is tested for superconductivity in the double walled flexible cryostat using an AC power supply (0-1500 Amps AC) and necessary measuring instruments (nano voltmeter, temperature controller). In the present paper, the Voltage – Current characteristic of the HTS cable along with its detailed development procedure is presented.