BS IEC 63075:2019 pdf free.Superconducting AC power cables and their accessories for rated voltages from 6 kV to 500 kV – Test methods and requirements.
The test shall be performed on cable core samples with a minimum active length of 1 m usingalternating voltage at power frequency.The test cable core shall be immersed in the cryogenin accordance with Clause 6.The maximum temperature of the cryogen shall be greater thanor equal to the maximum operating temperature and its minimum pressure shall be less thanor equal to the minimum operating pressure.
One sample from each shipping reel shall be taken and subjected to the voltage test. If thelength of the cable core on the shipping reels exceeds 1 000 m, one sample from each end ofthe reel shall be tested.Each dielectric in the cable shall be subjected to the electric tests.
9.2.2Procedure
The test voltage shall be raised gradually to the specified value,which shall then be held for30 min between the conductors adjacent to the dielectric in accordance with Table 1.
The voltage shall be gradually increased for the voltage test and then decreased aftercompletion of the voltage test to the partial discharge measurement voltage in accordancewith Table 1.
The partial discharge test shall be carried out in accordance with lEC 60885-3 for cables witha sensitivity of 5 pC or better.
9.2.3Requirement
No breakdown of the insulation at test voltage shall occur and no detectable partial dischargeshall occur.
lf the sample from any length selected for the tests fails,an investigation of the cause forfailure shall be undertaken. If agreed between the customer and manufacturer to proceed withroutine testing， two further samples shall be taken from either side of the same reel and thetest shall be repeated. lf both additional samples pass the tests, the reel from which theywere taken shall be regarded as having complied with the requirements of this document. ifeither fails, this reel shall be regarded as having failed to comply.
9.3Critical current measurement
9.3.1General
The critical current of each cable conductor containing HTS material shall be measured andrecorded.The critical current measurement shall be performed on a cable core sample with aminimum length of 1 m between the voltage taps excluding the contacts.The test cable coreshall be immersed in the cryogen in accordance with Clause 6.
One sample from each shipping reel shall be taken and subjected to the test. lf the length ofthe cable core on the shipping reels exceeds 1 000 m, one sample from each end of the reelshall be tested.
The cryogen temperature (Tm) shall be recorded. In the case of cryogen circulation，thetemperature (T ) at the measurement is defined as the average between the inlet and outlettemperatures.BS IEC 63075 pdf download.