It depends on your testing plans in the future. If you want to do it right do a Tan Delta test to establish baseline data and do TD testing at regular intervals.
2nd option, VLF test, energize, then do on line PD testing to establish baselibe data for future on line PD testing. If getting a shutdown is near impossible at your facility this may be your best option.
3rd option, VLF test. If you do not plan on doing any regular testing in the future a VLF test will suffice. Not the best option but the cheapest.
quality-DC hipot not an effective test fir acceptance testing, and bnit allowed by any standard after 5 years. Power frequency AC hipot requires a huge power supply for MV cables and is unrealistic.
The baseline data is for condition assesment. There have been some excellent threads here in the past.
Were the reels shipped to you with knowledge they would be tested (in some fashion) on the reel? Check to see if the inside cable end is accessible. If so, is it undamaged and long enough to be prepped for testing? If not, your options may be limited for testing on the reel. Regarding type of test I would consult the manufacturer. You don't want to jeopardize any warranties.
