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How to electrical test (PAT test) large transformers?

KC

Hello,

I need to PAT test a range of single-phase and three-phase transformers, from 15kVA up to 90kVA. These include both isolation transformers and step-down transformers.

While I have experience with general PAT testing and various PAT tester devices, I'm unsure of the best procedures when it comes to testing larger items like these.

For example, I understand that performing a leakage test using a traditional PAT tester isn’t feasible in these cases. Any guidance or best practices on how to approach testing of this kind, particularly in terms of safety checks, insulation resistance, earth continuity, and functional testing would be greatly appreciated.

Thanks in advance for your help.

Parents
  • 0

    Um, firstly are these really portable appliances and not part of the fixed electrical installation? What actually is the scope of work?

    Even if they are portable, to test it properly you'll end up with largely the same methods as fixed installs, so probably best starting your search / reading along those lines rather than trying to squeeze it into PAT. Others with more experience from the tools will no doubt be here soon to fill you in on methodology. I expect you'll need a new test device (or more than one)!

  • 0 in reply to Jam

    Hi, the TX's are indeed portable but yes, I think a fixed install approach and test equipment is required for this one.

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