Transformer short circuit test

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At my workplace we carryout short circuit tests and we normally inject on the HV side a voltage which gives us the rated primary current. We get the rated full load currents at the seconday side, although the input voltage for this test is just a small percentage of the rated primary voltage. I need to be assisted on one thing; What should be the minimum and maximum acceptable neutral current for this kind of test. John Chirwa - Transformer Workshop Foreman Zambia Electricity Supply Corporation (ZESCO) EMAIL johnchirwa@zesco.co.zm