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Who to test power transformer

1 active power2 reactive power3power factor4 turn ratio5 cuber losses6 Ir ion losses

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Question added by Ezz Eldeen Morsy , technecal manager of Haql electric branch , Saudi Electric company
Date Posted: 2013/09/20
Mubarak Suliman
by Mubarak Suliman , Electrical Distribtuion Engineer , Sudanese Electricity Distribution Company

Active, reactive and power factor are not tests of transformers. For transformers there are type test and site test. These tests are standards and well known for everyone in the field.

Turn ratio test is type and site test. It is to supply the primary site of the transformer and measure the secondary site each time with change the tap changer. It can be done with a LV source and a voltemeter or by using TTR testing equipment.

Iron losses are measured by using the open circuit test.

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