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The cooling classification of a transformer, expressed in letters, designate the type cooling system used.
Heat is one of the leading causes of transformer failure. The main source of heat generation in transformers are caused by copper loss in the windings and core (I²R losses).
If heat inside of a transformer is not properly dissipated, the temperature of the transformer will rise continually, which may damage the insulation.
Hand Operated Transformer Turns Ratio Tester. Photo: MEGGER
There may be instances where mechanical wear or electrical failures can cause a turns ratio test set to be inaccurate or inoperative.
You can verify the performance of your hand-crank TTR by quickly running through the following checks:
1kV Megohmmeter commonly used in the field to test electrical insulation. Photo: Megger
There are three different tests that can be performed with the Megohmmeter. A strong understanding of these common test methods is an important tool in gaining the ability to determine the condition and quality of electrical insulation.
