Technician Talk | Transformer Turns and Ratio Test

Have you ever wondered what a transformer does? Transformers are used to change voltages for different uses. For example, utilities use standard voltages to move electricity from point to point (4.16 kV, 12.47 kV, 34.5 kV, 69 kV, etc.). Often, we need a different voltage to operate tools and equipment than utilities may provide (120V, 240V, 480V, etc.). Transformers are designed to increase or decrease voltage based on a specified ratio.

So, what do you do when you install a transformer to check to make sure the ratio is correct? In today’s Technician Talk, Justin explains how we test the transformers to prove they are utilizing the correct step-up ratio.  

Each of our turbines has a transformer that steps up the power to our customer’s grid voltage – meaning it transforms turbine power at 600V to grid power at 12470V. In order to make sure our transformers run smoothly, One Energy technicians use a Digital Transformer Ratiometer (DTR) to test the turns ratio of potential power and current transformers. The turn ratio dictates the operation of the transformer and the corresponding voltage available.

Watch as Justin shows you how to use the nameplate to hook up the leads and confirm ratio accuracy. Remember the first step to testing is always to de-energize!

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