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How to Test a Potential TransformerBy Carlos Mano, eHow Contributor

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High-voltage electricity must bestepped down before taking measurements.

Potential transformers are special transformers designed to step down the high voltages

in utility lines to a level that can be measured. Voltmeters can measure voltages in therange of hundreds of volts. Power lines carry voltages in the range of hundreds ofthousands of volts. Instead of building meters to measure hundreds of thousands of volts,it is easier to build a transformer that steps down the voltage in the ratio of a thousand toone. Because of the high voltages involved, it is prudent to check potential transformerscarefully before using them.

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Things You'll Need

Multimeter

AC power source

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Instructions1.

o 1Test for "opens," which are breaks in the wire coils. Use the ohmmeter setting on a

multimeter with the control knob at the lowest setting. The transformer will have two wireson the primary side and two wires on the secondary side; both sides need to be checked for abreak in the coil. Place one ohmmeter probe firmly against each of the two wires of theprimary side. The needle should register a value larger than zero and less than a thousandohms. If there is an open, the reading will be much larger than a thousand. Do the samecheck for the secondary side.

o 2Check for shorts in the transformer coils. Place one probe of the ohmmeter on one of theprimary wires and the other probe on one of the secondary wires -- if it does not look like anopen, there is a short. To check for shorts to the frame, put one probe on the frame andtouch the other probe to all the wires in turn. They should all look like opens.

o

o 3Connect the primary side to a known AC power source. Set your multimeter to AC volts andmeasure across the secondary coil. The ratio between what you know is going into theprimary side and what you measure coming out the secondary coil should be in the ratiothat the potential transformer is rated at. For example, if the potential transformer issupposed to step the voltage down in the ratio of a thousand to one and you are connectingthe primary coil to a 240-volt power supply, the voltmeter reading should be 240/1000 =

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Resistance tester.

Automatic - 10 / 20 / 40 Amps

www.udeyraj.com

Tips & Warnings

You must "zero adjust" the ohmmeter before using it. Hold the ohmmeter probes firmly together with yourleft hand and turn the tiny zero adjust knob with your right hand until the needle registers zero. This must be

done every time you take a measurement.

To protect your multimeter, it is recommended that you start any voltage measurement with the control knobset to the largest voltage. If the needle does not move at this setting, go to the next lower setting. Keep doing

this until the needle moves to a place where it is readable.

Read more:How to Test a Potential Transformer | eHow.comhttp://www.ehow.com/how_7868073_test-potential-

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