Resistência de Isolamento em Motores Elétricos

Insulation Resistance in Electric Motors

One of the indispensable tests to be done before energizing an electric motor is called an insulation resistance test on electric motors.

When it comes to electricity, every care is more than necessary. It is indispensable.

By reading this article you will understand what the insulation resistance test in electric motors is and why it is so important. Read on!

How insulation tests are done on electric motors

Testing insulation resistance in electric motors is similar to checking pressure in a pipeline.

To find out if the system has any leaks, you increase the water pressure and that way you can find leaks more easily, if in fact they exist.

In the case of electricity, voltage replaces pressure. In the insulation test a relatively high direct current voltage is used to make the leakage current more evident.

Hence you may be asking yourself: but can’t this damage the electric motor? And we answered: it could if the tension was not controlled, tailored.

But the test instruments are designed so that the electrical voltage does not harm the engine. And especially the operator does not receive dangerous electrical currents as a result of accidental contact.

Why do an insulation resistance test on electric motors?

We can say that the most important reason to carry out this test is to ensure the safety of everyone.

When the insulation resistance test on electric motors is performed, the chances of a short circuit occurring are reduced.

These short circuits can be fatal. And in the event of a ground wire short, it can cause a fire.

Another important reason to do the insulation resistance test on electric motors is the preservation and prolongation of the equipment’s useful life.

Periodic tests can provide information about the state of deterioration, thus helping to predict likely failures in the electric motor system.

And the repair done will help to preserve the electric motor, making it run longer.

Tips for an efficient insulation test on electric motors

Before starting the test, disconnect all electronic devices such as transmitters, motor drives, etc.

This measure prevents electronic devices from being damaged by applying a higher voltage than those that are used to working.

The temperature must be considered. The recommendation is that the tests be carried out at a standard temperature for the conductor of 20 ° C.

Or that the reference temperature is stabilized while future readings are compensated using an infrared thermometer or a digital multimeter.

Take care not to force the tension too much. The goal is to force, but without exaggeration.

The ideal is to test the insulation at twice the voltage to which the motor is subjected.

For example, if the equipment is rated for 460 V at 600 V, it can be tested at 1,000 V.

When using an insulation tester, leave the terminals connected at the end of the test.

Thus, the insulation tester can discharge any residual voltage.

Although the current is limited, an insulation tester on electric motors can generate sparks and cause small but painful burns. Surprise can cause the operator to jerk.

The ideal is to always work away from live systems and use safe work practices.

About Geartech BR

So, did you like the tips? Do you work with electric motors or serve customers who work with this type of equipment? So contact Geartech BR now.

Our company currently occupies a prominent position in the country importing films, polyester compounds, papers and insulating tapes.

We have been in this business since 2001, importing and marketing a wide variety of high quality products for industries and resellers across the country.

We only import and sell certified products of excellent origin, in order to meet expectations and achieve the satisfaction of our customers.

We are at your disposal!


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