Choosing a Megger Tester for Hipot Testing

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A popular method of determining insulation reliability is through high potential testing. This test is simple to conduct and gives a pass/fail result. This test method is done by applying a very high voltage to the test sample. Ideally, good insulation should be able to resist the current applied. However, if the insulator has deteriorated, the insulation may break down and cause the whole component to fail.

There are two types of high potential testing according to the output voltage. These are the AC and DC hipot testers. AC hipot is used in finding faults in commissioned electrical components. This test is for preventive maintenance which allows the technician to anticipate repairs needed in the electrical system. DC hipot on the other hand, is used for new cables/electrical components before installation. This test is for quality control to ensure that the components installed will work properly and meet their specifications. The applied voltage is 1.414 times higher than AC high potential testing. DC high potential testing is not suitable for testing old electrical components that have been in operation for a while because of premature failure.

If you are planning to invest in a hipot tester, consider Megger. The Megger 230315, Megger 230415 and Megger 230425 are hipot testers that are safe and simple to use. They readily adapt to production, development and preventive maintenance testing. The output voltage is variable from 0 to the maximum output voltage which allows you to test a wide variety of insulators with different breakdown voltages. They also feature an automatic cut-off of the output voltage within 50 ms of arcing.

Megger 230315 Hipot Tester

This hipot tester has a maximum output voltage of 3 kV which makes it suitable for testing low and medium voltage equipment. 

Features

  •        Interlock switch that prevents the output voltage to be applied if the ground connection is open
  •        Visual indicator that confirms proper connection of leads
  •        Auto-shutdown if the sample’s resistance exceeds 15 Ω
  •        Ground continuity check
  •        Adjustable leakage current trip from 0.3 to 12 mA
  •        Selectable 1 second or continuous testing
  •        Recessed high-voltage terminals for extra safety
  •        Zero start/reset in case of an event failure
  •        Variable voltage output from 0 to 3 kV
  •        NEMA5-15R receptacle 
  •        ± 2% test voltage accuracy 
  •        12.5 lbs

Megger 230415 Hipot Tester

This tester is similar with the Megger 230315 but has a maximum output voltage of 4 kV. The higher output voltage allows you to test cables and other equipment with a higher breakdown voltage.

Features

  •        Interlock switch that prevents the output voltage to be applied if the ground connection is open
  •        Visual indicator that confirms proper connection of leads
  •        Auto-shutdown if the sample’s resistance exceeds 15 Ω
  •        Ground continuity check
  •        Adjustable leakage current trip from 0.3 to 12 mA
  •        Selectable 1 second or continuous testing
  •        Recessed high-voltage terminals for extra safety
  •        Zero start/reset in case of an event failure
  •        Variable voltage output from 0 to 4 kV
  •        NEMA5-15R receptacle 
  •        ± 2% test voltage accuracy 
  •        12.5 lbs

Megger 230425 Hipot Tester

The Megger 230425 can function as an AC or DC hipot tester. This makes it suitable for both preventive maintenance and quality control of insulation. It has a maximum output voltage of 5 kV which allows you to test various electrical equipment.

Features

  •        Interlock switch that prevents the output voltage to be applied if the ground connection is open
  •        Visual indicator that confirms proper connection of leads
  •        Auto-shutdown if the sample’s resistance exceeds 15 Ω
  •        Ground continuity check
  •        Adjustable leakage current trip from 0.3 to 12 mA for AC mode
  •        Adjustable leakage current trip from 0.4 to 17 mA for DC mode
  •        Selectable 1 second or continuous testing
  •        Recessed high-voltage terminals for extra safety
  •        Zero start/reset in case of an event failure
  •        Variable voltage output from 0 to 4 kV AC
  •        Variable voltage output from 0 to 5 kV DC
  •        ± 2% test voltage accuracy 
  •        13.5 lbs

Protec Equipment Resources has a wide selection of electrical test equipment available for rent, lease or for sale. You can reach us at 1-866-352-5550 for more details.