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There are basically two types of meggers, an electronic one and the old-fashioned hand-cranked type. On the whole megger testing is non-destructive.
What happens is a DC voltage is applied to the device or winding under test. It is basically an insulation test to see if the insulation has been injured in any way to cause a short circuit when normal power is applied to it.
On some meggers there are 3 ranges 300V, 750V, and 1000 volts. Applying the proper voltage is essential to avoid damaging the device you are testing.
Working voltages up to 240 volts should use the 300 range. Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range.
If you used the 1000 volt range on a device that had a working voltage of only say 24 volts, you could damage the insulation of the device just by testing it! So meggering a device is only non-destructive if you use the tester as its instructions tell you to.
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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.
Before you do any work yourself,
on electrical circuits, equipment or appliances,
always use a test meter to ensure the circuit is, in fact, de-energized.
IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.
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BlakeOn the whole megger testing is non destructive. What happens is a DC voltage is applied to the device or winding under test. It is an insulation test to see is the insulation has been injured in any way to cause a short circuit when normal power is applied to it. On my megger there are 3 ranges 300V, 750V, and 1000 volts. Applying the proper voltage is essential to not damaging the device you are testing. Working voltages up to 240 volts should use the 300 range. Working voltages up to 600 volts use the 750 volt range and working voltages above 600 use the 1000 volt range. As you can see if you used the 1000 volt range on a device that had a working voltage of say 24 volts you could damage the insulation just by testing it. So meggering a device is non destructive if you use the tester as its instructions tell you to.
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Where can one purchase an electrical tester?
One can purchase an electrical tester at Amazon. Amazon has a wide variety of these, so there are many options to choose from. Like Amazon, Fluke also sells a wide variety of electrical testers.
What value of tester is to be used for measuring insulation resistance of three phase 600V cables?
The typical test equipment for this is a megger. The megger is connected to two conductors at a time to test the insulation between the two.
What is a Megger 1552 used for?
The Megger MFT 1552 is a combined electrical circuit tester which includes test features for Insulation testing, Earth loop impedance tests, RCD Testing and Continuity testing. It comes supplies with full Calibration Certificate.
What meters are kept on HV side in SC test?
insulation tester (Megger) can used to checked the short circuit on HV side. HI POT tester is also a means to checked the shot circuit in HV cable.
Can a high voltage transformer be megged with a megger meter?
No. A megger's output voltage is not high enough to test the insulation of a high-voltage transformer if, by 'high-voltage transformer ', you mean a distribution transformer or power transformer. Instead, a high-voltage test set or 'pressure tester' (e.g. a 'HiPot' tester) must be used, as these produce far higher voltages.
