Electrical Engineering ⇒ Topic : Megger
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Daniel
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Megger The megaohmmeter (or megger) is an instrument for measuring very high resistance such as the insulation resistance of electrical cables. A megger is essentially an ohmmeter with its own handcranked high voltage generator See Fig. (a). The generated voltage may be anything from 100 V to 2.5 kV. The high voltage source is required to pass a measurable current through the high resistance to he measured. figure (a) As in the case of ohmmeter, the scale of the megger indicates infinity (∞) when its terminals are open-circuited and zero when the megger terminals are shorted. When the unknown resistance is connected to megger terminals, it gives the value of resistance between zero and infinity The range of the instrument can be changed by switching different values of standard resistor in the circuit. | |
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