Megger

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megger
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TEAM
MEMBERS
AAFAQ ALTAF WANI
ABHIJIT KUMAR
ADITI D.A.
ANAMIKA BASU
YAQOOB QASIM
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• CONTENTS -
• Megger (Introduction)
• Construction of megger.
• Working principle of megger.
• Main Parts
• Types of megger.
• Uses of megger.

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MEGGER (Introduction)

• Megger is a measuring device
• Megger is expert in ground earth testing
• It gives high accuracy
• Megger tester are easy to use and having
  lightweight

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Construction of megger
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Working principle of megger

• Voltage for testing produced by hand operated
  megger by rotation of crank in case of hand
  operated type, a battery is used for electronic
  tester.
• 500 Volt DC is sufficient for performing test on
  equipment range up to 440 Volts.
• 1000 V to 5000 V is used for testing for high
  voltage electrical systems.
• In hand operated megger electromagnetic induction
  effect is used to produce the test voltage i.e.
  armature arranges to move in permanent magnetic
  field or vice versa.

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Main Parts -
Control and Deflecting coil They are normally
mounted at right angle to each other and
connected parallel to the generator. The
polarities are such that the torque produced by
them is in opposite direction. Permanent
Magnet Permanent magnet with north and south
poles to produce magnetic effect for deflection
of pointer. Pointer and scale A pointer is
attached to the coils and end of the pointer
floats on a scale which is in the range from
zero to infinity. The unit for this is
ohms. D.C generator or battery
connection Testing voltage is supplied by hand
operated D.C generator for manual operated Megger
and a battery and electronic voltage charger for
automatic type Megger. Pressure coil and current
coil Provided for preventing damage to the
instrument in case of low external source
resistance.
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Types of Megger

• Electronic Type (Battery Operated)
• Manual Type (Hand Operated)

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Electronic type Megger

• Digital Display - 
• Wire Leads - 
• Selection Switches - 
• indicators - 

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Hand operated megger

• Analog display- 
• Hand Crank-
• Wire Leads- 

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Uses of megger

• Insulation of any electrical system decreased
• To minimize the error we use megger
• To determine the Leakage current
• It is used for verifying the Insulation level

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