HISTORY OF MEGGER


History of Megger

The device is being used since 1889, popularity raised during 1920s since the long back device is same in its uses and purpose of testing, few real improvements appeared in recent years with its design and quality of tester. Now high-quality options are available which are easy to use and quite safe.

What is Megger?

Insulation resistance IR quality of an electrical system degrades with time, environment condition, i.e., temperature, humidity, moisture and dust particles. It also gets impacted negatively due to the presence of electrical and mechanical stress, so it’s become very necessary to check the IR (Insulation resistance) of equipment at a constant regular interval to avoid any measure fatal or electrical shock.




Uses of Megger
The device enable us to measure electrical leakage in wire, results are very reliable as we shall be passing electric current through device while we are testing. The equipment basically uses for verifying the electrical insulation level of any device such as motors, cables, generators, windings, etc. This is a very popular test being carried out since very long back. Not necessary it shows us exact area of electrical puncture but shows the amount of leakage current and level of moisture within electrical equipment/winding/system.

Types of Megger

This can be separated into mainly two categories:-
1.     Electronic Type (Battery Operated)
2.     Manual Type (Hand Operated)
But there is another types of megger which is motor operated type which does not use battery to produce voltage it requires external source to rotate a electrical motor which in turn rotates the generator of the megger.
electronics megger

 

Electronic Type Megger

Important parts:-
·        Digital Display :- A digital display to show IR value in digital form.
·        Wire Leads :- Two nos of wire leads for connecting megger with electrical external system to be tested.
·        Selection Switches :- Switches use to select electrical parameters ranges.
·        Indicators :- To indicates various parameters status i.e. On-Off. For Example Power, hold, Warning, etc.
·        Note: – Above construction is not similar for every megger, it difference appears manufacture to manufacture but basic construction and operation are same for all.

Advantages of Electronic Type Megger

  • Level of accuracy is very high.
  • IR value is digital type, easy to read.
  • One person can operate very easily.
  • Works perfectly even at very congested space.
  • Very handy and safe to use.

Disadvantages of Electronic Type Megger

  • Require an external source of energy to energies i.e. Dry cell.
  • Costlier in market.

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