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Insulation Resistance Test Or Megger Test Procedures With Circuit Diagram marinesite.blogspot.in Suka
In this article we will go through Megger test first of all i want to say both insulating resistance tests and megger test are same. which is usually carries out to find the insulation of different machines windings conductor wires generator windings etc.
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Megger testing instrument is a high resistance Ohmmeter with a build in generator
It is equipped with three connections Line Terminal (L), Earth Terminal (E) and Guard Terminal (G) Resistance is measured between the Line and Earth terminals The “Guard” terminal is provided for special testing situations where one resistance must be isolated from another.
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The generator can be hand-cranked or line-operated to develop a high DC voltage which causes a small current through and over surfaces of the insulation being tested
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Importance Of Insulation Resistance Test Or Megger Test An insulation test is carried out to test the integrity of of the insulation between conductors.
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Which help to find the short circuit problems in the circuit circuit It also serves as the best guide to indicate the health of the equipment Procedure To tests the Insulation Test the megger before use, whether it gives INFINITY INFINITY value value when not connected, and ZERO when the two terminals are connected together and the handle is rotated.
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To do the test you ensure the cable is disconnected from any devices (megger normally work on 500v, 1000v testers for higher voltage testing).
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Instrument should be in normal working temperature because resistance is related to temperature. Ensure both ends of the cables are separated from each other (connect one end in terminal strip if necessary).
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Now connect the megger terminals to the conductors which has to be meassured Difference Between Safety Valve And Relief Valve
Then hand crank the generator and a high DC voltage generated which causes a small current through and over surfaces of the insulation being tested.
Insulation Resistance Test Or Megger Test Procedures With Circuit Diagram
If the Reading shows Infinity means the conductors having good insulation. Here it shows a megger circuit diagram
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Bijoy About The Author: He is a marine engineer sailing with ESM.He loves to share his views and opinion regarding marine exams and coordinate Marinesite. Apart from this he is having keen interest on blogging. You can catch him on Google+
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