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Why do we use megger to measure earth resistivity although this value is very small?

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Question added by manzoor ummar , Electrical Engineer , Tata Consulting Engineers
Date Posted: 2016/08/17
Muhammad Usman
by Muhammad Usman , Electrical Maintenance Technician , Pak Arab Fertilizer limited

MEGGER IS use to apply  high amount of voltages to soil to chek restivity. whene any fault occure the large amont of current flow through earth pit to soil.. so its depend on soil restivity.. 

Muhammad Moiz ahmed
by Muhammad Moiz ahmed , Electrical Site Engineer , Rakan Trading &contracting Co.

To Provide good grounding with almost 0  resistivity.. ( to take current easy path whenvever faulty condition appears)

To verify the condition of Electrical insulation in minimum level of resistance, by applying selected voltages.

Mohammed Imran Ahmed Imran Ahmed
by Mohammed Imran Ahmed Imran Ahmed , Electrical Site Engineer , Anel Emirates General Contracting Co LLC

To check the insulation resistance of the cable from which we can understand the cable is healthy and it is applicable to energise 

Lyndon Martin Legaspi
by Lyndon Martin Legaspi , Building Electrician , Bouygues Batiment International

it is capable of measuring the flow of resistant thru the earth in which can provide a small value or zero current and be called a direct line current

Ammar Azhar
by Ammar Azhar , Trainee Engineer , Northern Power Generation Company Limited - TPS GENCO III

This device enable us to measure electrical leakage in wire. This device is basically use for verifying the electrical insulation level of any device like motors, cables and generator winding. 

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