Protection Engineering Basics and Schemes Protection Engineering | Page 55
positive, earth contact as negative but guard contact remains guard contact.
Very simple operation, R x which is connected electrical equipment need to be check for the Insulation resistance, V is the voltage applied via megger IR tester, this voltage is generated by small built in generator in megger, due to R x and applied Voltage current flow in circuit, and due to this flown current and applied voltage we can easily detect R x
R x = V I
Now let suppose we apply 10Kv and get reading of 10T ohms, its means we inject