In loss of charge method _______ is connected in parallel with the insulation _______ under test.
Right Answer is:
Loss of Charge Method
In the loss of charge method, a known capacitor is connected in parallel with the insulation resistance under test and an electrostatic voltmeter as shown in Figure. The capacitor is charged to a suitable voltage through a battery by throwing the switch SW to contact 1 and is then allowed to discharge through the insulation resistance under test by throwing the switch SW to contact 2. The terminal voltage across the capacitor is noted during the discharging of the capacitor over a considerable period of time.
The voltage across parallel combinations is measured using an electrostatic voltmeter. If the value of resistance R is very large, then capacitor C requires more time for discharging. In such cases, the process becomes time-consuming. This method can be used effectively for the measurement of high resistances, but it needs a capacitor with a high leakage resistance.