Answer / k.prakashchandra

The midpoint of rectifier transformer secondary is
earthed.The potential of ground is taken as +/- 0.The
voltage measured between any terminal wrt ground will be +/-
half the full voltage.This method is helpful to trace a
single polarity and for earth fault locator.

Answer / saad

Dear K.prachash can u please explain the DC battery 12volts
directly connected to load but when we check its voltage
with respect to ground that half moreover i cant understand
the rectifier transformer.
Thanks for ur time and consideration.

Answer / sarvesh kotiyal

Because your Ground is not connected with V-(V- which is taken as reference point). when you check Voltage respect to ground that time you should also check the resistance between V+ to E & V -E which is equal(the Value which is higher than 10 mega ohm ).
Simple apply voltage Divider & you will get half Voltage

Answer / koti

The value shown is a capacitive value i.e it is due to capcitance effect wyou are getting some value. If you put a lamp it will not glow.

Answer / k.prakashchandra

The above answer is correct.If you use an earth fault
indicator ,you are able to measure voltages. And if you run
both leads along the ground or a metal surface ,you can
measure voltages with a digital voltmeter ,as the
capacitances between the leads and the surface/ground, bring
the surface/ground to +or- zero potential.

Answer / sarvesh kotiyal

the resistance between the supply and ground is very high(1-5gohm). so Ideally it should not show any voltage but Internal Input resistance of multimeter approx 10 Mohm for Voltage measurement which is almost a short circuit in comparison to earth .so when you check voltage with respect to earth
V + to E = 24 * 10/10+10 = 12 V.

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