Why Diffrential and Ref relays are used together although
Diffrential relay can protect Pri and Sec of Transformer
differance b|w ground, neutral&earth
how oltc works in rectiformers of higher rating (27 mva,200v dc,120kamps) please provide me full information with diaggram.
This is about the recent problem that we have faced in our project site. We have 6/7.5 MVA. 66/11kV three phase star - star power transformer. The neutral was solidly connected to the earthing mat. But because of high resistance of earthing mat (130 ohm on LV and 180 ohm on HV), one day LV side neutral earthing conductor melted and we had a huge damage. Can any one plz tell me what might happen when we connect power transformer neutral to the earthing mat which has high resistance (>100 ohm ) ?????
The sodium vapor lamp is not glows when it is connected a distance of 5 meters above from gearbox, why ?
flush point of transformer?
what happen when we add mentos in cold drink?& why?
why the emf of a cell more than the terminal voltage when the cell is delivering current?
what is battery impedance testing and how we perform this test with four wires.
Draw a circuit diagram in which if button is open we can use socket and bulb as a series test circit and if button is close than simple we can use socket as any load purpose.
whose the first invented AC voltage or DCvoltage
what are the applications of transistors with low dc gain, high dc gain and medium dc gain( beta)?
if power factor comes in leading & showing -0.95. Is there any effect on electrical system? if yes, then please tell me what would be the effects. & how long we keep power factor in leading. Keeping power factor in leading shows more KW & less KVA is it correct or not.