CT & VT neutral earthing

[yesukannan]

Hi all,
why in Current and Voltage Transformer the star point is earthed. that too checking for single point earthing what will happen if there is a duplicate earthing.




thanks
alaguraja

 

[IQ Electrical]

Hi all,
why in Current and Voltage Transformer the star point is earthed. that too checking for single point earthing what will happen if there is a duplicate earthing.




thanks
alaguraja

If the star point is not earthed, it will not be at 0V and then the neutral will not actually be 'neutral' and if a line-earth fault occurs, it is almost impossible for any protective device to operate on a primary fault.

 

[Knobhead]

You really need to look at the protection relay manufacturers information.
It’s a vast subject, not one that can be covered in a open forum.


View attachment 8860

Where do I start with this. You have to sit down and read. Sorry