Hi jghrist,
Firstly, zero sequence current exist only when there is an unsymmetrical fault and returns through the ground.
In a power system distribution there could be several grounding electrodes which could be interconnected in a earthing ring and may be connected to the star point(neutral...
castresin dry type transformers:
They only make use of flame retardent inorganic material which free the transformers from all restriction that applied to oil filled electrical equipment such as oil collecting pit, firewalls, fire extinguishing equipment etc.
These transformers can be used for...
Hi Wilson, (to your answer to jghrist)
The base impedance per phase of a balanced 3phase system is
Zb=(KVb/sqrt3)*1000/sqrt3*Ib
=KVb^2/MVAb
where KVb is line to line base KV and MVAb is a 3phase MVA.
Zb is always a per phase value (if the numerator is per phase KV then the denominator is per...
