fault level?

Question

what is the fault level in the HT 11 kv line how to calculate

Answer 1

From J and P Switchgear Book I quote:-
Short circuit MVA is given by:-
(tranformer kVA x 100) / (% reactance X 1000)

In layman`s terms , if there is a short circuit supplied by a transformer, the fault level (short circuit MVA) is calculated using this formula.

% reactance is the impedance of the transformer supplying the fault.
Short circuit MVA is the fault level.

From this, fault current could be calculated as voltage is known.

Hope this helps----broad subject to cover.