one plant description :
4 gtg 42 MW(11/33 transformer)
sc level 31.5 KA
load 100 MVA
-we have big motor 11 kv 7MW , with transformer 10MVA 33/11 delta /star and earth fault 30A( star point to earth with resistance)
-for 6KV taransformer earth fault is 50A( star point to earth with resistance)
-for 400 v star point is solidly earth.
i want to know how can i calculate erath fault level in transformer 11/33 ., in fact ? current (star point to earth)??
4 gtg 42 MW(11/33 transformer)
sc level 31.5 KA
load 100 MVA
-we have big motor 11 kv 7MW , with transformer 10MVA 33/11 delta /star and earth fault 30A( star point to earth with resistance)
-for 6KV taransformer earth fault is 50A( star point to earth with resistance)
-for 400 v star point is solidly earth.
i want to know how can i calculate erath fault level in transformer 11/33 ., in fact ? current (star point to earth)??