The two sections of an 11 kV busbar are connected by a reactor with a through load rating of 25 MVA and a reactance phase of 10

Question

The two sections of an 11 kV busbar are connected by a reactor with a through load rating of 25 MVA and a reactance phase of 10 based on 25 MVA Each section is connected by a 20 MVA transformer having a reactance of 10 on 20 MVA to a 33 kV busbar which is not sectionalized Connected to this 33 kV busbar are two generator transformer sets each rated at 37 5 MVA and each having a total reactance of 25 on 37 5 MVA The 33 kV busbar is connected to the 132 kV grid bus by two identical transformers in parallel each rated at 45 MVA and having a reactance of 12 5 on 45 MVA The 3 phase fault level infeed from the grid is 2000 MVA a Calculate the 3 phase fault level MVA at the 11 kV busbar with and without the reactor reactor short circuited and at 33 kV busbar

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