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What is the speciality of the inverter output transformer? Why it is provided? 

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a) This eliminates all 3rd harmonics in the output voltage. 

b) Solid earthed neutral is required for the inverter output, hence the interconnected star winding is essential. 

c) The primary has to be star (not delta), since 3 separate inverters operate on isolated primary winding. 

d) Delta connection will cause circulating current between inverters during unbalanced faults. The inverters cannot withstand this. 

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