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What is the R phase voltage when T1, T6 and T5 are conducting? Consider a star connected R load.

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What is the R phase voltage when T1, T6 and T5 are conducting? Consider a star connected R load.

(a) Vs

(b) 2Vs/3

(c) Vs/3

(d) –Vs/3

I have been asked this question in homework.

Asked question is from 3-Phase Bridge Inverters-2 topic in section Inverters of Power Electronics

1 Answer

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by (45.1k points)
The correct answer is (c) Vs/3

Easy explanation: They conducting SCRs can be represented as closed switches. The load terminals R and B are connected to the positive bus but the terminal Y is connected to the negative bus. VRN = VBN = Vs/3.

VYN = -2Vs/3.

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