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What is the R phase voltage and Y phase voltage when only T3 and T4 are conducting? Consider a star connected balanced R load.

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in Power Electronics by (27.1k points)
What is the R phase voltage and Y phase voltage when only T3 and T4 are conducting? Consider a star connected balanced R load.

(a) Vs, -Vs

(b) Vs/2, -Vs/2

(c) –Vs/2, Vs/2

(d) –Vs, Vs

I got this question in an internship interview.

The above asked question is from 3-Phase Bridge Inverters-3 topic in division Inverters of Power Electronics

1 Answer

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by (45.1k points)
Right answer is (c) –Vs/2, Vs/2

Explanation: When T3 and T4 are conducting, R phase is connected to the negative bus through the T4 SCR and the Y phase is connected to the positive bus through the T3 SCR. Considering that the load is a balanced R load.

Devices

T1

T1

0

T4

T4

0

T1

T1

0

T6

0

T3

T3

0

T6

T6

0

T3

0

T2

T2

0

T5

T5

0

T2

T2

VYN = Vs/2

VRN = -Vs/2.

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