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A generator is connected to a transformer which feeds another transformer through a short feeder (the given figure).The zero sequence impedance values are expressed in pu on a common base and are shown in the figure. The Thevenin equivalent zero sequence impedance at point B is
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- 0.8 + j 0.6
- 0.75 + j 0.22
- 0.75 + j 0.25
- 1.5 + j 0.25
Correct Option: B
Zero sequence impedance diagram of the given power system can be drawn as follows: 
Equivalent zero sequence impedance
= 3 × 2.5 + j 0.1 + j 0.05 + j 0.07
= 0.75 + j 0.22
