NEC Electronics · 2081 · Question 26

Which among the following is the correct expression for star-to-delta conversion from star resistances Ra, Rb, and Rc?

Star-Delta Transformation

AR1=Ra*Rb/(Ra+Rb+Rc), R2=Rb*Rc/(Ra+Rb+Rc), R3=Rc*Ra/(Ra+Rb+Rc)
BR1=Ra/(Ra+Rb+Rc), R2=Rb/(Ra+Rb+Rc), Rc=/(Ra+Rb+Rc)
CR1=Ra+Rb+Ra*Rb/Rc, R2=Rc+Rb+Rc*Rb/Ra, R3=Ra+Rc+Ra*Rc/Rb
DR1=Ra*Rb/Rc, R2=Rc*Rb/Ra, R3=Ra*Rc/Rb
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