In an unbalanced, three-phase, star-delta system has a frequency of 50 Hz, and CBA phase rotation.The phase impedances
of the load are as follows:
Zab =29.41∠ 54.69°Ω ; Zbc=25.61∠-38.66° Ω ; Zca =17.8 ∠ 51.84° Ω
The emf of the source is represented by:ec(t)=221.831 𝐬𝐢𝐧 (𝛚𝐭 +(𝟓𝝅/𝟏𝟖) ) V
Calculate the phase current,( Iab, Ibc & Ica) of the load in polar form.
Calculate the active power( Pab, Pbc , Pca) in phase AB of the load in phasor form.
Determine the line current,( Ia, Ib & Ic) in polar form.
If two wattmeters are connected in lines a and b respectively of the above circuit to
measure the active power,
Determine the reading of the wattmeter,(Wa) connected in line a.
Determine the reading of the wattmeter,(Wb) connected in line b.
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