Question #223618

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:

**Z**_{ab}** =29.41∠ 54.69°Ω ; Z**_{bc}**=25.61∠-38.66° Ω ; Z**_{ca}** =17.8 ∠ 51.84° Ω**

The emf of the source is represented by**:e**_{c}**(t)**=**221.831 𝐬**𝐢𝐧 (𝛚𝐭 +(𝟓𝝅/𝟏𝟖) ) **V**

Calculate the phase current,( **I**_{ab,} **Ibc & Ica**) of the load in polar form.

Calculate the **active power**( **P**_{ab, }**P**_{bc , }**Pca**) in phase AB of the load in phasor form.

Determine the **line current**,( **I**_{a, }**I**_{b & }**I**_{c}) 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**,(**W**_{a}) connected in line** a.**

Determine the **reading of the wattmeter**,(**W**_{b}) connected in line** b.**

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