Final answer:
The question is about calculating the sending end voltage and the line current in a three-phase transmission system with given impedance, receiving end voltage, and power with power factor information. The required calculations involve complex power concepts in electrical engineering and specific formulas, which are unfortunately not provided in the reference material.
Step-by-step explanation:
The student is asking to calculate the sending end voltage and the line current for a three-phase short transmission system. Given the per-phase impedance of 0.2 + j0.1 Ohms, receiving end voltage of 13.8 kV, and power delivered at the receiving end as 12 MVAR total at a 0.8 power factor leading, these calculations require the use of complex power concepts from electrical engineering.
Unfortunately, the information provided in the reference material does not offer the relevant formulas or context required to accurately answer this specific question. To calculate the sending end voltage and line current, one would typically employ the following equations in electrical engineering:
- Complex power S = P + jQ, where P is the real power and Q is the reactive power.
- The line current I can be found using S = VI*, with V being the phase voltage and I* the complex conjugate of the line current.
- Finally, the sending end voltage can be determined with V_s = V_r + IZ, where V_s is the sending end voltage, V_r is the receiving end voltage, Z is the line impedance, and I is the calculated line current.
However, in the absence of the exact formulas and steps here, a precise calculation cannot be provided.