A three-phase transmission line is 160 km long and supplies a load of 12 MW at 0.85 power factor lagging at 80 kV, 50 Hz. Each conductor has a resistance of 0.275 Ω / km, an inductive reactance of 0.5625 Ω / km and a capacitance to neutral of 0.008625 µF / km. Calculate the line- to-line sending end voltage and the sending end current, using: i. The nominal T method. ii. The nominal Π method. If the sending end voltage remains constant, estimate the approximate rise in voltage at the receiving end when the load is switched off. Hence calculate the per unit voltage regulation of the transmission line.
Short Transmission Line
A short transmission line is a transmission line that has a length less than 80 kilometers, an operating voltage level of less than 20 kV, and zero capacitance effect.
Power Flow Analysis
Power flow analysis is a topic in power engineering. It is the flow of electric power in a system. The power flow analysis is preliminary used for the various components of Alternating Current (AC) power, such as the voltage, current, real power, reactive power, and voltage angles under given load conditions and is often known as a load flow study or load flow analysis.
Complex Form
A power system is defined as the connection or network of the various components that convert the non-electrical energy into the electric form and supply the electric form of energy from the source to the load. The power system is an important parameter in power engineering and the electrical engineering profession. The powers in the power system are primarily categorized into two types- active power and reactive power.
A three-phase transmission line is 160 km long and supplies a load of 12 MW at 0.85 power
factor lagging at 80 kV, 50 Hz. Each conductor has a resistance of 0.275 Ω / km, an inductive
reactance of 0.5625 Ω / km and a capacitance to neutral of 0.008625 µF / km. Calculate the line-
to-line sending end voltage and the sending end current, using:
i. The nominal T method.
ii. The nominal Π method.
If the sending end voltage remains constant, estimate the approximate rise in voltage at the
receiving end when the load is switched off. Hence calculate the per unit voltage regulation of
the transmission line.
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