QUESTION ONE (a) A 3-phase line having an impedance of (5 + j20) ohm per phase delivers a load of 30 MW at a p.f., of 0.8 lag and voltage 33 kV. Determine the capacity of the phase modifier required to be installed at the receiving end if the voltage at the sending end is to be maintained at 33 kV. (b) Determine the tap ratio in problem (a) if the receiving end voltage is to be maintained at 0.92 p.u. of the sending end voltage. The line is fed through a 33/220 kV transformer. Assume tstr = 1.
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.
QUESTION ONE
(a) A 3-phase line having an impedance of (5 + j20) ohm per phase delivers a load of 30 MW
at a p.f., of 0.8 lag and voltage 33 kV. Determine the capacity of the phase modifier
required to be installed at the receiving end if the voltage at the sending end is to be
maintained at 33 kV.
(b) Determine the tap ratio in problem (a) if the receiving end voltage is to be maintained at
0.92 p.u. of the sending end voltage. The line is fed through a 33/220 kV transformer.
Assume ???? = 1.
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