According to the Overhead Line Design Standard for Transmission & Distribution Systems TS-107 of South Australia Power Networks, a minimum clearance of 255mm between 11kV phase-phase conductors shall be maintained under all conditions. This rated voltage is allowed to vary up to 10%. A range of conductors with diameter of 8.3mm, 14.3mm or 29.3mm are available for use. Calculate the worst-case electric stress and comment on the result. Note that the breakdown strength of air is 3kV/mm Hint: Consider two bare conductors (representing two phases) of radius a, separated by distance d, with a voltage V between them. Figure 1 shows the resultant electric field intensity in the air space. Ar r r=0 E(r) = - Figure 1 The electric field in the air between the lines (a ≤r≤d/2) is given by: V V/m 2r In 2a r = d d-a a

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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.