Q1. The offset mho distance relay is used to protect a transmission line. Such a relay has ZR = 20/80 ohms and is supplied from a current transformer with 4500/1 ratio and a voltage transformer with 1100/1 ratio. The mixing transformer ratio n is given as 0.3. (i) Calculate the reach of the relay if the line it is protecting has an impedance of 0.4/70 ohms per phase per km. (ii) If an earth fault occurs at 9 km along the transmission line, estimate the values of fault resistance limit which will enable the relay to function correctly.
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.
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