The following figure represents a simplified model of the power supply to a load centre from a generating station. Determine the voltage at the generating station (Line-line) and the real/reactive power (3 phase) of the generator. Transformer j 11.90 ohms (per phase) 345 kV side; 13.8/345 kV 500 MVA Delta Y-Grounded. (Series resistance, shunt resistance and reactance are neglected). Solve in Per Unit; 345 kV, 500 (3 phase) MVA base in line. Line Z= 9.52+j47.6 ohms (per phase ) Transformer impedance is for a line-neutral model. 2. tiz Gen. Station Load Transmission Line 3 Phase slack 400 MW Transformer 80 Mvar Load Voltage 329.41 kV Line-Line

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Dielectric Breakdown

A dielectric is a material with low electrical conductivity and so is classified as an insulator. Dielectric materials are used to block the flow of electricity through them, allowing them to behave as an insulators. They can also be used to store electric charge or improve capacitance.Dielectrics have no free electrons for conduction because electrons are tightly bound to the nucleus. Because dielectrics contain a small number of electrons for electrical conductivity, they have a dipole. The two primary roles of dielectrics in electrical devices are insulation and electrical energy storage. An electric field polarizes the dielectric, and the polarization of the molecules allows dielectric materials to store charge.