Q1. The following figure shows the power transformer differential protection with AY connection with specifications of 20 MVA,66/11 KV. if a single-phase short circuit occurs on phase a once at location F1 and again at location F2, current 9000A will flow. Desirable: The currents passing through the relays R, Y, B? TMS If these relays are three overcurrent relays with inverse characteristics as t= And if their adjustment Iset Log10(7 values are Iset= 0.5 A and TMS= 0.21, will the relays work for such a short circuit? If yes, which relay works faster and when? 200/1 66KV 11KV 2000/1 20MVA F2 F1 %23 a b C

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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.