Month: March 2011

Per Unit System – An Introduction

Fundamental to any power system analysis is the know-how of per unit systems. This article, part of a series of articles, will explain step by step how to calculate these parameters for any component anywhere in the power system. Let’s begin with the purpose.

Per unit system

The Power Flow Crux

The electrical power grid operates in equilibrium. The power supply from the generator matches the demand levied by the end-users. The flow of power to enable this demand-supply equilibrium over the transmission lines (T-lines) is governed by the following conditions.

Transmission Lattice Tower

AC vs. DC Power – The Basics

DC systems are great for moving bulk power at really high voltages. They are just not feasible for power distribution, however. AC systems provide easy means to deliver power to remote users from remote generating stations. A mix of both technologies is viable for the future power system.

AC vs. DC System

Power Transformers – Design and Application

Power transformers are widely used in a power system to transform voltage. The most common type, a two winding transformer, has one winding connected to a high voltage – low current circuit while the other winding is connected to a low voltage – high current circuit.

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