Electrical Education

The most common methods of measuring the resistance of an earth electrode

The most common methods of measuring the resistance of an earth electrode

When an earth electrode system has been designed and installed, it is usually necessary to measure and confirm the earth resistance between the electrode and “true Earth”. The most commonly… Read more EEP – Electrical Engineering Portal »

Three-phase Y and Delta Configurations | Polyphase AC Circuits

Initially we explored the idea of three-phase power systems by connecting three voltage sources together in what is commonly known as the “Y” (or “star”) configuration. This configuration of voltage sources is characterized by a common connection point joining one side of each source. (Figure below) Three-phase “Y” connection has three voltage sources connected to a common point. If we draw a... »

Vector Group of Transformer

Vector Group of Transformer Introduction: Three phase transformer consists of three sets of primary windings, one for each phase, and three sets of secondary windings wound on the same iron core. Separate single-phase transformers can be used and externally interconnected to yield the same results as a 3-phase unit. The primary windings are connected in one of several ways. The two most common con... »

Control of Synchronous Generators with Droop and Cross-Current Compensation.

Control of Synchronous Generators with Droop and Cross-Current Compensation. Details   Written by Stefanos Spanopoulos, MIET The excitation of a synchronous generator is usually done by an AVR (Automatic Voltage Regulator) that uses generator voltage and/or current as inputs in order to control its output to a pre-set value. AVRs include different control modes to optimise performance dependi... »

suppressing harmonic influences

Shrewd Ways To Cut Down The Influence Of Harmonics

Shrewd Ways To Cut Down The Influence Of Harmonics The influence of harmonics There are three possible ways of suppressing or at least reducing the influence of harmonics. The fourth way is a special case.  Reducing generated harmonic currents   Modifying the installation   Filtering   Special case – circuit breakers    1. Reducing generated h... »

Power Systems

Electrical Power Systems   Electric power systems are encompass devices that produce electrical energy and transmit this energy to consumers. An electric power system is a network of electrical components installed to supply, transfer, and use electric power. A modern electric power system has mainly six main components: Power plants which generate electric power; Transformers which raise or ... »

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