William Cheung

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Preparing to synchronize a generator to the grid

Conditions<p><i>In order to synchronize a generator to the grid, four conditions must be met:</i><p>Phase Sequence<br>• Voltage Magnitude<br>• Frequency<br>• Phase Angle<p>1. Phase …

Capacitor Banks In Power System (part four)

Continued from technical article: <b>Capacitor Banks In Power System (part three)</b><p>PF correction for loads connected on captive Diesel Generator (DG)<p>Let us …

Three phenomenons in the iron of AC machines

Magnetic Circuits<p>Most of our practical <b>AC machines</b> (motors, generators ad transformers) depend heavily on the magnetic field for operation. The core …

Transformer Routine Dielectric (Insulation) Test

Insulation tests to be performed<p>The following <i>insulation tests</i> are performed in order to meet the transformer insulation strength expectations. Unless …

Time-Current Curves

How fast a breaker will trip<p>Time-current curves are used to show how fast a breaker will trip at any magnitude of current. The following illustration …

Erection Procedure for Power Transformer

This technical article deals with transformers and <i>their installation</i> so we restrict ourselves here to the procedures associated with their …

Engineering

PLC Programming Training

PLC and Ladder (LAD) Logic Diagram<p>A <b>Programmable Logic Controller – PLC</b>, also known as programmable controller, is the name given to a type of …

Switching contactor and effect of long control lines

Voltage drop<p>In accordance with <b>IEC 60947-4-1</b> and <b>IEC 60947-5-1</b>, the normal control voltage range of power and control contactors lies <b>between 85 … 110 %</b> …

High voltage substations overview (part 1) | EEP

High voltage substations are <b>interconnection points</b> within the power transmission and distribution systems between regions and countries.<p><b>Different</b> …