Current Systems (AC/DC) And Voltage Levels Basics You Must Never Forget

There are many electrical engineering basics you really must know at any time, even in the middle of the night! The basics we will discuss here are current systems and… Read more

Nov 29, 2017 | Edvard

How To Choose System’s Earthing Point And What Is The Practice Throughout The World

Normally in directly earthed and effectively earthed systems every available neutral point is earthed. Deviations from this occurs when the transformers neutral points are left unearthed. This is done to… Read more

Nov 27, 2017 | Edvard

Secondary injection tests for checking the correct operation of the protection scheme

Secondary injection tests are always done prior to primary injection tests. The purpose of secondary injection testing is to prove the correct operation of the protection scheme that is downstream… Read more

Nov 22, 2017 | Edvard

Differential Protection Of Feeders For Transformers And Tee-Offs (Tapped Lines)

On transformer feeders, the transformer and line or cable are connected in series and form a unit. In this manner, one CB can be saved. On feeders with tee-offs, transformers… Read more

Nov 20, 2017 | Edvard

How To Control Reactive Power In Larger Electrical Plants With Multiple Incomers

Most compensation banks are controlled stepwise. For this purpose it is essential to ‘know’ when it is allowed to (de)activate a capacitor step by the power factor relay (controller). The… Read more

Nov 15, 2017 | Edvard

Overhead vs. Underground Residential Distribution Circuits. Which One Is ‘Better’?

This debate continues. Both designs have advantages (see Table 1). The major advantage of overhead circuits is cost. An underground circuit typically costs anywhere from 1 to 2.5 times the… Read more

Nov 13, 2017 | Edvard

We can load distribution transformer heavily when it is cold, but when it’s hot…

Distribution transformers (commonly mineral-oil-immersed type) are output rated and their loading and sizing guidelines of many utilities are based on ANSI/IEEE C57.91. Distribution transformers can deliver their rated kVA without…...

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Nov 09, 2017 | Edvard

Practical Basics Of Synchronous Motors That Every Electrical Engineer Should Know

Like the asynchronous motor, the synchronous motor consists of a stator and a rotor separated by the air gap. It differs from the asynchronous motor in that the flux in… Read more

Nov 08, 2017 | Edvard

Troubleshooting Transformer In Power Substation And Detailed Failure Investigation

Failure of transformer in power substation is not a sudden phenomenon, for that matter each and every failure will take place only after alerting through some pre-signs. If they went… Read more

Nov 06, 2017 | Edvard

How To Calculate and Draw a Single Line Diagram For The Power System

This technical article explains how to calculate and draw a single line diagram of the three-phase, 60-Hz system power system with generators, motors, transformers and lines. The following components comprise… Read more

Nov 01, 2017 | Edvard