# Essential Basics of Total Harmonic Distortion (THD)

For a signal y, the total harmonic distortion (THD) is defined by the equation: This definition complies with that of standard IEC 61000-2-2. Note that the resulting value may exceed… Read more

Jul 22, 2015 | Edvard

# What can a PLC do? Why do we use them?

“PLC” means “Programmable Logic Controller”, that’s clear. The word “Programmable” differentiates it from the conventional hard-wired relay logic. It can be easily programmed or changed as per the application’s requirement…. Read more

Jul 15, 2015 | Edvard

# 4 Main Means For The Generation Of Reactive Power

The four main means for the generation of reactive power are: Synchronous alternators Synchronous compensators (SC) Static var compensators (SVC) and Banks of static capacitors Synchronous alternators are the main… Read more

Jun 29, 2015 | Edvard

# Basics of DC Motors For Electrical Engineers – Beginners

Separate field excitation DC motors are still sometimes used for driving machines at variable speed. These motors are very easy to miniaturize, and essential for very low powers and low… Read more

Jun 15, 2015 | Edvard

# Cable Sizing Of Sub-Main Electrical Circuits (Working Examples)

A sub-main electrical circuit can be defined as a circuit connected directly from the main LV switchboard to a sub-main distribution panel or a rising main for final connection of the minor… Read more

Apr 29, 2015 | Edvard

# Back To School – Let’s Calculate Current I3

Referring to the following circuit, calculate direct current I3: Using Kirchhoff’s laws; Using nodal analysis; Applying Thévenin’s theorem at nodes A and B. – KCL stands for Kirchhoff’s Current Law… Read more

Apr 10, 2015 | Edvard

# Miniature Circuit Breakers (MCBs) For Beginners

This technical article focuses on the widely used miniature circuit breakers rated for 240 V or less. These are smaller and lower-rated versions of industrial-grade molded-case circuit breakers rated for… Read more

Jan 26, 2015 | Edvard

# The choice of system voltage according to ANSI standard C84.1

The selection of system voltages is crucial to successful power system design. Reference lists the standard voltages for the United States and their ranges. The nominal voltages are given in Table… Read more

Aug 20, 2014 | Edvard

# 2 Most Common Contributing Factors In Motor Insulation Failure

The most frequent failure in electrical equipment is the degradation and breakdown (flashover) of the insulation. Electrical insulation can be liquid or solid, organic or inorganic. Organic insulation material consists… Read more

Jun 25, 2014 | Edvard

# Short-circuit switching (making / breaking) capacity

The switching capacity is the r.m.s value of a current at a given power factor cos φ as well as a given rated voltage at which a switchgear or a… Read more

Feb 10, 2014 | Edvard