Electrical Lectures
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 | By Edvard Csanyi
Energy and Power
5 Types of equipment which generates the most harmonics
Harmonic load currents are generated by all non-linear loads. This includes: Switched mode power supplies (SMPS) Electronic fluorescent lighting ballasts Variable speed drives (VSDs) Uninterruptible power supplies (UPS) Magnetic-cored devices… Read more
Apr 27, 2015 | By Edvard Csanyi
Maintenance
What to do if transformer has an excessive moisture content
The term “moisture” in the transformer industry is commonly used to indicate water which is absorbed in the paper or dissolved in the oil. Occasionally, the terms “water” or “water… Read more
Apr 24, 2015 | By Edvard Csanyi
Testing and Commissioning
What to check when commissioning variable speed drives
The main purpose of commissioning VSDs is to ensure that: The AC converter and motor have been correctly installed and meet the wiring and safety standards such as IEC 60364… Read more
Apr 22, 2015 | By Edvard Csanyi
Energy and Power
4 power transformer protection devices explained in details
The power transformer protection is realized with two different kinds of devices, namely the devices that are measuring the electrical quantities affecting the transformer through instrument transformers and the devices… Read more
Apr 20, 2015 | By Edvard Csanyi
Energy and Power
Detailed Overview of Power System Disturbances (Causes and Impacts)
To make the study of Power Quality problems useful, the various types of disturbances need to be classified by magnitude and duration. This is especially important for manufacturers and users of… Read more
Apr 17, 2015 | By Edvard Csanyi
Power Substation
Basic Stand-Alone Application of Reclosers
Reclosers are self-contained fault interrupting and reclosing devices, specifically designed for overcurrent protection in secondary distribution systems. Reclosers are situated in selected locations within the overhead distribution network. With the… Read more
Apr 15, 2015 | By Edvard Csanyi
Power Substation
Configurations and characteristics of distribution substations
Distribution substations come in many sizes and configurations. A small rural substation may have a nominal rating of 5 MVA while an urban station may be over 200 MVA. Figures… Read more
Apr 13, 2015 | By Edvard Csanyi
Electrical Lectures
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 | By Edvard Csanyi
Transformers
Network distribution transformers serving grid and spot networks
Network transformers, the distribution transformers that serve grid and spot networks, are large three-phase units. Network units are normally vault-types or subway types, which are defined as (ANSI C57.12.40-1982): Vault-type… Read more
Apr 08, 2015 | By Edvard Csanyi
Power Substation
Important primary distribution (radial and loop) system considerations
The primary distribution system is that part of the electric distribution system between the distribution substation and distribution transformers. It is made up of circuits called primary feeders or distribution… Read more
Apr 06, 2015 | By Edvard Csanyi
Energy Efficiency
3 Lighting Essentials You Can’t Deny
Lighting systems in industrial facilities can represent an attractive savings opportunity, especially if lighting systems have not been upgraded or maintained in the past five years. The most cost-effective approach for lighting… Read more
Apr 03, 2015 | By Edvard Csanyi
Energy and Power
Good voltage regulation and justified power factor correction
Power factor correction and voltage regulation are closely related. In many cases, the desired voltage regulation is costly to obtain. Larger or paralleled conductors to reduce voltage drop under load… Read more
Apr 01, 2015 | By Edvard Csanyi
