Stop Transformer Noise With These Rules and Techniques

There are a number of basic installation precautions and transformer mounting techniques which if carefully noted and followed, will minimize the audible sound level (noise) of energized transformers. Some of… Read more

Nov 07, 2015 | Edvard

Electrical installations where use of TN-C-S system is prohibited

A real danger can arise when the non-current-carrying metalwork of an installation is connected to the system’s neutral, as is the case with a TN-C-S-fed system. The ground system is… Read more

Nov 06, 2015 | Edvard

The Node Voltage Method For Analysis Of Electric Circuits

Node voltage analysis is the most general method for the analysis of electric circuits. In this technical article, its application to linear resistive circuits is illustrated. The node voltage method… Read more

Nov 02, 2015 | Edvard

6 steps to establish electrically safe work condition

Equipment that has been deenergized and verified as such is said to be in an electrically safe work condition. Article 120.1 of NFPA 70E outlines six steps that must be… Read more

Oct 31, 2015 | Edvard

Protection of A.C. Electrified Railways

Many regional, urban and high-speed inter-urban rail networks worldwide are electrified, to provide the motive power for trains (Figure 1). The electrification system serves as the contact interface for current… Read more

Oct 30, 2015 | Edvard

Troubleshooting An Open Circuit Faults in the Control Circuit

The machine does not start when the start button is pressed. At this point the problem could be mechanical or electrical. We will focus on just the electrical circuit faults… Read more

Oct 26, 2015 | Edvard

Balancing of single-phase loads to achieve energy efficiency

All single-phase loads, especially those with non-linear characteristics, in an electrical installation with a three-phase supply should be evenly and reasonably distributed among the phases. Such provisions are required to… Read more

Oct 24, 2015 | Edvard

Eight Most Common Schemes To Supply MV Switchboard

Medium voltage networks are made up of switchboards and the connections feeding them. Let’s take a look at the eight different supply modes of these medium voltage switchboards. We’ll start with… Read more

Oct 23, 2015 | Edvard

Basic measuring devices explained through cute simple schemes

In this technical article, you should gain a basic understanding of the desirable properties of practical devices for the measurement of electrical parameters. The measurements most often of interest are… Read more

Oct 21, 2015 | Edvard

Phases and wires in distribution of AC power

AC power transmission is always at high voltage and mostly by 3-phase system. The use of single-phase system is limited to single-phase electric railways. Single-phase power transmission is used only… Read more

Oct 19, 2015 | Edvard

4 Things Soil Resistivity Depends On

Though the ground itself being a very large body can act as an infinite sink for currents flowing into it and can be considered to be having very low resistance to current… Read more

Oct 17, 2015 | Edvard

9 basic rules for dimensioning of electric circuits

Basically, the dimensioning process itself is easy to understand and can be performed using simple means. Its complexity lies in the procurement of the technical data on products and systems,… Read more

Oct 16, 2015 | Edvard

Testing Challenges in Large Ground Systems

Large ground systems, such as those found in substations and power stations, are an important part of the protection of the electricity supply network. They ensure that fault current will… Read more

Oct 12, 2015 | Edvard

10 Important Definitions Applied To Low Voltage Fuses

The simplest of all overcurrent protective devices are fuses. A fuse is an overcurrent protective device with a circuit-opening fusible part that is heated and severed by the passage of the… Read more

Oct 10, 2015 | Edvard

Few things that capacitors do perfectly

Capacitors provide tremendous benefits to distribution system performance. Most noticeably, capacitors reduce losses, free up capacity, and reduce voltage drop. Let’s go a little bit into details. By canceling the… Read more

Oct 05, 2015 | Edvard