Eight most important distance relay characteristics (based on impedance comparison)

Some numerical relays measure the absolute fault impedance and then determine whether operation is required according to impedance boundaries defined on the R/X diagram. Traditional distance relays and numerical relays… Read more

Oct 31, 2018 | Edvard

4 special capacitor applications in EHV systems you should know about

There are many other applications in the industry where capacitors are used for power factor correction or energy storage purposes. These include arc furnaces, resistance welding equipment, single-phase capacitor start,…...

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Oct 26, 2018 | Edvard

Short circuit phenomenon you should understand

A short circuit in an electrical circuit is a part of the circuit that for some reasons has become “shorter” than it should be. The current in an electrical circuit… Read more

Oct 03, 2018 | Edvard

Relay settings and applying high-impedance differential busbar protection scheme

The most of HV busbur faults involve single phase and earth, but faults may arise from many different causes. The number of faults that stand out is between phases clear… Read more

Sep 12, 2018 | Edvard

The essentials of electrical distribution systems every engineer should know

Electrical distribution systems are an essential part of the electrical power system. In order to transfer electrical power from an alternating current (AC) or a direct current (DC) source to… Read more

Sep 03, 2018 | Edvard

The 4 most common switchgear-based substation types

The subject of this article is to discuss few most common types of MV/HV power substations based on the type of distribution switchgear, which can be seen in every distribution… Read more

Aug 29, 2018 | Edvard

The fundamentals of protection relay co-ordination and time/current grading principles

Transmission and distribution systems are exposed to overcurrent flow into their elements. In an electric power system, overcurrent or excess current is a situation where a larger than intended electric… Read more

Aug 13, 2018 | Edvard

The network of data acquisition in a digital substation

The data acquisition in electric power system is very important and includes a lot of areas such as substation. Digital substation is one of the key parts of smart grid… Read more

Jul 30, 2018 | Edvard

Concerns over electromagnetic fields below three-phase high voltage overhead lines

In relation with the increased use of mobile phones during the last decades more concerns about possible harmful effects of electro-magnetic fields to human beings have been expressed. Overhead lines… Read more

Jul 16, 2018 | Edvard

How Arc suppression reactors (Earth fault neutralisers or Petersen-coils) work?

Arc-suppression reactors are also named earth fault neutralisers or Petersen-coils after W. Petersen who launched the idea of this particular reactor application early in the previous century. In high voltage… Read more

Jun 25, 2018 | Edvard