Primary and secondary power distribution systems (layouts explained)

Primary distribution systems consist of feeders that deliver power from distribution substations to distribution transformers. A feeder usually begins with a feeder breaker at the distribution substation. Many feeders leave… Read more

Mar 06, 2019 | Edvard

Three essential features of automation in power distribution systems

One may wonder why are everybody talking more and more about automation in power distribution. Aren’t we already automated? Well, we are not. It can always be better, faster, with…...

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Feb 28, 2019 | Edvard

Learn to recognize T&D pylons, foundations, insulators, cables, bushings and arresters

Recognizing the type of transmission & distribution pylons and their equipment is kind of hard if you don’t know where to look for. There are many variations that look similar… Read more

Feb 20, 2019 | Edvard

Connections and working principles of three-phase distribution transformers

A three-phase service can be supplied by one three-phase transformer unit or by interconnecting three single-phase transformer units. One three-phase unit is smaller than an equivalent size bank consisting of…...

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Feb 08, 2019 | Edvard

People response to short-term exposure to electric fields of AC transmission lines

Short-term exposures to electric fields produced by AC transmission lines and stations can be pretty serious and may be classified according to the type of effect causing a sensation in… Read more

Jan 30, 2019 | Edvard

Protection of a transformer directly connected to a transmission line without switchgear

A transformer-feeder include a transformer directly connected to a transmission line circuit without the intermediation of a HV switchgear. The saving in HV switchgear so achieved is unfortunately lowered by… Read more

Jan 28, 2019 | Edvard

Six MV/HV applications of series capacitors for improving the power quality

Series capacitors are connected in series in the circuit and therefore carry the full transmission line current. The series capacitor is actually a negative reactance in series with a transmission… Read more

Jan 23, 2019 | Edvard

The basic things about substations you MUST know in the middle of the night!

To explain in very simple words, I would say that substation is a bunch of electrical devices gathered and connected in one place. On top are clever electrical devices who… Read more

Jan 09, 2019 | Edvard

Directional protection relays applied to multiple power sources, parallel circuits and loops

Directional protection is usually applied to distribution systems that contain multiple power sources, parallel circuits and rings/loops. For such systems it is absolutely necessary to have protection against fault currents…...

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Dec 27, 2018 | Edvard

The Essentials Of Voltage Transformers (Advanced Theory and Practice)

The most common voltage sources for power system measurements and protections are either wound transformers (voltage transformers) or capacitive divider devices (capacitor voltage transformers or bushing potential devices). Some new… Read more

Dec 19, 2018 | Edvard