Single phase and three phase capacitive-load switching in transmission & distribution systems

The interruption of capacitive currents is a usual switching case, unlike the making and breaking of fault currents. The usual cases, in which a capacitive current is switched, are switching…...

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Aug 30, 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 zone selective interlocking logic of protection relays

This function significantly reduces the tripping time of the circuit breakers closest to the source. It can be used for zone selective interlocking (ZSI) in closed ring networks. It applies… Read more

Aug 27, 2018 | Edvard

Protocols applied for time synchronization in a digital substation automation

Substation automation is a mission-critical task and electric power utilities must synchronize across large-scale distributed power grid switches in a substation to enable smooth power transfer and maintain power supply… Read more

Aug 22, 2018 | Edvard

The study of harmonics and LV energy compensation

The harmonic currents are mainly down to the nonlinear loads in the installations. The most frequent harmonic sources are linked to the use of electric arcs (welding, arc furnaces, discharge… Read more

Aug 20, 2018 | Edvard

Practical tips on how not to burnout an electric motor

There are many reasons why an electric motor could start heating up. For example, when another starting duty is used than the informed one on the motor nameplate this may… Read more

Aug 15, 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 technology behind distributed control system (DCS) in a thermal power plant

A DCS is the heart of a thermal power plant’s instrumentation and control systems. DCS stands for ‘distributed control system’, and the term ‘distributed’ means that several processors are operating…...

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Aug 09, 2018 | Edvard

8 practical applications of testing ground system using clamp-on tester

First of all, it is extremely important that the operator/engineer understand the ground system that is being tested. The clamp-on measurement works well in many situations, but it has limitations… Read more

Aug 08, 2018 | Edvard

Generator earthing and stator earth fault protection

Generating unit is a pretty complex system made up of the generator stator winding, its transformer and unit transformer (if present), the rotor with its field winding and excitation system,… Read more

Aug 06, 2018 | Edvard