The basics of primary medium voltage switchgear
Primary medium voltage switchgear represents an important part within the primary distribution substation functionality. The switchgear works as a connection node between the outgoing distribution feeders and the in-feeding power transformers. The most common construction… Read more
Dec 14, 2015 | Edvard
Real time reactive compensation – A case with 5 problems and solutions
A car equipment manufacturer’s plant in Concord (Ontario, Canada) is supplied by a transformer rated at 2000 kVA – 27.6 kV / 600 V – Yy – Ucc = 5.23 %. It manufactures exhaust assemblies from steel… Read more
Dec 11, 2015 | Edvard
The Design Basics Of Motor Protection Circuit Breaker
Application-specific variations of the MCCB, these breakers combine the short-circuit and isolation functionality of the MCCB with the motor overcurrent protection of a traditional overload relay. MPCBs are UL 489 Listed as circuit breakers and verified… Read more
Dec 07, 2015 | Edvard
Learn How To Specify Current Transformers
Current transformers are used to supply information to the protective relays and/or current, power and energy metering “instruments”. For this purpose they must supply a secondary current proportional to the primary current flowing through them… Read more
Dec 05, 2015 | Edvard
7 guidelines to select correctly rated circuit breaker
The general procedure for the selection of correctly rated circuit breaker follows the following scheme of seven major questions you should answer. Let’s see the major questions: What is the task of the branch circuit… Read more
Dec 04, 2015 | Edvard
The Mesh Current Method For Analysis Of Electric Circuits
The mesh current method of circuit analysis discussed in this technical article employs mesh currents as the independent variables. The idea is to write the appropriate number of independent equations, using mesh currents as the… Read more
Nov 25, 2015 | Edvard
Automatic transfer system explained in details (operational requirements)
In previous article I explained the role of the automatic transfer system and the operational requirements – three modes of operation: manual mode, automatic mode and auto mode failure. Now let’s cover the following topics and try… Read more
Nov 21, 2015 | Edvard
Automatic Transfer System (ATS) Explained in Details
Using the basic building blocks of utility power, system topology, on-site generation, and uninterruptible power supplies, the basic role of the automatic transfer system may now be defined. In this role, the Automatic Transfer System… Read more
Nov 20, 2015 | Edvard
Example On How To Design a Low Voltage Switchboard
This technical article has the aim of helping the panel builder and the designer in the construction of ABB SACE ArTu low voltage switchboard. To this purpose, starting from the single-line diagram of a plant,… Read more
Nov 18, 2015 | Edvard
Primary distribution schemes of power plants on board of big ships
The MV primary distribution network generally consists in a three-phase system with three conductors without neutral. Such system is usually managed with the neutral of the star point isolated from earth or connected with earth… Read more
Nov 16, 2015 | Edvard
The Tesla Electric Light Company in Electrical Review, August 14, 1886
Electrical Review, August 14, 1886 – A weekly journal of electric light, telephone telegraph and scientific progress This company has been organized nearly two years, and has devoted that tittle, to perfecting a complete arc-light… Read more
Nov 14, 2015 | Edvard
Single-line diagram of the AC transmission and distribution system
The conductor system by means of which electric power is conveyed from a generating station to the consumer’s premises may, in general, be divided into two distinct parts i.e. transmission system and distribution system. Each… Read more
Nov 13, 2015 | Edvard
Connection Schemes For Testing Insulation Resistance Of Electrical Equipment
The following schemes show how to connect a Megger insulation tester to various types of electrical equipment. The schemes also show in principle how equipment must be disconnected from other circuits before the instrument is connected. These illustrations… Read more
Nov 11, 2015 | Edvard
LV/MV Distribution In Power Plants On Board Of Big Ships
Without going into the details of the management modalities of the electric distribution or of the layout that an electrical system on board may have, it is possible to describe it in short, however giving… Read more
Nov 09, 2015 | Edvard
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 the more pertinent ones are… Read more
Nov 07, 2015 | Edvard
