ABB’s Electrical installation handbooks


ABB’s Electrical installation handbooks



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ABB’s Electrical installation handbooks



Scope and objectives

The scope of this electrical installation handbook is to provide the designer and user of electrical plants with a quick reference, immediate-use working tool.

This is not intended to be a theoretical document, nor a technical catalogue, but, in addition to the latter, aims to be of help in the correct definition of equipment, in numerous practical installation situations.

The dimensioning of an electrical plant requires knowledge of different factors relating to, for example, installation utilities, the electrical conductors and other components; this knowledge leads the design engineer to consult numerous documents and technical catalogues. This electrical installation handbook, however, aims to supply, in a single document, tables for the quick definition of the main parameters of the components of an electrical plant and for the selection of the protection devices for a wide range of installations. Some application examples are included to aid comprehension of the selection tables.


Electrical installation handbook users

The electrical installation handbook is a tool which is suitable for all those who are interested in electrical plants: useful for installers and maintenance technicians through brief yet important electrotechnical references, and for sales engineers through quick reference selection tables.


Validity of the electrical installation handbook

Some tables show approximate values due to the generalization of the selection process, for example those regarding the constructional characteristics of electrical machinery. In every case, where possible, correction factors are given for actual conditions which may differ from the assumed ones. The tables are always drawn up conservatively, in favour of safety; for more accurate calculations, the use of DOCWin software is recommended for the dimensioning of electrical installations.



ABB’s Technical Guide No. 1: Direct Torque Control

General

Direct Torque Control - or DTC - is the most advanced AC drive technology developed by any manufacturer in the world.


This manual’s purpose

The purpose of this Technical Guide is to explain what DTC is; why and how it has evolved; the basic theory behind its success; and the features and benefits of this new technology.

While trying to be as practical as possible, this guide does require a basic understanding of AC motor control principles.

It is aimed at decision makers including designers, specifiers, purchasing managers, OEMs and end-users; in all markets such as the water, chemical, pulp and paper, power generation,material handling, air conditioning and other industries.

In fact, anyone using variable speed drives (VSD) and who would like to benefit from VSD technology will find this Technical Guide essential reading.


Using this guide

This guide has been designed to give a logical build up as to why and how DTC was developed.

Readers wanting to know the evolution of drives from early DC techniques through AC to DTC should start at Chapter 2 (page 6).

For those readers wanting answers about DTC’s performance, operation and application potential, please go straight to Chapter 3 (page 15) Questions & Answers.

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