ABB’s Electrical installation handbooks
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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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