ABB-Electrical Installation Handbook-Vol.1-Protection and Control Devices-2 ed.pdf

Protection and

control devices

Electrical installation handbook

Volume 1

2 nd edition

1SDC008001D0202

ABB SACE

Electrical installation handbook

Volume 1

Protection and control devices

2 nd edition

February 2004

First edition 2003

Second edition 2004

Published by ABB SACE

via Baioni, 35 - 24123 Bergamo (Italy)

Index

Introduction .............................................................................................. 2

1 Standards

1.1 General aspects .............................................................................. 3

1.2 IEC Standards for electrical installation .......................................... 15

2 Protection and control devices

2.1 Circuit-breaker nameplates ........................................................... 22

2.2 Main definitions ............................................................................. 25

2.3 Types of releases .......................................................................... 28

3 General characteristics

3.1 Electrical characteristics of circuit breakers ................................... 38

3.2 Trip curves .................................................................................... 49

3.3 Limitation curves ......................................................................... 107

3.4 Specific let-through energy curves .............................................. 134

3.5 Temperature derating .................................................................. 160

3.6 Altitude derating .......................................................................... 175

3.7 Electrical characteristics of switch disconnectors ........................ 176

4 Protection coordination

4.1 Protection coordination ............................................................... 182

4.2 Discrimination tables ................................................................... 189

4.3 Back-up tables ........................................................................... 214

4.4 Coordination tables between circuit breakers and

switch disconnectors .................................................................. 218

5 Special applications

5.1 Direct current networks ............................................................... 222

5.2 Networks at particular frequencies; 400 Hz and 16 2/3 Hz .......... 233

5.3 1000 Vdc and 1000 Vac networks .............................................. 250

5.4 Automatic Transfer Switches ....................................................... 262

6 Switchboards

6.1 Electrical switchboards ............................................................... 271

6.2 MNS switchboards ..................................................................... 279

6.3 ArTu distribution switchboards .................................................... 280

Annex A: Protection against short-circuit effects inside

low-voltage switchboards .................................................. 283

Annex B: Temperature rise evaluation

according to IEC 60890 ....................................................... 292

ABB SACE - Protection and control devices

Introduction

1 Standards

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.

1.1 General aspects

In each technical field, and in particular in the electrical sector, a condition

sufficient (even if not necessary) for the realization of plants according to the

“status of the art” and a requirement essential to properly meet the demands

of customers and of the community, is the respect of all the relevant laws and

technical standards.

Therefore, a precise knowledge of the standards is the fundamental premise

for a correct approach to the problems of the electrical plants which shall be

designed in order to guarantee that “acceptable safety level” which is never

absolute.

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.

Juridical Standards

These are all the standards from which derive rules of behavior for the juridical

persons who are under the sovereignty of that State.

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.

Technical Standards

These standards are the whole of the prescriptions on the basis of which

machines, apparatus, materials and the installations should be designed,

manufactured and tested so that efficiency and function safety are ensured.

The technical standards, published by national and international bodies, are

circumstantially drawn up and can have legal force when this is attributed by a

legislative measure.

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.

Application fields

Electrotechnics and

Mechanics, Ergonomics

Telecommunications

Electronics

and Safety

International Body

IEC

ITU

ISO

European Body

CENELEC ETSI CEN

This technical collection takes into consideration only the bodies dealing with electrical and electronic

technologies.

IEC International Electrotechnical Commission

The International Electrotechnical Commission (IEC) was officially founded in

1906, with the aim of securing the international co-operation as regards

standardization and certification in electrical and electronic technologies. This

association is formed by the International Committees of over 40 countries all

over the world.

The IEC publishes international standards, technical guides and reports which

are the bases or, in any case, a reference of utmost importance for any national

and European standardization activity.

IEC Standards are generally issued in two languages: English and French.

In 1991 the IEC has ratified co-operation agreements with CENELEC (European

standardization body), for a common planning of new standardization activities

and for parallel voting on standard drafts.

ABB SACE - Protection and control devices

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