AS 2279.2-1991

1 - AS 2279.2-1991 DISTURBANCES IN MAINS SUPPLY NETWORKS - LIMITATION OF HARMONICS CAUSED BY INDUSTRIAL EQUIPMENT
4 - PREFACE
4 - CONTENTS
5 - FOREWORD
6 - 1 SCOPE
6 - 2 REFERENCED DOCUMENTS
6 - 3 GENERAL
6 - 3.1 Guidance
6 - 3.2 Supply authority right of approval
6 - 4 DEFINITIONS
6 - 4.1 Point of common coupling (PCC)
6 - 4.2 Harmonics
6 - 4.3 Harmonic distortion
7 - 4.4 Harmonic order (n)
7 - 4.5 Triplen harmonics
7 - 4.6 Harmonic voltage ratio
7 - 4.7 Harmonic current ratio
7 - 4.8 Total harmonic voltage distortion
7 - 4.9 Background distortion
7 - 4.10 Total harmonic current distortion
7 - 4.11 Convertor equipment (or convertor)
7 - 4.12 Rectifier equipment
7 - 4.13 Line commutated equipment
7 - 4.14 Thyristor a.c. power controller (a.c. regulator)
7 - 4.15 Pulse number (p)
7 - 4.16 Commutation
7 - 4.17 Commutation voltages (commutation electromotive force)
7 - 4.18 Phase control
7 - 4.19 Overlap (angle)
7 - 4.20 Delay angle
7 - 4.21 Notching
7 - 4.22 Transmission systems
7 - 4.23 Sub-transmission system
8 - 4.24 Primary distribution system
8 - 4.25 Secondary distribution system
8 - 5 HARMONIC LIMITS
8 - 5.1 General
8 - 5.2 Stage 1 limits
9 - 5.3 Stage 2 limits
9 - 5.4 Stage 3 Limits
10 - 6 EFFECTIVE HARMONIC VOLTAGE DISTORTION
10 - 6.1 General
10 - 6.2 Addition of harmonics
11 - 6.3 Short-duration harmonics
11 - 6.4 Voltage notching
11 - 7 IMPLEMENTATION OF PART 2
11 - 7.1 Flow diagrams
11 - 7.2 Required information
13 - 7.3 Commissioning of equipment
16 - APPENDIX A - HARMONIC VOLTAGE DISTORTION
16 - A1 RELATIONSHIP FOR CONVERTING HARMONIC CURRENT INTO LOAD AND VOLTAGE DISTORTION
16 - A2 GUIDE TO MAXIMUM SIZE OF STAGE 2 CONVERTOR INSTALLATION
17 - A3 MEASUREMENT

Gives guidance on the harmonic interference to power supply networks produced by industrial equipment.

Part 2 of this Standard provides guidance on the maximum size of harmonic producing industrial equipment that may be supplied from high or low voltage electricity supply systems and on the limits, of harmonic voltage distortion resulting at the point of common coupling, appropriate to the equipment.Part 2 of this Standard is applicable to all electrical equipment other than that covered by Part 1. In particular, Part 2 is intended for application where one or more of the following conditions apply:(a) The equipment is intended for industrial, professional or commercial purposes.(b) Consent from a supply authority is required before the equipment can be connected to the supply system.(c) The voltage at the point of common coupling (see Clause 4.1) is greater than 240/415 V.(d) Appliances are rated above 4.8 kV.A.

First published as AS 2279.2-1979.
Second edition 1991.