AS/NZS 61000.2.12:2003

1 - AS/NZS 61000.2.12:2003 ELECTROMAGNETIC COMPATIBILITY(EMC) - ENVIRONMENT-COMPATIBILITY LEVELS FOR LOW-FREQUENCY CONDUCTED...
4 - PREFACE
6 - CONTENTS
7 - 1 Scope and object
8 - 2 Normative references
8 - 3 Terms and definitions
8 - 3.1 General definitions
8 - 3.1.1 (electromagnetic) disturbance
8 - 3.1.2 disturbance level
9 - 3.1.3 electromagnetic compatibility
9 - 3.1.4 (electromagnetic) compatibility level
9 - 3.1.5 planning level
9 - 3.1.6 point of common coupling PCC
9 - 3.2 Phenomena related definitions
10 - 3.2.1 fundamental frequency
10 - 3.2.2 fundamental component
10 - 3.2.3 harmonic frequency
10 - 3.2.4 harmonic component
10 - 3.2.5 interharmonic frequency
10 - 3.2.6 interharmonic component
11 - 3.2.7 total harmonic distortion THD
11 - 3.2.8 voltage unbalance (imbalance)
11 - 4 Compatibility levels
11 - 4.1 General comment
12 - 4.2 Voltage fluctuations and flicker
12 - 4.3 Harmonics
13 - 4.4 Interharmonics and voltage components at frequencies above that of the 50 th harmonic
13 - 4.5 Voltage dips and short supply interruptions
14 - 4.6 Voltage unbalance
14 - 4.7 Transient overvoltages
14 - 4.8 Temporary power frequency variation
14 - 4.9 DC component
14 - 4.10 Mains signalling
15 - 4.10.1 Ripple control systems (110 Hz to 3 000 Hz)
16 - 4.10.2 Medium-frequency power-line carrier systems (3 kHz to 20 kHz)
16 - 4.10.3 Radio-frequency power-line carrier systems (20 kHz to 148,5 kHz)
16 - 4.10.4 Mains-mark systems
17 - Annex A - The function of compatibility levels and planning levels in EMC
17 - A.1 The need for compatibility levels
17 - A.2 Relation between compatibility level and immunity levels
18 - A.3 Relation between compatibility level and emission limits
19 - A.4 Planning levels
20 - A.5 Illustration of compatibility, emission, immunity and planning levels
21 - Annex B - Discussion of some disturbance phenomena
21 - B.1 Resolution of non-sinusoidal voltages and currents
23 - B.2 Interharmonics and voltage components at frequencies above that of the 50th harmonic
25 - B.3 Voltage dips and short supply interruptions
26 - B.4 Transient overvoltages
26 - B.5 DC component
28 - Bibliography

Specifies compatibility levels for low-frequency conducted disturbances and signalling in public medium-voltage power supply systems. This Standard is identical with and has been reproduced from IEC 61000-2-12:2003.

This part of AS/NZS 61000 is concerned with conducted disturbances in the frequency rangefrom 0 kHz to 9 kHz, with an extension up to 148,5 kHz specifically for mains signallingsystems. It gives compatibility levels for public medium voltage a.c. distribution systemshaving a nominal voltage between 1 kV and 35 kV and a nominal frequency of 50 Hz or 60 Hz(see IEC 60038).Compatibility levels are specified for electromagnetic disturbances of the types which can be expected in public medium voltage power supply systems, for guidance in:a) the limits to be set for disturbance emission into public power supply systems (includingthe planning levels defined in 3.1.5);b) the immunity limits to be set by product committees and others for the equipmentexposed to the conducted disturbances present in public power supply systems.The disturbance phenomena considered are:• voltage fluctuations and flicker;• harmonics up to and including order 50;• inter-harmonics up to the 50 th harmonic;• voltage distortions at higher frequencies (above 50 th harmonic);• voltage dips and short supply interruptions;• voltage unbalance;• transient overvoltages;• power frequency variation;• d.c. components;• mains signalling.Most of these phenomena are described in IEC 61000-2-1. In cases where it is not yetpossible to establish compatibility levels, some information is provided.The medium-voltage systems covered by this standard are public distribution systemssupplying either:a) private installations in which equipment is connected directly or through transformers, orb) substations feeding public low-voltage distribution systems.The compatibility levels specified in this standard apply at the point of common coupling in the case of (a) and at the medium-voltage terminals of the substation in the case of (b). See Clause 4.

First published as AS/NZS 61000.2.12:2003.