• PD IEC/TR 61000-3-7:2008

    Current The latest, up-to-date edition.

    Electromagnetic compatability (EMC) Limits. Assessment of emission limits for the connection of fluctuating installations to MV, HV and EHV power systems

    Available format(s):  Hardcopy, PDF

    Language(s):  English

    Published date:  30-04-2008

    Publisher:  British Standards Institution

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    Table of Contents - (Show below) - (Hide below)

    INTRODUCTION
    ACKNOWLEDGMENT
    1 Scope
    2 Normative references
    3 Terms and definitions
    4 Basic EMC concepts related to voltage fluctuations
       4.1 Compatibility levels
       4.2 Planning levels
            4.2.1 Indicative values of planning levels
            4.2.2 Assessment procedure for evaluation against
                  planning levels
       4.3 Illustration of EMC concepts
       4.4 Emission levels
    5 General principles
       5.1 Stage 1: simplified evaluation of disturbance
            emission
       5.2 Stage 2: emission limits relative to actual system
            characteristics
       5.3 Stage 3: acceptance of higher emission levels on
            a conditional basis
       5.4 Responsibilities
    6 General guidelines for the assessment of emission levels
       6.1 Point of evaluation
       6.2 Definition of flicker emission level
       6.3 Assessment of flicker emission levels
       6.4 Declared system short circuit power or impedance
            6.4.1 Short-circuit power or impedance for
                  pre-connection assessment of emission
                  levels
            6.4.2 Short-circuit power or impedance for assessing
                  actual emission levels
       6.5 General guidelines for assessing the declared system
            impedance
    7 General summation law
    8 Emission limits for fluctuating installations connected
       to MV systems
       8.1 Stage 1: simplified evaluation of disturbance
            emission
       8.2 Stage 2: emission limits relative to actual system
            characteristics
            8.2.1 Global emission to be shared between the
                  customers
            8.2.2 Individual emission limits
       8.3 Stage 3: acceptance of higher emission levels on
            a conditional basis
       8.4 Summary diagram of the evaluation procedure
    9 Emission limits for fluctuating installations connected
       to HV or EHV systems
       9.1 Stage 1: simplified evaluation of disturbance emission
       9.2 Stage 2: emission limits relative to actual system
            characteristics
            9.2.1 Assessment of the total available power
            9.2.2 Individual emission limits
       9.3 Stage 3: acceptance of higher emission levels on
            a conditional basis
    10 Rapid voltage changes
       10.1 General considerations
       10.2 Compatibility level
       10.3 Planning levels
       10.4 Emission limits
       10.5 Assessment procedure for evaluation against
            planning levels & emission limits
    Annex A (informative) P[st] = 1 curves and numerical data
            for 230 V and 120 V applications
    Annex B (informative) Guidelines on the assessment of
            flicker transfer coefficient
    Annex C (informative) Example of reallocation of global
            contributions and planning levels considering
            transfer coefficients
    Annex D (informative) The use of the severity indicators
            A[st] and A[lt] to simplify calculations
    Annex E (informative) Pre-connection and post-connection
            assessment of emission for P[st]
    Annex F (informative) Addition of P[st] from different
            busbars
    Annex G (informative) Examples of case studies
    Annex H (informative) List of symbols and subscripts
    Bibliography

    Abstract - (Show below) - (Hide below)

    Gives guidance on principles, which can be used as the basis for determining the requirements for the connection of fluctuating installations to MV, HV and EHV public power systems (LV installations are covered in other IEC documents).

    Scope - (Show below) - (Hide below)

    This part of IEC 61000 provides guidance on principles which can be used as the basis for determining the requirements for the connection of fluctuating installations to MV, HV and EHV public power systems (LV installations are covered in other IEC documents). For the purposes of this report, a fluctuating installation means an installation (which may be a load or a generator) that produces voltage flicker and / or rapid voltage changes. The primary objective is to provide guidance to system operators or owners on engineering practices which will facilitate the provision of adequate service quality for all connected customers. In addressing installations, this document is not intended to replace equipment standards for emission limits. This report addresses the allocation of the capacity of the system to absorb disturbances. It does not address how to mitigate disturbances, nor does it address how the capacity of the system can be increased. Since the guidelines outlined in this report are necessarily based on certain simplifying assumptions, there is no guarantee that this approach will always provide the optimum solution for all flicker situations. The recommended approach should be used with flexibility and engineering judgment as far as engineering is concerned, when applying the given assessment procedures in full or in part. The system operator or owner is responsible for specifying requirements for the connection of fluctuating installations to the system. The fluctuating installation is to be understood as the customer\'s complete installation (i.e. including fluctuating and non fluctuating parts). Problems related to voltage fluctuations fall into two basic categories:
    - Flicker effect from light sources as a result of voltage fluctuations;
    - Rapid voltage changes even within the normal operational voltage tolerances are considered as a disturbing phenomenon.
    The report gives guidance for the coordination of the flicker emissions between different voltage levels in order to meet the compatibility levels at the point of utilisation. This report primarily focuses on controlling or limiting flicker, but a clause is included to address the limitation of rapid voltage changes. This second edition cancels and replaces the first edition published in 1996 and constitutes a technical revision. This new edition is significantly more streamlined than the original technical report (Edition 1), and reflects the experiences gained in the application of the first edition. This technical report has also been harmonised with IEC/TR 61000-3-6 and IEC/TR 61000-3-13. This Technical Report has the status of a basic EMC publication in accordance with IEC Guide 107.

    General Product Information - (Show below) - (Hide below)

    Committee GEL/210
    Development Note Supersedes BS IEC 1000-3.7 & 06/30150181 DC. (04/2008)
    Document Type Standard
    Publisher British Standards Institution
    Status Current
    Supersedes

    Standards Referencing This Book - (Show below) - (Hide below)

    IEC TR 61000-2-6:1995 Electromagnetic compatibility (EMC) - Part 2: Environment - Section 6: Assessment of the emission levels in the power supply of industrial plants as regards low-frequency conducted disturbances
    IEC 61000-4-30 : 3.0EN+(REDLINE+VERSION) ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 4-30: TESTING AND MEASUREMENT TECHNIQUES - POWER QUALITY MEASUREMENT METHODS
    IEC 61000-4-15 : 2.0 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 4-15: TESTING AND MEASUREMENT TECHNIQUES - FLICKERMETER - FUNCTIONAL AND DESIGN SPECIFICATIONS
    IEC GUIDE 107:2014 Electromagnetic compatibility - Guide to the drafting of electromagnetic compatibility publications
    IEC 61000-3-11 : 2.0 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 3-11: LIMITS - LIMITATION OF VOLTAGE CHANGES, VOLTAGE FLUCTUATIONS AND FLICKER IN PUBLIC LOW-VOLTAGE SUPPLY SYSTEMS - EQUIPMENT WITH RATED CURRENT <= 75 A AND SUBJECT TO CONDITIONAL CONNECTION
    IEC 61000-2-12:2003 Electromagnetic compatibility (EMC) - Part 2-12: Environment - Compatibility levels for low-frequency conducted disturbances and signalling in public medium-voltage power supply systems
    IEC 60050-601:1985 International Electrotechnical Vocabulary (IEV) - Part 601: Generation, transmission and distribution of electricity - General
    IEC TR 61000-3-13:2008 Electromagnetic compatibility (EMC) - Part 3-13: Limits - Assessment of emission limits for the connection of unbalanced installations to MV, HV and EHV power systems
    IEC 60909-0:2016 Short-circuit currents in three-phase a.c. systems - Part 0: Calculation of currents
    IEC 61000-4-15:2010 Electromagnetic compatibility (EMC) - Part 4-15: Testing and measurement techniques - Flickermeter - Functional and design specifications
    IEC TR 61000-2-1:1990 Electromagnetic compatibility (EMC) - Part 2: Environment - Section 1: Description of the environment - Electromagnetic environment for low-frequency conducted disturbances and signalling in public power supply systems
    IEC 61000-2-2:2002+AMD1:2017 CSV Electromagnetic compatibility (EMC) - Part 2-2: Environment - Compatibility levels for low-frequency conducted disturbances and signalling in public low-voltage power supply systems
    IEC 61000-3-3:2013 RLV Electromagnetic compatibility (EMC) - Part 3-3: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤ 16 A per phase and not subject to conditional connection
    IEC 61000-3-3 : 3.0EN+(REDLINE+VERSION) ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 3-3: LIMITS - LIMITATION OF VOLTAGE CHANGES, VOLTAGE FLUCTUATIONS AND FLICKER IN PUBLIC LOW-VOLTAGE SUPPLY SYSTEMS, FOR EQUIPMENT WITH RATED CURRENT <= 16 A PER PHASE AND NOT SUBJECT TO CONDITIONAL CONNECTION
    IEC TR 61000-3-6:2008 Electromagnetic compatibility (EMC) - Part 3-6: Limits - Assessment of emission limits for the connection of distorting installations to MV, HV and EHV power systems
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