• IEC TR 61000-3-13:2008

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    Electromagnetic compatibility (EMC) - Part 3-13: Limits - Assessment of emission limits for the connection of unbalanced installations to MV, HV and EHV power systems

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    Published date:  22-02-2008

    Publisher:  International Electrotechnical Committee

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    Abstract - (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 unbalanced installations (i.e. three-phase installations causing voltage unbalance) to MV, HV and EHV public power systems (LV installations are covered in other IEC documents). For the purposes of this report, an unbalanced installation means a three-phase installation (which may be a load or a generator) that produces voltage unbalance on the system. The connection of single-phase installations is not specifically addressed, as the connection of such installations is under the control of the system operator or owner. The general principles however may be adapted when considering the connection of single-phase installations. 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. The 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 unbalanced load situations. The recommended approach should be used with flexibility and 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 installations which may cause unbalance on the system. The disturbing installation is to be understood as the complete customer's installation (i.e. including balanced and unbalanced parts). Problems related to unbalance fall into two basic categories.



    - Unbalanced installations that draw negative-sequence currents which produce negative-sequence voltages on the supply system. Examples of such installations include arc furnaces and traction loads (typically connected to the public network at HV), and three phase installations where the individual loads are not balanced (typically connected at MV and LV). Negative-sequence voltage superimposed onto the terminal voltage of rotating machines can produce additional heat losses. Negative-sequence voltage can also cause non-characteristic harmonics (typically positive-sequence 3rd harmonic) to be produced by power converters.



    - Unbalanced installations connected line-to-neutral can also draw zero-sequence currents which can be transferred or not into the supply system depending on the type of connection of the coupling transformer. The flow of zero-sequence currents in a grounded neutral system causes zero-sequence unbalance affecting line-to-neutral voltages. This is not normally controlled by setting emission limits, but rather by system design and maintenance. Ungrounded-neutral systems and phase-to-phase connected installations are not, however, affected by this kind of voltage unbalance. This report gives guidance only for the coordination of the negative-sequence type of voltage unbalance between different voltage levels in order to meet the compatibility levels at the point of utilisation. No compatibility levels are defined for zero-sequence type of voltage unbalance as this is often considered as being less relevant to the coordination of unbalance levels compared to the first type of voltage unbalance. However, for situations where a non-zero impedance exists between neutral and earth with the system still being effectively grounded (i.e., where the ratio between zero-sequence, X0 and positive sequence reactance X1 is 0 < X0/X1 = 3), this type of voltage unbalance can be of concern especially when the type of connection of the coupling transformer allows zero-sequence path to flow from MV to LV and vice-versa. This Technical Report has the status of a basic EMC publication in accordance with IEC Guide 107. The contents of the corrigendum of April 2010 have been included in this copy.

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

    Committee TC 77/SC 77A
    Development Note Stability Date: 2018. (09/2017)
    Document Type Technical Report
    Publisher International Electrotechnical Committee
    Status Current

    Standards Referenced By This Book - (Show below) - (Hide below)

    EN 61000-4-30:2015/AC:2017-01 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 4-30: TESTING AND MEASUREMENT TECHNIQUES - POWER QUALITY MEASUREMENT METHODS (IEC 61000-4-30:2015/COR1:2016)
    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
    BS PD 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
    UNE-EN 61000-4-30:2015 Electromagnetic compatibility (EMC) - Part 4-30: Testing and measurement techniques - Power quality measurement methods
    BS EN 61000-4-30:2015 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 4-30: TESTING AND MEASUREMENT TECHNIQUES - POWER QUALITY MEASUREMENT METHODS (IEC 61000-4-30:2015)
    CSA C61000.3.7 :2009 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 3-7: LIMITS - ASSESSMENT OF EMISSION LIMITS FOR THE CONNECTION OF FLUCTUATING INSTALLATIONS TO MV, HV AND EHV POWER SYSTEMS
    I.S. EN 61000-4-30:2015 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 4-30: TESTING AND MEASUREMENT TECHNIQUES - POWER QUALITY MEASUREMENT METHODS
    CSA C61000-3-14 : 2015 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 3-14: ASSESSMENT OF EMISSION LIMITS FOR HARMONICS, INTERHARMONICS, VOLTAGE FLUCTUATIONS AND UNBALANCE FOR THE CONNECTION OF DISTURBING INSTALLATIONS TO LV POWER SYSTEMS
    IEEE 1453.1 : 2012 GUIDE - ADOPTION OF IEC/TR 61000-3-7:2008, ELECTROMAGNETIC COMPATIBILITY (EMC) - LIMITS - ASSESSMENT OF EMISSION LIMITS FOR THE CONNECTION OF FLUCTUATING INSTALLATIONS TO MV, HV AND EHV POWER SYSTEMS
    PD IEC/TR 61850-90-17:2017 Communication networks and systems for power utility automation Using IEC 61850 to transmit power quality data
    S.R. CLC/TS 50549-2:2015 REQUIREMENTS FOR GENERATING PLANTS TO BE CONNECTED IN PARALLEL WITH DISTRIBUTION NETWORKS - PART 2: CONNECTION TO A MV DISTRIBUTION NETWORK
    IEC TR 61000-3-7:2008 Electromagnetic compatibility (EMC) - Part 3-7: Limits - Assessment of emission limits for the connection of fluctuating installations to MV, HV and EHV power systems
    17/30354643 DC : 0 BS EN 62933-2-1 - ELECTRIC ENERGY STORAGE (ESS) SYSTEMS - PART 2-1: UNIT PARAMETERS AND TESTING METHODS - GENERAL SPECIFICATION
    CSA C61000-4-30 : 2010 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 4-30: TESTING AND MEASUREMENT TECHNIQUES - POWER QUALITY MEASUREMENT METHODS
    CSA C61000.3.6 : 2009 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 3-6: LIMITS - ASSESSMENT OF EMISSION LIMITS FOR THE CONNECTION OF DISTORTING INSTALLATIONS TO MV, HV AND EHV POWER SYSTEMS
    CSA C61000.3.6 : 2009 : R2014 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 3-6: LIMITS - ASSESSMENT OF EMISSION LIMITS FOR THE CONNECTION OF DISTORTING INSTALLATIONS TO MV, HV AND EHV POWER SYSTEMS
    EN IEC 62933-2-1 : 2018 ELECTRICAL ENERGY STORAGE (EES) SYSTEMS - PART 2-1: UNIT PARAMETERS AND TESTING METHODS - GENERAL SPECIFICATION (IEC 62933-2-1:2017)
    I.S. EN IEC 62933-2-1:2018 ELECTRICAL ENERGY STORAGE (EES) SYSTEMS - PART 2-1: UNIT PARAMETERS AND TESTING METHODS - GENERAL SPECIFICATION
    IEC 62933-2-1:2017 Electrical energy storage (EES) systems - Part 2-1: Unit parameters and testing methods - General specification
    PD IEC/TR 61000-3-14:2011 (published 2011-11) Electromagnetic compatibility (EMC) Assessment of emission limits for harmonics, interharmonics, voltage fluctuations and unbalance for the connection of disturbing installations to LV power systems
    CLC/TS 50549-2:2015 REQUIREMENTS FOR GENERATING PLANTS TO BE CONNECTED IN PARALLEL WITH DISTRIBUTION NETWORKS - PART 2: CONNECTION TO A MV DISTRIBUTION NETWORK
    IEC TR 61850-90-17:2017 Communication networks and systems for power utility automation - Part 90-17: Using IEC 61850 to transmit power quality data
    IEC TS 62749:2015 Assessment of power quality - Characteristics of electricity supplied by public networks
    IEC TR 61000-3-14:2011 Electromagnetic compatibility (EMC) - Part 3-14: Assessment of emission limits for harmonics, interharmonics, voltage fluctuations and unbalance for the connection of disturbing installations to LV power systems
    IEC 61000-4-30 : 3.0EN+(REDLINE+VERSION) ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 4-30: TESTING AND MEASUREMENT TECHNIQUES - POWER QUALITY MEASUREMENT METHODS
    IEC 61000-4-30:2015 RLV Electromagnetic compatibility (EMC) - Part 4-30: Testing and measurement techniques - Power quality measurement methods
    CSA C61000-3-14:15 (R2019) Electromagnetic compatibility (EMC) — Part 3-14: Assessment of emission limits for harmonics, interharmonics, voltage fluctuations and unbalance for the connection of disturbing installations to LV power systems (Adopted IEC/TR 61000-3-14:2011, first edition, 2011-10, with Canadian deviations)
    CSA C61000.3.7 : 2009 : R2017 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 3-7: LIMITS - ASSESSMENT OF EMISSION LIMITS FOR THE CONNECTION OF FLUCTUATING INSTALLATIONS TO MV, HV AND EHV POWER SYSTEMS
    CSA C61000.3.7 : 2009 : R2014 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 3-7: LIMITS - ASSESSMENT OF EMISSION LIMITS FOR THE CONNECTION OF FLUCTUATING INSTALLATIONS TO MV, HV AND EHV POWER SYSTEMS
    PD IEC/TR 61000-3-7:2008 Electromagnetic compatability (EMC) Limits. Assessment of emission limits for the connection of fluctuating installations to MV, HV and EHV power systems
    CSA C61000-4-30 : 2010 : R2014 ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 4-30: TESTING AND MEASUREMENT TECHNIQUES - POWER QUALITY MEASUREMENT METHODS

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

    IEC 61000-4-30 : 3.0EN+(REDLINE+VERSION) ELECTROMAGNETIC COMPATIBILITY (EMC) - PART 4-30: TESTING AND MEASUREMENT TECHNIQUES - POWER QUALITY MEASUREMENT METHODS
    IEC GUIDE 107:2014 Electromagnetic compatibility - Guide to the drafting of electromagnetic compatibility publications
    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 60050-101:1998 International Electrotechnical Vocabulary (IEV) - Part 101: Mathematics
    IEC TR 61000-3-7:2008 Electromagnetic compatibility (EMC) - Part 3-7: Limits - Assessment of emission limits for the connection of fluctuating installations to MV, HV and EHV power systems
    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 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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