IEC TR 61000-3-6-2008 PDF

Full title and description

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. This Technical Report provides guidance to system operators, owners and engineers on principles for determining requirements and assessing emission limits for installations that produce harmonics and interharmonics when connected to medium-, high- and extra-high-voltage public power systems.

Abstract

This informative Technical Report (second edition, 2008) describes methods to assess harmonic and interharmonic emissions from distorting installations, and offers guidance on co-ordinating harmonic voltages across different voltage levels to maintain adequate supply quality for all customers. It clarifies that LV installations are covered elsewhere, excludes detailed treatment of communications-circuit interference, and is intended to complement equipment emission standards rather than replace them.

General information

• Status: Published Technical Report (informative/basic EMC publication).
• Publication date: 22 February 2008.
• Publisher: International Electrotechnical Commission (IEC).
• ICS / categories: 33.100.10 (Electromagnetic compatibility - EMC).
• Edition / version: 2nd edition (2008).
• Number of pages: 58 pages (PDF).

Scope

The report gives guidance on principles and engineering practices for determining connection requirements of distorting installations (loads or generators producing harmonics and/or interharmonics) to public medium-voltage (MV), high-voltage (HV) and extra-high-voltage (EHV) systems. It focuses on coordination of harmonic voltages between voltage levels to meet compatibility levels at the point of utilisation and does not address LV installations or detailed interference to communication circuits. The document is informative and intended to assist system operators and owners in preserving service quality.

Key topics and requirements

• Definitions and characterization of distorting installations (harmonics and interharmonics).
• Assessment methods for harmonic currents injected into MV/HV/EHV systems and resulting harmonic voltages.
• Principles for coordination of harmonic compatibility levels between different voltage levels.
• Engineering guidance for system operators on connection requirements and mitigation practices.
• Considerations of network impedance, resonance, and aggregation of multiple sources.
• Guidance to complement, not replace, equipment emission limits given in product standards.

Typical use and users

Used by transmission and distribution system operators, grid planners, utility engineers, consultants, manufacturers of large converters and generators, regulators, and standards developers to assess connection requests, set technical connection conditions, perform network impact studies, and coordinate emission compatibility between voltage levels.

Related standards

Part of the IEC 61000 series on EMC. Commonly referenced standards and reports include IEC 61000-3-2 (harmonic current emissions for equipment), IEC 61000-3-3 (voltage changes and flicker), IEC/TR 61000-3-7, IEC/TR 61000-3-13, and the IEC 61000-4 series (measurement methods such as 4-7, 4-13 and 4-30). National or regional variants and application guides for connection rules and grid codes are often used in conjunction with this TR.

Keywords

EMC, harmonics, interharmonics, distorting installation, MV, HV, EHV, network impedance, emission limits, compatibility levels, power quality, IEC TR 61000-3-6:2008.

FAQ

Q: What is this standard?

A: It is IEC TR 61000-3-6:2008, a Technical Report providing guidance on assessment of emission limits for connecting distorting installations to MV, HV and EHV power systems; it is an informative/basic EMC publication rather than a prescriptive product standard.

Q: What does it cover?

A: It covers assessment methods and engineering guidance for harmonic and interharmonic emissions from distorting installations, coordination of harmonic voltages across voltage levels, and recommended practices for system operators to help ensure adequate service quality. It does not replace equipment emission standards and does not address LV connection rules or communication-circuit interference in this edition.

Q: Who typically uses it?

A: Transmission/distribution system operators, utility planners, consultants, manufacturers of large converters and generators, regulators and standards writers use it for connection assessments, network impact studies and to inform grid connection requirements.

Q: Is it current or superseded?

A: This entry refers to the second edition published in February 2008. Users should verify whether a newer edition or related guidance has been published by IEC or adopted regionally; the IEC webstore lists the 2008 edition as the 2nd edition (stability date indicated for reference).

Q: Is it part of a series?

A: Yes — it is part of the IEC 61000 series (EMC), specifically the Part 3 family relating to limits and assessment of emissions and power-quality related phenomena; it is commonly used together with other IEC 61000 parts and TRs that address measurement and product-specific emission limits.

Q: What are the key keywords?

A: EMC, harmonics, interharmonics, distorting installation, power quality, MV/HV/EHV, emission limits, compatibility levels, network impedance.