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The IEC 61936-1:2021 standard, titled "Power installations exceeding 1 kV AC and 1.5 kV DC – Part 1: AC", is a technical revision that establishes safety and design requirements for high-voltage AC electrical power installations. Official Links and Purchase

You can access the standard and its variants via these official and authorized platforms: IEC Webstore: The primary source for the official standard.

IEC Webstore (Commented Version): A version that includes expert comments explaining major changes between the 2010 and 2021 editions.

BSI Knowledge: Provides the British adoption (BS EN IEC 61936-1:2021).

ANSI Webstore: Another commercial source for the British Standard version. Key Updates in the 2021 Edition

The 2021 edition replaces the previous 2010 version with approximately 20 major changes, including:

Restructured Clauses: The section on protection, automation, and auxiliary systems was completely restructured for better clarity.

GIS Requirements: Reintroduced specific requirements for Gas-Insulated Switchgear (GIS).

Improved Safety Guidance: Added new labelling requirements for multiple power sources and an informative guideline (Annex F) for safe working procedures when national regulations are unavailable.

HVAC Improvements: Enhanced requirements for ventilation systems (HVAC) in electrical installations.

Lightning Protection: Extended the protection requirements against lightning strokes.

Editorial Clarity: Updated terms, definitions, and changed "should" to "shall" in many instances to make requirements mandatory rather than advisory. Scope and Applications

The standard applies to systems with nominal voltages exceeding 1 kV AC and frequencies up to 60 Hz.

Includes: Substations, electrical installations on poles/masts, industrial plants, and offshore facilities. iec 6193612021 link

Excludes: Overhead lines between separate installations, electrified railways, mining equipment, and medical equipment. IEC 61936-1:2021 CMV

IEC 61936-1:2021 standard is the definitive global reference for the design and installation of electrical power systems exceeding . This third edition introduced roughly 20 major changes

to modernize safety and technical requirements for high-voltage (HV) infrastructure. Core Scope & Applications

This standard governs the "erection" phase—ensuring that power installations are safely built and fully functional for their intended use. It applies to: Substations and power stations. Outdoor switchgear and industrial electrical systems. Offshore generation and transition poles. Top 5 Critical Updates in the 2021 Edition Safety & Maintenance Distinction : The standard now explicitly distinguishes between the of an installation and subsequent maintenance/repair

activities. Annex F provides crucial informative guidelines for safe working procedures where local regulations are missing. Insulation Coordination (Clause 5)

: This section has been completely updated to align with the latest versions of international insulation standards, providing clearer wording for phase-to-phase and phase-to-earth clearances. Earthing & Touch Voltages : The permissible touch-voltage curves in

have been modified. For CENELEC members, there is now an explicit alignment with for earthing systems. Reintroduction of GIS Requirements : Missing requirements for Gas-Insulated Switchgear (GIS) from previous versions were reintroduced and refined. Protection & Automation (Clause 11)

: This clause was restructured and improved, particularly regarding lightning protection and requirements for labeling when multiple power sources must be disconnected. Design & Safety Quick-Reference IEC 61936-1:2010

Overview

IEC 61936-1:2021 is a standard published by the International Electrotechnical Commission (IEC) that focuses on power installations exceeding 1 kV AC and 1.5 kV DC. The standard provides guidelines for the design, construction, and maintenance of power installations to ensure safety and reliability.

Key aspects reviewed:

Scope and applicability: The standard applies to power installations with voltages exceeding 1 kV AC and 1.5 kV DC, including high-voltage substations, power plants, and transmission and distribution systems.
Safety considerations: The standard emphasizes safety aspects, such as protection against electric shock, thermal and dynamic effects, and prevention of injuries and damage to equipment.
Design and construction: The standard provides guidelines for the design and construction of power installations, including aspects like insulation coordination, overvoltage protection, and electrical measurement and control.
Testing and commissioning: The standard outlines requirements for testing and commissioning of power installations to ensure they meet safety and performance standards.
Maintenance and operation: The standard also provides guidance on maintenance and operation of power installations, including aspects like inspection, testing, and replacement of equipment.

Usefulness and benefits

The IEC 61936-1:2021 standard is useful for: Scope and applicability : The standard applies to

Electrical engineers and designers: The standard provides a comprehensive framework for designing and constructing safe and reliable power installations.
Power plant operators and maintainers: The standard helps ensure that power plants are operated and maintained safely and efficiently.
Utilities and grid operators: The standard supports the reliable and efficient transmission and distribution of electricity.

Criticisms and limitations

Some potential limitations of the standard include:

Complexity: The standard is quite detailed and may be challenging to navigate for those without extensive experience in power installations.
National and regional variations: Some countries or regions may have additional or conflicting regulations that need to be considered.

Overall, the IEC 61936-1:2021 standard is a valuable resource for ensuring the safety and reliability of power installations. Its comprehensive guidelines and recommendations can help electrical engineers, designers, operators, and maintainers design, construct, and maintain power installations that meet the highest safety and performance standards.

Understanding IEC 61936-1:2021 - The Latest Standard for Power Installations

The International Electrotechnical Commission (IEC) is a global organization that develops and publishes standards for electrical and electronic technologies. One of its most recent publications is IEC 61936-1:2021, which focuses on power installations exceeding 1 kV AC and 1.5 kV DC. This standard is crucial for ensuring the safety and efficiency of high-voltage power installations, and in this article, we will explore its significance, contents, and implications for the industry.

What is IEC 61936-1:2021?

IEC 61936-1:2021 is a standard that provides guidelines for the design, construction, and maintenance of power installations that operate at voltages exceeding 1 kV AC and 1.5 kV DC. The standard covers a wide range of applications, including power generation, transmission, and distribution systems, as well as industrial and commercial installations.

Importance of IEC 61936-1:2021

The importance of IEC 61936-1:2021 cannot be overstated. High-voltage power installations can be hazardous if not designed, constructed, and maintained properly. The standard helps to ensure that such installations are safe for workers, the general public, and the environment. By following the guidelines set out in IEC 61936-1:2021, companies and organizations can minimize the risks associated with high-voltage power installations and ensure compliance with regulatory requirements.

Contents of IEC 61936-1:2021

IEC 61936-1:2021 is a comprehensive standard that covers various aspects of power installations. Some of the key topics addressed in the standard include:

Design and planning: The standard provides guidelines for the design and planning of power installations, including the selection of equipment, layout, and safety considerations.
Safety requirements: IEC 61936-1:2021 outlines the safety requirements for power installations, including protection against electric shock, fire, and other hazards.
Electrical equipment: The standard specifies the requirements for electrical equipment used in high-voltage power installations, including transformers, switchgear, and cables.
Testing and commissioning: IEC 61936-1:2021 provides guidelines for testing and commissioning power installations to ensure that they are safe and functional.
Maintenance and operation: The standard offers guidance on the maintenance and operation of power installations, including routine inspections, maintenance schedules, and emergency procedures.

Link to IEC 61936-1:2021

For those interested in accessing the full text of IEC 61936-1:2021, a link to the standard can be found on the IEC website or through various online databases that provide access to international standards. It is essential to note that IEC 61936-1:2021 is a copyrighted document, and users may need to purchase a copy or subscribe to a service that provides access to the standard. Usefulness and benefits The IEC 61936-1:2021 standard is

Implications for the Industry

IEC 61936-1:2021 has significant implications for the industry, particularly for companies and organizations involved in the design, construction, and maintenance of high-voltage power installations. Some of the key implications include:

Compliance: Companies must ensure that their power installations comply with the requirements of IEC 61936-1:2021 to avoid regulatory penalties and reputational damage.
Safety: The standard helps to ensure that power installations are safe for workers, the general public, and the environment, reducing the risk of accidents and injuries.
Efficiency: IEC 61936-1:2021 promotes efficient design, construction, and maintenance of power installations, which can lead to cost savings and improved performance.
Innovation: The standard provides a framework for innovation in the development of new technologies and solutions for high-voltage power installations.

Conclusion

IEC 61936-1:2021 is a critical standard for the power industry, providing guidelines for the design, construction, and maintenance of high-voltage power installations. By understanding the contents and implications of this standard, companies and organizations can ensure compliance, safety, efficiency, and innovation in their power installations. As the demand for electricity continues to grow, the importance of IEC 61936-1:2021 will only continue to increase, making it essential for industry professionals to stay up-to-date with the latest developments and best practices.

Recommendations

For companies and organizations involved in high-voltage power installations, we recommend:

Accessing the full text of IEC 61936-1:2021: Obtain a copy of the standard from the IEC website or through online databases to ensure compliance with its requirements.
Training and education: Provide training and education for employees on the requirements of IEC 61936-1:2021 and its implications for the industry.
Reviewing and updating designs and procedures: Review and update designs, procedures, and maintenance schedules to ensure compliance with the standard.
Engaging with industry experts: Engage with industry experts and consultants to ensure that power installations are designed, constructed, and maintained to the highest standards.

By following these recommendations, companies and organizations can ensure that their power installations are safe, efficient, and compliant with the requirements of IEC 61936-1:2021.

Since there is no academic "paper" written by a single author regarding this specific standard (as it is a technical standard published by the International Electrotechnical Commission), I have developed a comprehensive technical overview paper below.

This document is structured to analyze the standard, its scope, and its critical implications for electrical safety and infrastructure design.

Plot Point 2: The Collision of Digital and Physical

The 2021 version of the standard is distinct because it addresses the convergence of IT (Information Technology) and OT (Operational Technology).

Previously, you had high-voltage cables in one trench and data cables in another. Today, substations are "smart." They are run by digital relays and fiber optics. The "plot twist" in this revision is the intricate detailing of how to lay these cables together.

If you run a high-voltage cable too close to a data cable without the proper separation mandated by IEC 61936-1, the electromagnetic field can induce dangerous voltages in the data lines. This could destroy expensive equipment or, worse, shock an IT technician who thinks they are working on a safe, low-voltage network. The standard acts as the mediator in this electromagnetic conflict.

Scope (what this standard covers)

Applies to design, erection and verification of electrical power installations with nominal voltages above 1 kV AC (and corresponding DC systems).
Covers safety, clearances, insulation, earthing (grounding), protection, selection of equipment, testing and documentation for substations, switchgear rooms, overhead lines where they interface to installations, and similar high-voltage plant.
Does not cover plant-specific rules already covered in other standards (e.g., power generation units, railway traction, specific equipment types).

3.3 Gas-Insulated Switchgear (GIS) and SF6 Alternatives

A critical update involves the handling of switchgear. With the global push to reduce SF6 (Sulfur Hexafluoride) gas due to its high Global Warming Potential (GWP), the 2021 edition adapts design rules to accommodate GIS technologies that use alternative insulation gases (e.g., fluoroketones or compressed air). This includes updated pressure vessel safety guidelines and leak detection requirements.

4.2 Fire Protection and Oil Containment

For installations using oil-filled transformers and reactors, IEC 61936-1:2021 dictates:

Bunding (Containment): Oil containment pits must be sized to contain 100% of the oil volume of the largest transformer plus a safety margin for rainwater and foam used in firefighting.
Separation Distance: Firewalls or spatial separation between transformers to prevent fire spread are recalculated based on thermal radiation analysis.

Option 2: National Standard Bodies (Cheaper)

If you are in a member country, buy the identical national adoption:

USA: (No direct adoption) – Use ANSI/IEEE equivalents.
UK: BS EN 61936-1:2017+A1:2021 (Same text, ~£280)
Germany: DIN EN 61936-1 (VDE 0101-1)
Australia: AS/NZS 7000 (different but related)

Scope of the Standard

Voltage range: 1 kV to 220 kV (though principles apply up to 550 kV).
Installations: Indoor and outdoor substations, switchyards, transformer stations, and generator connection points.
Exclusions: Overhead lines, underground cables, and traction systems (railways) are covered by other standards (e.g., IEC 61865).