IEC 61936

IEC 61936
Title	IEC 61936
Status	Published
Year	2010
Organization	International Electrotechnical Commission
Scope	Installation of high-voltage electrical installations
Language	English

IEC 61936 IEC 61936 is an international standard for the design, erection and verification of high-voltage electrical installations. It provides technical rules and safety guidance for systems at voltages above 1 kV AC and 1.5 kV DC, addressing insulation, clearances, earthing, and testing practices. The standard is intended for use by electrical engineers, utilities, manufacturers and inspection bodies engaged with transmission substations, distribution networks and industrial high-voltage equipment.

Scope and Purpose

The standard covers installation requirements for permanent high-voltage plant, including substations, switchgear, transformers and overhead lines, and specifies criteria for safety, performance and testing. It aims to harmonize practices across jurisdictions by defining insulation coordination, protective earthing, clearance distances and lightning protection for equipment exposed to transmission and distribution environments. Users include engineers from Siemens, ABB Group, Schneider Electric, General Electric, and utilities such as National Grid (UK), Électricité de France, American Electric Power, and State Grid Corporation of China.

History and Development

Development involved technical committees within the International Electrotechnical Commission and input from national committees like British Standards Institution, ANSI, DIN (Germany), AFNOR and JISC. Early high-voltage practices were influenced by pioneering work at sites like Edison Electric Light Station and research by institutions such as École Polytechnique, Massachusetts Institute of Technology, ETH Zurich, and Imperial College London. Revisions reflected advances in insulation materials pioneered by DuPont, improvements in substation design promoted by RWE, and international harmonization efforts following initiatives by IEC Technical Committee 22 and CIGRÉ. Significant updates paralleled developments in surge protection from manufacturers like Eaton Corporation and grounding studies from National Renewable Energy Laboratory.

Key Requirements and Provisions

IEC 61936 sets out requirements for insulation coordination referencing concepts used by CENELEC, dielectric testing practised by Underwriters Laboratories, and impulse withstand criteria developed in collaboration with utilities like TenneT. It specifies minimum clearances and creepage distances informed by testing at laboratories such as Fraunhofer Society and VDE Institute. Provisions include earthing and bonding practices consistent with guidelines from IEEE committees, lightning protection measures aligned with recommendations from World Meteorological Organization and transient protection devices produced by ABB Group and Siemens. The standard details commissioning and routine testing procedures similar to protocols used by National Grid (UK), Hydro-Québec, and Eskom.

Application and Compliance

Application spans transmission substations, converter stations used by Siemens Energy, renewable integration points for developers like Vestas and Ørsted, and industrial plants operated by firms such as ArcelorMittal and Vale. Compliance is assessed by inspection bodies including SGS, TÜV SÜD, Intertek, and national regulators like Ofgem and Federal Energy Regulatory Commission. Conformance activities involve coordination with procurement standards used by World Bank financed projects, safety audits performed by Lloyd's Register, and contractual requirements in EPC agreements with companies such as Bechtel and Fluor Corporation.

Relationship to Other Standards

IEC 61936 interfaces with a suite of international and regional standards: insulation coordination standards from IEC 60071, switchgear requirements in IEC 62271, protection and control conventions in IEC 61850, and electromagnetic compatibility guidance in IEC 61000. It complements national codes such as BS 6626 and AS/NZS 3008, and aligns with testing methodology from ISO committees and occupational safety frameworks referenced by International Labour Organization. Coordination with transmission planning documents from organizations like ENTSO-E and design guides from CIGRÉ ensures interoperability across cross-border interconnections.

Implementation Challenges and Safety Considerations

Implementers face challenges integrating legacy equipment from manufacturers like Westinghouse Electric Company with new installations by Hitachi Energy, managing insulation aging observed in studies by Electric Power Research Institute, and ensuring correct earthing in complex soil conditions referenced in geotechnical work by British Geological Survey. Safety considerations address arc-flash risk assessment methods promoted by IEEE 1584, live-line maintenance techniques used by Bonneville Power Administration, and training standards from institutions like OMRON Foundation and Shell Global safety programs. Effective implementation requires multidisciplinary coordination among designers, operators, manufacturers and regulators such as Environmental Protection Agency where environmental impact and electrical safety intersect.

Category:Electrical standards