Iec 62271 209

IEC 62271-209: A Standard for Cable Connections for Gas-Insulated Switchgear

Gas-insulated switchgear (GIS) is a type of high-voltage switchgear that uses pressurized gas, such as sulfur hexafluoride (SF6), to insulate the conductors and equipment inside the metal enclosure. GIS has many advantages over conventional air-insulated switchgear, such as compactness, reliability, safety, and environmental friendliness. However, GIS also poses some challenges for cable connections, since the cable insulation and the gas insulation have different dielectric properties and thermal expansion coefficients. Therefore, special care is needed to ensure a reliable and durable connection between the cables and the GIS.

IEC 62271-209 is an international standard that covers the connection assembly of fluid-filled and extruded cables to GIS, in single- or three-phase arrangements where the cable terminations are fluid-filled or dry-type and there is a separating insulating barrier between the cable insulation and the gas insulation of the switchgear. The standard specifies the design, type testing, installation, operation, and maintenance of the cable connections. It also provides guidance on the selection of cables, cable terminations, and connection enclosures for different applications and environmental conditions.

Iec 62271 209

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The standard was first published in 2007 and revised in 2019. It is available from the IEC Webstore or from other authorized distributors. An extended version of the standard, which includes a redline version showing all changes of the technical content compared to the previous edition, was published in 2022. The standard is part of the IEC 62271 series on high-voltage switchgear and controlgear, which covers various aspects of design, testing, installation, operation, and maintenance of high-voltage equipment.

The main technical changes in the second edition of IEC 62271-209 are:

New numbering in accordance with ISO/IEC directives and to IEC 62271-1:2017;

Addition of a definition for plug-in cable termination, filling pressure and minimum function pressure for insulation;

An additional dielectric type test for plug-in cable termination was added; also a pressure type test as well as a leak rate test on the insulator of a cable termination was implemented;

New clause about safety practices;

New clause about influence of the product on the environment;

New informative annex on mechanical forces applied on the flange of the cable connection enclosure.

The standard is intended for use by manufacturers, suppliers, installers, operators, and maintenance personnel of GIS and cable connections. It is also useful for engineers, consultants, regulators, and researchers who are involved in the design, specification, testing, or evaluation of GIS and cable connections.

IEC 62271-209 is an important reference for ensuring the safety, reliability, and performance of cable connections for GIS. It provides state-of-the-art technical requirements and best practices for connecting fluid-filled and extruded cables to gas-insulated metal enclosed switchgear for rated voltages above 52 kV.

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