DANSK DSF/PREN IEC 62271-103 PDF

This part of IEC 62271 is applicable to three-phase, alternating current switches and switch disconnectors for their switching function, having making and breaking current ratings, for indoor and outdoor installations, for rated voltages above 1 kV up to and including 52 kV and for rated frequencies from 162/3 Hz up to and including 60 Hz. This standard is also applicable to single-pole switches used on three phase systems. This standard is also applicable to the operating devices of these switches and to their auxiliary equipment. Switch-disconnectors are also covered by IEC 62271-102 for their disconnecting function. Devices that require a dependent manual operation are not covered by this standard. General principles and provisions of this standard may also be applicable to single pole switches intended for application in single-phase systems. The requirements for dielectric tests and making and breaking tests should be in accordance with the requirements of the specific application. This standard establishes requirements for general, limited and special purpose switches used in distribution systems. It is assumed that opening and closing operations are performed according to the manufacturer's instructions. A making operation may immediately follow a breaking operation but a breaking operation should not immediately follow a making operation since the current to be broken may then exceed the rated breaking current of the switch. NOTE 1 – Except where special clarification is required, the term “switch” is used to refer to all kinds of switches and switch-disconnectors within the scope of this standard. NOTE 2 – Earthing switches are not covered by this standard. Earthing switches forming an integral part of a switch are covered by IEC 62271-102. NOTE 3 – This standard is not applicable to switching devices attached as an accessory to a high-voltage fuse assembly or its mounting and operated by opening and closing the fuse assembly.