NG TS 2.01 PDF

This Specification covers all National Grid substations with equipment installed for use on 66, 132, 275 and 400kV, 50 Hz systems. Substations operating at other voltages are expected to comply with the general provisions of this specification. It is applicable to both open-terminal air-insulated (AIS) and metal-enclosed gas-insulated (GIS) substation constructions (including hybrids thereof) and covers equipment operated at lower voltages on the same substation site. It is applicable to new construction and extensions to existing installations.

Where a 'CEGB Standard' substation is to be extended the project specification may also refer to obsolete Transmission Plant Specifications which are available from National Grid.

All National Grid plant and apparatus wholly within the substation and not covered more specifically by other National Grid Technical Specifications (TS) is within the scope of this document.

This document follows closely the format and content of IEC 61936-1, Power installations exceeding 1kV – common rules, and should be read in conjunction with BS 7354, Design of high-voltage open terminal stations. Regarding the hierarchy of requirements given in these documents, specific requirements detailed in National Grid Technical Specifications shall take precedence over guidance of BS 7354 which in turn shall take precedence over the general provisions of IEC 61936-1.