IEC 60183 pdf download.Guidance for the selection of high-voltage A.C. cable systems
1 Scope
This International Standard is intended to give guidance in the selection of a.c. high-voltage cables and cable systems with extruded insulation and mainly to be used on three-phase alternating systems operating at voltages exceeding U = 1 kV (in this standard the term ‘high voltage’ is used to cover any cable above 1 kV). Submarine cables are not included in the scope. Guidance is given in the selection of the conductor size, insulation level and constructional requirements of cable to be used. In addition, information necessary to enable the appropriate selection to be made is summarized. Paper insulated power cables are not considered in this standard for their selection into cable systems. However, when selecting cables with extruded insulation to be connected together with existing paper insulated cables, particular consideration for their proper compatibility, accessories and operational characteristics should be made. Environmental aspects are mentioned at the level at which they may influence the selection of high-voltage cables and their application.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. 3.1 Voltages pertaining to the cable and its accessories NOTE Cables will henceforth be designated by U 0 /U (U m ) to provide guidance on compatibility with switchgear and transformers. Table 1 gives this information. 3.1.1 rated voltage U 0 rated r.m.s. power-frequency voltage between each conductor and screen or sheath for which cables and accessories are designed 3.1.2 rated voltage between conductors U rated r.m.s. power-frequency voltage between any two conductors for which cables and accessories are designed Note 1 to entry: This quantity only affects the design of non-radial field cables and accessories. 3.1.3 highest system voltage U m maximum r.m.s. power-frequency voltage between any two conductors for which cables and accessories are designed Note 1 to entry: It is the highest voltage that can be sustained under normal operating conditions at any time and at any point in a system and excludes temporary voltage variations due to fault conditions and the sudden disconnection of large loads. 3.1.4 peak impulse voltage U p peak value of the lightning impulse withstand voltage (and switching, where applicable) between each conductor and screen or sheath for which cables and accessories are designed 3.2 Voltages pertaining to the system on which cables and accessories are to be used 3.2.1 nominal voltage of system r.m.s. phase-to-phase voltage by which the system is designated and to which certain operating characteristics of the system are related 3.2.2 highest voltage of three-phase system highest r.m.s. phase-to-phase voltage which occurs under normal operating conditions at any time and at any point in the system Note 1 to entry: It excludes voltage transients (such as those due to system switching) and temporary voltage variation due to abnormal system conditions (such as those due to fault conditions or sudden disconnection of large loads). 3.2.3 lightning overvoltage phase-to-earth or phase-to-phase overvoltage at a given location in a system due to a lightning discharge or other cause, the wave-shape of which can be regarded, for insulation co-ordination purposes, as similar to the standard impulse Note 1 to entry: See 3.1 8.3 of IEC 60071 -1 :2006 and IEC 60071 -1 :2006/AMD1 :201 0 used for lightning impulse withstand tests. Note 2 to entry: Such overvoltages are usually unidirectional and of very short duration. 3.2.4 switching overvoltage phase-to-earth or phase-to-phase overvoltage at a given location in a system due to a switching operation in a system, the wave-shape of which can be regarded, for insulation co- ordination purpose, as similar to the standard impulse Note 1 to entry: See 3.1 8.2 of IEC 60071 -1 :2006 and IEC 60071 -1 :2006/AMD1 :201 0 used for switching impulse withstand tests.
IEC 60183 pdf download
