IEC 62271-209:2019 pdf download

IEC 62271-209:2019 pdf download.High-voltage switchgear and controlgear – Part 209: Cable connections for gas-insulated metal-enclosed switchgear for rated voltages above 52 kV
1 Scope
This part of IEC 62271 covers the connection assembly of fluid-filled and extruded cables to gas-insulated metal enclosed switchgear (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 purpose of this document is to establish electrical and mechanical interchangeability between cable terminations and the gas-insulated metal-enclosed switchgear and to determine the limits of supply. It complements and amends, if applicable, the relevant IEC standards. For the purpose of this document the term “switchgear” is used for “gas-insulated metal enclosed switchgear”. It does not cover directly immersed cable terminations, as described in CIGRE brochure 89 [4]
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: • IEC Electropedia: available at http://www.electropedia.org/ • ISO Online browsing platform: available at http://www.iso.org/obp 3.1 cable termination equipment fitted to the end of a cable to ensure electrical connection with other parts of the system and to maintain the insulation up to the point of connection 3.1 .1 fluid-filled cable termination cable termination which comprises a separating insulating barrier between the cable insulation and the gas insulation of switchgear, including a fluid 3.1 .2 dry-type cable termination cable termination which comprises an elastomeric electrical stress control component in direct contact with a separating insulating barrier (insulator) between the cable insulation and the gas insulation of the switchgear, not requiring any fluid 3.2 main circuit end terminal part of the main circuit of a gas-insulated metal enclosed switchgear forming part of the connection interface 3.3 cable connection enclosure part of the gas-insulated metal-enclosed switchgear which houses the cable termination and the main circuit end terminal 3.4 cable connection assembly combination of a cable termination, a cable connection enclosure and a main circuit end terminal, which mechanically and electrically connects the cable to the gas-insulated metal enclosed switchgear 3.5 plug-in cable termination cable termination where cable/stress cone assembly can be engaged into the insulator assembly that is already installed into switchgear enclosure 3.6 design pressure pressure used to determine the design of the enclosure and the components of the cable termination subjected to that pressure Note 1 to entry: It is at least equal to the maximum pressure in the enclosure at the highest temperature that the gas used for insulation can reach under specified maximum service conditions. 3.7 fluid liquid or gas for insulation purposes 3.8 cable system cable with installed accessories 3.9 filling pressure p re for insulation filling density ρ re for insulation pressure (in Pa), for insulation, referred to the standard atmospheric air conditions of 20 °C and 1 01 ,3 kPa, which may be expressed in relative or absolute terms (or density), to which the assembly is filled before being put into service 3.1 0 minimum functional pressure p me for insulation minimum functional density ρ me for insulation pressure (in Pa), for insulation, referred to the standard atmospheric air conditions of 20 °C and 1 01 ,3 kPa, which may be expressed in relative or absolute terms (or density), at which and above which the characteristics of the switchgear-cable connection are maintained and at which replenishment becomes necessary
5 Ratings
5.1 General
When dimensioning the cable connection assembly, the following rated values shall apply:
a) rated voltage of the equipment of the cable connection (U rm );
b) rated insulation level (U p , U d and U s where applicable);
c) rated frequency (f r )
d) rated continuous current (I r );
e) rated short-time withstand current (I k );
f) rated peak withstand current (I p );
g) rated duration of short circuit (t k ).