IEC 62067 pdf download

IEC 62067 pdf download.Power cables with extruded insulation and their accessories for rated voltages above 150 kV (U m = 170 kV) up to 500 kV (U m = 550 kV) – Test methods and requirements
1 Scope
This International Standard specifies test methods and requirements for power cable systems, cables with extruded insulation and their accessories for fixed installations, for rated voltages above 1 50 kV (U m = 1 70 kV) up to and including 500 kV (U m = 550 kV). The requirements apply to single-core cables and to their accessories for usual conditions of installation and operation, but not to special cables and their accessories, such as submarine cables, for which modifications to the standard tests may be necessary or special test conditions may need to be devised. This standard does not cover transition joints between cables with extruded insulation and paper insulated cables.
3 Terms and definitions
For the purposes of this document the following terms and definitions apply. 3.1 Definitions of dimensional values (thicknesses, cross-sections, etc.) 3.1.1 nominal value value by which a quantity is designated and which is often used in tables NOTE Usually, in this standard, nominal values give rise to values to be checked by measurements taking into account specified tolerances.3.1.2 median value when several test results have been obtained and ordered in an increasing (or decreasing) succession, middle value if the number of available values is odd, and mean of the two middle values if the number is even 3.2 Definitions concerning tests 3.2.1 routine test tests made by the manufacturer on each manufactured component (length of cable or accessory) to check that the component meets the specified requirements 3.2.2 sample test tests made by the manufacturer on samples of complete cable, or components taken from a complete cable or accessory, at a specified frequency, so as to verify that the finished product meets the specified requirements 3.2.3 type test tests made before supplying, on a general commercial basis, a type of cable system covered by this standard, in order to demonstrate satisfactory performance characteristics to meet the intended application NOTE Once successfully completed, these tests need not be repeated, unless changes are made in the cable or accessory with respect to materials, manufacturing process, design or design electrical stress levels, which might adversely change the performance characteristics. 3.2.4 prequalification test test made before supplying, on a general commercial basis, a type of cable system covered by this standard, in order to demonstrate satisfactory long term performance of the complete cable system 3.2.5 extension of prequalification test tests made before supplying, on a general commercial basis, a type of cable system covered by this standard, in order to demonstrate satisfactory long term performance of the complete cable system, taking into account an already prequalified cable system3.2.6 electrical test after installation tests made to demonstrate the integrity of the cable system as installed 3.3 Other definitions 3.3.1 cable system cable with installed accessories including components used for thermomechanical restraint of systems limited to those used for terminations and joints only 3.3.2 nominal electrical stress electrical stress calculated at U 0 using nominal dimensions
4 Voltage designations and materials
4.1 Rated voltages In this standard, the symbols U 0 , U and U m are used to designate the rated voltages of cables and accessories where these symbols have the meanings given in IEC 601 83. 4.2 Cable insulating materials This standard applies to cables insulated with the materials listed in Table 1 . It also specifies, for cables with each type of insulating compound, the maximum operating conductor temperatures on which the specified test conditions are based. 4.3 Cable metal screens/sheaths This standard applies to the various designs in use. It covers designs providing a radial water tightness and other designs. Designs that provide radial watertightness mainly consist of • metal sheaths, • longitudinally applied metal tapes or foils bonded to the oversheath, • composite screens, involving a bunch of wires and, in addition, either a metal sheath or a metal tape or foil bonded to the oversheath, acting as a radial water impermeable barrier (see Clause 5), and other designs such as • bunch of metal wires only. NOTE In all cases the metal screen/sheath should be able to carry the total fault current.