IEC 63026:2019 pdf download

IEC 63026:2019 pdf download.Submarine power cables with extruded insulation and their accessories for rated voltages from 6 kV
1 Scope
This document specifies test methods and requirements for power cable systems, cables with extruded insulation and their accessories for fixed submarine installations, for rated voltages from 6 kV (U m = 7,2 kV) up to 60 kV (U m = 72,5 kV). This document includes the electrical tests and the physical tests on materials and components as well as the specific mechanical tests that are applicable to submarine cable systems. The requirements apply to armoured single-core cables and three-core cables in combination with their accessories, terminations and joints for usual conditions of installation and operation, but not to special cables and their accessories, such as submarine cables for dynamic applications (i.e. for direct connection to a floating structure), for which modifications to the standard tests can be necessary or special test conditions be devised. This document is applicable to submarine cables installed in permanently submerged conditions with water depths up to 250 m. NOTE This document does not include accessories having a mechanical function only, such as hang-offs or armour clamps.
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 1 to entry: Usually, in this document, 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 test 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 test made by the manufacturer on samples of completed cable or components taken from a completed cable or accessory, at a specified frequency so as to verify that the finished product meets the specified requirements 3.2.3 type test test made before supplying on a general commercial basis a type of cable system covered by IEC 63026, in order to demonstrate satisfactory performance characteristics to meet the intended application Note 1 to entry: 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 electrical test after installation test made to demonstrate the integrity of the cable system as installed Note 1 to entry: Integrated optical elements, if present, will be tested upon customer request. Tests to be defined on agreement between customer and manufacturer.3.3 Other definitions 3.3.1 cable system cable with installed accessories including components used for thermo-mechanical 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 3.3.3 test object object, which is a cable length or an accessory, to be subjected to testing3.3.4 test assembly assembly, which is a combination of series connected test objects, i.e. cable and accessories, simultaneously under test 3.4 Definitions concerning test objects 3.4.1 extrusion length length of cable conductor with the insulation and semi-conducting layers continuously extruded in the same non-interrupted extrusion operation 3.4.2 manufacturing length whole extrusion length (or parts thereof if cut), where construction elements (outside the outer semi-conducting layer) have been applied 3.4.3 delivery length completed cable length, typically on a drum, in a coil or on a turntable 3.4.4 factory joint joint between extrusion lengths/manufacturing lengths that is manufactured under controlled factory conditions Note 1 to entry: Factory joints have the same mechanical and electrical performance as the original cable and are generally fully flexible.