The standard "DS/HD 620 S2 Distribution cables with extruded insulation - Rated voltages from 3,6/6 (7,2) Kv to 20,8/36 (42) Kv" published among Danish standards describes the requirements for cables with extruded insulation and nominal voltages from 3,6/6 (7,2) kV to 20,8/36(42) kV. These requirements also apply to power distribution systems whose voltages do not exceed the maximum RMS value of the system voltage. This standard contains the general requirements applicable to these cables, unless otherwise stated.
-kv-tan-208-36-(42)-kv-a-kadar-olan.jpg "DS/HD 620 S2 Extruded Insulated Distribution Cables - Rated Voltages from 3,6/6 (7,2) Kv to 20,8/36 (42) Kv")
The test methods specified in this standard are included in EN 60228, EN 60229, EN 60332-1-2, EN 60811, EN 60885-3, HD 605 and HD 632 standards.
This standard contains references to long-term tests, mainly collected in the HD 605 standard. These long-term tests are considered essential and reflect the best available information for current cable design. They relate to specific designs and different philosophies regarding adequate precautions against the effects of water. However, an attempt is being made to reduce this large number of different tests.
The purposes of this standard are:
Cable extrusion is a specialized manufacturing process that involves the precise extrusion of polytetrafluoroethylene polymer (PTFE), commonly known as Teflon, to create cables with exceptional properties. Known for its excellent temperature resistance, chemical inertness, and electrical insulation, Teflon is an ideal material for demanding applications. The applied extrusion process ensures uniformity, precision, and consistency in PTFE extrusion, resulting in cables with high performance properties. PTFE cables offer superior temperature resistance, excellent dielectric properties, low friction, and resistance to chemicals, making them suitable for harsh industries and environments.
According to this standard, the conductors must also be plain or metal-coated annealed copper or plain or metal-coated aluminium (earthing conductor) or aluminium alloy in accordance with the requirements of the standard “EN 60228 Conductors of insulated cables (IEC 60228)”. The conductors must be circular or sector-shaped and made of solid metal or stranded. The resistance of each conductor at 20 degrees must comply with the requirements of the EN 60228 standard for the relevant conductor class.
The insulation shall be an extruded solid compound of one of the types listed in this standard and as specified for each type of cable. Test requirements for insulating compounds are specified in the tables given in the standard. The insulation shall be applied by extrusion and shall form a compact and homogeneous body. If a conductor or conductor screen is provided, it shall be applied so that it fits tightly to it and it shall be possible to remove the insulation, including the conductor screen or insulating screen if attached.
The average value of the thickness of the insulation, excluding the semiconductor layers, shall not be less than the value specified in the relevant sections. However, the thickness at any location may be less than the specified value, provided that the difference does not exceed 0,1 mm plus 10 percent of the specified value. Compliance shall be checked by the test method given in the HD 605 standard.
Before and after ageing, the insulation must have suitable mechanical properties. Compliance must be checked by performing the tests shown in the table given in the standard.
Among the numerous testing, measurement, analysis and evaluation studies that our organization has carried out for businesses in various sectors, it also provides testing services defined in the standard “DS/HD 620 S2 Extruded insulated distribution cables - Rated voltages from 3,6/6 (7,2) Kv to 20,8/36 (42) Kv” with its trained and expert staff and advanced technological equipment.
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