T/HSXLXH 004-2024 rated voltage from 6kV (Um=7.2kV) to 35kV (Um=40.5kV) for extruded insulation and flame resistant power cables

Scope

Scope: This document specifies the symbols and codes, product representation methods, technical requirements, test methods, acceptance rules, marking, packaging, transportation, and storage for extruded insulated fire-resistant power cables with a rated voltage of 6kV (Um=7.2kV) to 35kV (Um=40.5kV). This document applies to fixed installation extruded insulated fire-resistant power cables with a rated voltage of 6kV (Um=7.2kV) to 35kV (Um=40.5kV). Main technical content: 6. Technical requirements 6.1 Conductors The conductors shall comply with the GB/T 3956-2008 standard for the second type of round wire compacted or profiled wire compacted structures. At 20°C, the maximum DC resistance of the conductors shall comply with the requirements specified in Table 2. The chemical composition of aluminum alloy cables shall comply with the GB/T 31840.2 standard. The surface of the conductors shall be smooth, free from oil stains, and without damage to the insulation or protruding or broken single wires. 6.2 Shielding and insulation 6.2.1 Conductor shielding The conductor shielding shall be non-metallic, consisting of an extruded semi-conductive layer or a semi-conductive tape applied first to the conductor followed by an extruded semi-conductive layer, and shall be closely integrated with the insulation. The surface of the conductor shielding shall be smooth, without obvious stranding protrusions, and free from sharp edges, particles, burnt marks, or scratches. 6.2.2 Insulation The insulation shall be cross-linked polyethylene (XLPE) in accordance with the GB/T 12706.2 or GB/T 12706.3 standard. The nominal thickness of the insulation shall comply with the requirements specified in Table 2. The thickness of any isolation layer or semi-conductive shielding layer outside the conductor or insulation shall not be included in the insulation thickness. The minimum measured thickness of the insulation at any point shall not be less than 90% of the specified nominal

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