T/HSXLXH 003-2023 Active

Scope: This document specifies the voltage marking and materials, product models and representation methods, product structure, dimensions, and testing requirements, acceptance rules, delivery length, marking of finished cables, product packaging, transportation, and storage for polypropylene insulated power cables with a rated voltage of 6kV (Um=7.2kV) to 35kV (Um=40.5kV). This document applies to fixed-installation rated voltage 6kV (Um=7.2kV) to 35kV (Um=40.5kV) extruded polypropylene insulated power cables in distribution networks or industrial installations; Main technical content: 4. Voltage marking and materials 4.1 Rated voltage The rated voltage is the reference voltage used for cable design and performance testing. In this document, the rated voltage U0/U (Um) of the cable is marked as follows: U0/U (Um) = 3.6/6 (7.2kV), 6/6 (7.2kV), 6/10 (12kV), 8.7/10 (12kV), 8.7/15 (17.5kV), 12/20 (24kV), 18/20 (24kV), 18/30 (36kV), 21/35 (40.5kV), 26/35 (40.5kV). In the rated voltage marking U0/U (Um) of the cable: - U0 is the rated working frequency voltage between the conductor and the ground or metal shielding used in cable design; - U is the rated working frequency voltage between the conductors used in cable design; - Um is the maximum value of the "highest system voltage" that the equipment can use (according to GB/T 156). For the rated voltage of a given application cable, it should be suitable for the operating conditions of the system in which the cable is located. To facilitate the selection of cables, the system is divided into the following three categories: - Class A cables: In this class of systems, when any phase conductor contacts the ground or grounded conductor, it can be disconnected from the system within 1 minute; - Class B cables: This class of systems can operate for a short time under single-phase grounding faults, and the grounding fault time should not exceed 1 hour according to JB/T 8996; for the cables included in this document, it should