DC power cable description
DC750V DC cable and DC1500V DC cable are mainly used in DC systems such as subways, railways, and trams.
1. The main citations adopt standards
GB/T 12706-2008 《Rated voltage1kV(Um span>=1.2kV) to 35kV (Umm span>=40.5kV) extruded insulated power cables and accessories》
GB/T28429-2012 "Rail Transit 1500v and below DC traction cables and accessories"
GB/T 19666-2005 "General Rules for Flame-Retardant and Fire-Resistant Wires and Cables"
2.Main technical parameters
Rated voltage:DC750V、DC1500V
Conductor DC resistance: in compliance withGB/T2956-2008Requirements.
3.Structure
3.1Conductors comply with GB/T3956-2008requires that the surface of the conductor should be smooth, free of oil, burrs, and bulged or broken single wires.
3.2Insulation
The insulation material is made of domestic or imported high-quality cross-linked polyethylene (XLPE) material or ethylene-propylene rubber insulation
National standards for the nominal thickness of insulation stipulate that the average thickness of the insulation shall not be less than the nominal thickness, and the thickness of the thinnest point shall not be less than the nominal value90%-0.1 mm.
3.3Outer sheath:
Using low-smoke, halogen-free, flame-retardant (anti-rat, anti-UV) sheath material, the nominal thickness of the sheath complies with national standards.
4.Performance requirements
4.1The cable is low-smoke, halogen-free,Alike flame retardant and other properties.
4.2Low smoke: The low smoke performance of the cable when burning should be able to meet the requirements of < span style="font-size:16px;">GB/T 17651-1998Under the specified test conditions, the minimum smoke concentration generated during combustion is The light rate is not less than 60%.
4.2The flame retardant performance of the cable when burning is satisfactoryGB 12666.5-90RequiredAVertical burning test of similar bundled cables.
4.2halogen acid gas emission: the halogen-free performance of the cable sheath during combustion meets < /span>GB/T 17650.1Halogen acid gas generated during combustion under specified test conditions The amount of escape is not greater than 5mg/g.
4.2 pH value and conductivity: The pH value and conductivity of the gas escaped when the cable sheath is burned are tested according to GB/T17650.2Stipulates that PHThe value is not less than span>4.3, the conductivity is not greater than 10µs/mm.
4.8Operating temperature
The maximum allowable operating temperature of the cable is90
