Common Models:
YJV-35kV, YJLV-35kV: Cross-linked polyethylene insulated power cables, widely used in urban power grids and industrial power supply.
YJV22-35kV, YJLV22-35kV: Armored cross-linked polyethylene insulated power cables, suitable for applications requiring mechanical protection.
YJV32-35kV, YJLV32-35kV: Phase-shielded cross-linked polyethylene insulated power cables, suitable for applications requiring high reliability.
1. Classification by Voltage Level:
35kV power cables are medium-voltage power cables, primarily used in urban underground power grids, power station outbound lines, internal power supplies for industrial and mining enterprises, and underwater transmission lines across rivers and seas.
2. Classification by Insulation Material:
Cross-linked polyethylene (XLPE) insulated power cables: This is the most common type of 35kV power cable, offering high insulation performance and a long service life.
Rubber insulated power cables: Suitable for specific environments, but less commonly used.
Oil-paper insulated power cables: Gradually phased out.
3. Classification by conductor material:
Copper core cables, such as YJV-35kV and YJLV-35kV, offer high conductivity and corrosion resistance.
Aluminum core cables, such as YJV22-35kV and YJLV22-35kV, are lower cost but slightly inferior in conductivity to copper core cables.
4. Classification by structural features:
Armored cables, such as WDZ-YJV-35kV and WDZ-YJLV-35kV, are suitable for applications requiring mechanical protection.
Unarmored cables, such as YJV-35kV and YJLV-35kV, are suitable for indoor or underground installation.
5. Classification by application:
General power cables, used in power transmission and distribution systems, are the most common type.
Control cables, used for control signal transmission.
Communication cables, used in communication systems.
The model specifications for 35kV power cables are primarily based on the following standards and regulations:
1. Model Designation:
The model number of a 35kV power cable is typically composed of the initials of the Chinese phonetic alphabet for the insulation material, conductor material, inner sheath material, and outer sheath material. For example, YJV represents a power cable with cross-linked polyethylene insulation and a polyvinyl chloride sheath, while YJLV represents a power cable with cross-linked polyethylene insulation, aluminum tape armor, and a polyvinyl chloride sheath.
2. Common Models:
YJV: Cross-linked polyethylene insulation and a polyvinyl chloride sheath.
YJLV: Cross-linked polyethylene insulation, aluminum tape armor, and a polyvinyl chloride sheath.
YJV22: Cross-linked polyethylene insulation, a polyvinyl chloride sheath, and a steel tape armor.
YJLV22: Cross-linked polyethylene insulation, an aluminum tape armor, a polyvinyl chloride sheath, and a steel tape armor.
3. Rated Voltage and Nominal Cross-sectional Area:
The rated voltage of 35kV power cable is Um = 40.5kV, and the nominal cross-sectional area ranges from 185mm² to 400mm².
Common nominal cross-sectional areas include 185mm², 240mm², 300mm², and 400mm².
4. Standard Compliance:
GB/T 12706.4-2020: Power cables and accessories with extruded insulation, rated voltages of 1kV (Um = 12kV) to 35kV (Um = 40.5kV).
GB/T 31840.3-2015: Power cables with aluminum alloy core, extruded insulation, rated voltages of 1kV (Um = 1.2kV) to 35kV (Um = 40.5kV).
GB/T 12976.2-2008: Paper-insulated power cables with rated voltages up to 35 kV (Um=40.5 kV) and their accessories.
5. Technical Requirements:
The cables must comply with the technical specifications for conductor shielding, insulation shielding, metallic shielding, inner lining and filling layers, and outer sheath.
The insulation thickness, outer sheath material (e.g., polyvinyl chloride or polyethylene), and armor type (e.g., steel tape or aluminum tape) of the cables must comply with relevant standards.
6. Scope of Application:
35 kV power cables are widely used in high-voltage transmission lines, substation connections, and power transmission for industrial enterprises.
