Can PE pipe wear high voltage cable?

In construction and municipal engineering, PE pipes are widely used in water supply and drainage, communication and other fields due to their advantages of corrosion resistance, good flexibility and convenient construction. But many users will ask: Can PE pipes be used for the threading protection of high-voltage cables? As a professional pipeline solution provider, AD Pipeline will analyze you in detail from the perspective of material characteristics and engineering specifications. Feasibility analysis of

PE pipes through high-voltage cables

PE pipes (polyethylene pipes) have good insulation properties, and their volume resistivity is usually greater than 10 ¬ Ω · cm, which performs well in the laying of medium and low voltage cables. However, for high-voltage cables with a rated voltage of 10kV and above, the following factors need to be paid attention to:

1. Insulation strength: The power frequency breakdown strength of ordinary PE pipe is about 20-30kV/mm, although it meets the basic insulation requirements, but the partial discharge generated by the long-term operation of the high-voltage cable may accelerate the aging of the material

2. Thermal stability: The continuous use temperature of PE pipe is generally -40 ℃~ 60 ℃. When the high-voltage cable is overloaded, the temperature rise may exceed its tolerance range, resulting in the deformation of the pipe

3. Mechanical properties: High-voltage cable laying is usually accompanied by large traction. It is necessary to ensure that the PE pipe has sufficient ring stiffness (SN8 and above grades are recommended)

Professional advice for AD pipes

As an industry standard participant, AD pipes are recommended in high-voltage cable protection projects:

1. Voltage grade division: Thickened PE power pipes (such as AD MPP modified PE pipes) can be used for cables below 10kV, and special power bushings

2 are recommended for 20kV and above. Laying environment adaptation: Soil thermal resistance coefficient testing is required during direct burial laying to ensure that the working temperature of the pipe does not exceed the design threshold

3. Special treatment requirements: In a strong electric field environment, PE pipes modified by special formulations should be used. The antistatic PE pipes of AD pipes can be controlled at 10-10Ω · cm by adding carbon black masterbatch, effectively eliminating static electricity accumulation

Project implementation precautions

1. Pipe selection: should be in accordance with the "Electric Power Engineering Cable Design Standard" GB50217, choose to meet the GB/T 15558.1 standard of PE pipe, AD Pipeline to provide φ 110-φ 200mm specifications of power pipes are through the type test

2. Construction specifications:

- pipe top buried depth of not less than 0.7m, through the section should be installed casing protection

- when using trenchless technology, traction speed control within 1.5m/min

- interface to do sealing treatment, it is recommended to use AD special hot-melt docking machine to ensure the welding quality

3. Post-maintenance: regular inspection of pipeline grounding resistance (should be less than 10Ω), found that pipe cracks or discoloration in time to replace

Conclusion

PE pipe under specific conditions can be used for high-voltage cable protection, but strictly follow the material selection, engineering design and construction specifications. AD Pipeline reminds users that special pipes such as MPP power pipes or CPVC power pipes should be preferred in high-voltage projects of 110kV and above. If you have any questions about the specific project plan, you can contact AD Pipeline Technical Service Center to obtain customized solutions to ensure the safe and stable operation of the power transmission system.