time：2026-09-20
On September 7, exciting news came from China’s HVDC cable material sector: the ±320kV eco-friendly PP insulated DC cable, jointly developed by CSG EPRI, Wanma Macromolecule, Guangdong Power Grid Zhuhai Power Supply Bureau, ZTTSC and Harbin University of Science and Technology, has successfully passed the type test!
This marks China’s first adoption of thermoplastic PP insulation materials in the HVDC cable sector with completed systematic test assessments. It represents a key technological breakthrough in China's independent development of eco-friendly HVDC cables, and will provide a green and low-carbon cable system solution for long-distance offshore wind power transmission, power supply to urban load centers and the construction of new-type power systems.
Empowering Green DC Cables with a Chinese Core
VDC cables are critical equipment for renewable energy power transmission, while cable compounds serve as the "heart" material that determines cable performance. As an important member of the joint R&D team, Wanma Macromolecule played a deep role in this full-chain technological development effort.
Facing a series of core technical challenges, including the development of green cable materials, the extrusion process of large-thickness thermoplastic insulation, and the matching verification of cables and supporting accessories, the R&D team worked in close coordination to achieve a breakthrough. It has successfully developed ±320kV eco-friendly DC PP insulation and shielding materials, and conquered the key processes for extrusion and cooling of thermoplastic insulation for large-cross-section and large-thickness HVDC cables.
The ±320kV PP insulated cable developed in this project achieves a conductor operating temperature of 90°C, with all performance indicators meeting the requirements of GB/T 31489.1. This breakthrough addresses the engineering bottleneck that PP materials are difficult to adapt to high-capacity HVDC power transmission, holding significant value for the development of eco-friendly HVDC cable equipment and the support of renewable energy transmission.
Moving Toward Green, Wanma Macromolecule Creates a Low-Carbon Future Together
Moving forward, the joint R&D team will carry out long-term reliability assessment and engineering demonstration applications for HVDC PP insulated cables. The team will accelerate the iterative upgrading of eco-friendly HVDC cable products with higher voltage levels, providing strong support for the green and low-carbon energy transition.
As a dedicated player in the cable material industry, Wanma Macromolecule always adheres to industrial upgrading driven by material innovation and continuously increases R&D investment in eco-friendly cable materials. In the future, the company will continue to cooperate with upstream and downstream partners in the industrial chain, promote high-level technological self-reliance in China’s cable material sector, and contribute to the construction of new-type power systems and the achievement of the dual-carbon goals!
