ZDVolt designs and manufactures AC and DC bushings up to 1100 kV. In addition, the company produces hollow insulators as well as standard station post insulators, with products covering porcelain and composite substation post insulators up to 1000 kV.
Single-piece porcelain post insulators can reach up to 2 meters in height with a diameter of 800 mm. Single piece composite "Bamboo-type" post insulators can reach up to 6 meters in height with a diameter of 800 mm. All products fully comply with ANSI/IEEE C29 standards for porcelain and composite TR series, as well as IEC 60273 and IEC 60168 C-series standards.
Over the past 20+ years of global ultra-high voltage (UHV) development, dry-forming isostatic production equipment and technologies have advanced significantly. Building on more than two decades of experience, ZDVolt has implemented patented enhanced cold isostatic pressing (CIP) dry-forming equipment along with automated machining technologies. These enable production of single units with a maximum diameter of 800 mm and height (length) up to 6 meters.
While maintaining consistent C130-grade porcelain strength, this process significantly reduces production time—from 60 days with traditional wet processes to just 10 days—greatly improving forming efficiency. At the same time, it ensures consistent quality while substantially lowering production costs. Porcelain post insulators can also be coated with RTV or semi-conductive glaze according to specific requirements.
ZDVolt's patented BambuX™ series of composite post insulators are designed and manufactured to meet IEC and ANSI/IEEE standards for AC applications up to 1000 kV. The company uses a Continuous Windings Fiberglass Pipe (CWFP) to produce fiberglass-reinforced plastic (FRP) insulating tubes, achieving strength superior to conventional filament winding methods.
For ±500 kV DC applications, a single section can achieve a cantilever load of 12.5 kN. For 1000 kV AC systems, three sections are used to achieve an SCL of 3000 lbs, while 765 kV / 750 kV systems use two sections with the same SCL rating.
The patented BambuX™ design and manufacturing technology ensures insulation performance and mechanical strength while eliminating issues commonly associated with solid composite insulators, such as cracking, as well as problems found in filled composite insulators, including internal monitoring and air leakage. In addition, the cost of high-voltage BambuX™ composite post insulators is comparable to that of high-strength porcelain post insulators.
BambuX™ Composite HVDC Post
Engineered specifically for DC electric field distributions, this product features an enhanced creepage structure and high-hydrophobicity silicone rubber. Ideal for HVDC converter stations and DC switchyards, it offers outstanding DC voltage withstand capability, superior anti-pollution flashover performance, and exceptional long-term stability.
View Details
BambuX™ Composite Post
Engineered with advanced composite materials, this product achieves a triple breakthrough in lightweight design, high strength, and superior seismic performance compared to traditional alternatives. It substantially reduces transportation and installation costs, significantly enhances mechanical reliability, and ensures stable operation under extreme conditions such as earthquake-prone regions—delivering a safer, more durable support guarantee for HVDC transmission systems.
View Details
Porcelain Post
As a critical external insulation component in power transmission systems, the porcelain post insulator is distinguished by its superior pollution flashover resistance and long-term operational stability. The core body is formulated from high-alumina porcelain and sintered at high temperatures, resulting in a dense internal microstructure that delivers exceptional mechanical strength and anti-aging properties. Its surface is coated with a hydrophobic anti-pollution glaze, which significantly reduces leakage currents and the probability of partial discharge under contaminated conditions by inhibiting surface water film formation and increasing the creepage distance, thereby effectively preventing pollution flashover incidents. Furthermore, with mature cementing processes and robust mechanical connections, the insulator withstands long-term conductor tension, wind loads, and vibrational impacts. It maintains stable insulation performance and mechanical reliability even under harsh conditions such as heavy pollution and high altitudes, drastically minimizing O&M costs and line outage risks to serve as a cornerstone for the safe and stable operation of transmission lines.
View Details