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Explore our core product range — precision-engineered for high-voltage transformer and industrial electrical applications.
Flexible braided copper wire is a multi-strand conductor composed of numerous fine copper wires intricately woven or braided together to form a highly conductive, mechanically resilient cable. Unlike solid copper conductors, the braided architecture allows the wire to flex repeatedly without fatigue cracking, making it indispensable in dynamic, high-vibration, and thermally stressed environments — precisely the conditions found inside high-voltage transformers.
In high-voltage transformer connections, these wires serve as the critical link between transformer windings, tap changers, bushings, and external bus systems. The demands are extreme: the conductor must handle currents ranging from hundreds to thousands of amperes, withstand dielectric stress, resist thermal cycling, and maintain near-zero contact resistance over decades of service. Flexible braided copper wire meets all these requirements with superior performance compared to rigid copper bars or standard stranded cables.
The global market for flexible braided copper wire has experienced robust growth over the past decade, underpinned by the accelerating expansion of power infrastructure, renewable energy integration, and the electrification of transportation. According to industry analysts, the global flexible copper connector and braided wire market was valued at over USD 2.8 billion in 2023, with a projected compound annual growth rate (CAGR) of approximately 6.5% through 2030.
Key growth drivers include the massive rollout of high-voltage direct current (HVDC) transmission systems across Asia, Europe, and North America; the proliferation of large-scale solar and wind power plants requiring step-up transformers; and the rapid expansion of electric vehicle (EV) charging infrastructure demanding compact, high-current flexible connections. China, as the world's largest manufacturer and consumer of electrical equipment, accounts for a dominant share of global braided copper wire production, with leading manufacturers such as Zhejiang Xingma Copper Industry Co., Ltd. supplying premium-grade products to domestic and international markets.
Pure copper braiding achieves up to 99.9% IACS conductivity, minimizing resistive losses in high-voltage transformer connections and maximizing power transfer efficiency.
Thousands of fine copper strands work together to absorb vibration, thermal expansion, and mechanical stress — extending transformer service life significantly.
Engineered to operate reliably across wide temperature ranges, from cryogenic environments to sustained high-load operating temperatures exceeding 200°C in specialty applications.
Flexible braided copper wire is deployed across a spectrum of critical industrial and commercial transformer applications.
In utility-scale power generation plants — whether coal, gas, nuclear, or renewable — step-up transformers elevate generator output voltage from medium to extra-high voltage (EHV) for long-distance transmission. The internal winding-to-bushing connections must accommodate significant thermal cycling as load varies throughout the day. Flexible braided copper wire provides the mechanical compliance needed to absorb differential thermal expansion between copper windings and steel transformer tanks, preventing fatigue fractures that could cause catastrophic insulation failure.
High-voltage direct current (HVDC) converter transformers are among the most demanding electrical components ever engineered, operating at voltages exceeding 800 kV in modern ultra-HVDC (UHVDC) systems. The valve-side winding connections experience both AC and DC stress simultaneously, combined with harmonic currents from thyristor or IGBT converter valves. Flexible braided copper wire with tinned or silver-plated surfaces is specified for these connections to ensure stable contact resistance and resist the oxidation that can develop under the combined thermal and electrical stress of HVDC operation.
Electric railway systems — including high-speed rail, metro, and light rail — rely on traction transformers mounted on rolling stock. These transformers endure constant vibration, shock loads, and rapid temperature changes as trains accelerate and brake. Flexible braided copper wire is the only practical conductor technology that can survive millions of flex cycles in this environment while maintaining the low-resistance connections required for efficient traction power delivery. Leading railway OEMs in Europe, Japan, and China specify braided copper wire exclusively for traction transformer internal connections.
Electric arc furnaces (EAF) used in steelmaking and industrial induction furnaces demand transformer connections capable of handling short-circuit currents tens of times the rated current during arc ignition. The secondary-side connections of furnace transformers — which may carry 100,000 amperes or more at low voltage — require extremely flexible, low-impedance copper braids that can withstand the violent electromagnetic forces generated during arc events. Rectangular or flat braided copper conductors are preferred in these applications for their high current density and ease of termination.
Offshore wind turbines and utility-scale solar farms present unique challenges for transformer connections. Salt-laden marine air, UV radiation, and continuous vibration from wind loading create a hostile environment for electrical connections. Flexible braided copper wire with specialized jacketing — including PTFE, silicone, or cross-linked polyethylene insulation — is used for the connections between wind turbine generators and their step-up transformers, as well as for solar inverter output connections to pad-mounted transformers. The flexibility of braided wire simplifies installation in the confined nacelle spaces of wind turbines.
The rapid global deployment of electric vehicle DC fast-charging stations has created a new and fast-growing market for flexible braided copper wire. High-power chargers operating at 350 kW or above require dedicated medium-voltage transformers with internal connections capable of handling high-frequency switching transients from the power electronics. Flexible braided copper wire provides the low-inductance, high-current connections needed between transformer secondary windings and rectifier assemblies, while its flexibility facilitates the compact, modular designs preferred by charging station manufacturers.
Innovation is reshaping how flexible braided copper wire is designed, manufactured, and deployed in transformer applications.
Advanced surface treatments — including nano-scale silver plating and graphene-enhanced coatings — are being developed to further reduce contact resistance and improve corrosion resistance in extreme environments. These technologies are particularly relevant for HVDC and offshore wind applications where long-term reliability is paramount.
Environmental regulations are driving manufacturers to adopt closed-loop water systems, energy-efficient annealing furnaces, and recyclable packaging. ISO 14001-certified facilities like Xingma are leading the transition to greener copper wire production, reducing carbon footprint without compromising product performance.
Industry 4.0 technologies — including AI-powered visual inspection systems, real-time process monitoring, and automated dimensional measurement — are being integrated into braided copper wire production lines. These systems detect micro-defects invisible to the human eye, ensuring consistent quality for safety-critical transformer applications.
Transformer OEMs increasingly demand fully customized flexible connections — specific cross-sections, termination styles, insulation materials, and shielding configurations. Leading suppliers now offer rapid prototyping services with lead times measured in days, enabling faster transformer development cycles and reducing time-to-market for new designs.
As power densities in transformers continue to increase — driven by the need for compact, lightweight designs in mobile and offshore applications — flexible braided copper wire is being engineered with higher strand counts and optimized braid geometries to achieve current densities previously only possible with solid copper busbars.
The post-pandemic restructuring of global supply chains has accelerated the integration of Chinese copper wire manufacturers into international transformer supply chains. Companies like Xingma, with ISO 9001 certification and proven export track records, are increasingly specified by European and North American transformer OEMs as reliable, cost-competitive suppliers.
Zhejiang Xingma Co., Ltd. was established in 2019 and is located in Liushi, the capital of electrical appliances in China. It is an enterprise mainly engaged in metal products, wire and cable processing and sales; import and export of goods and technology. The company revolves around the construction of a modern enterprise mechanism and mass production of mechanical automation.
The leading products include copper wire, copper braided wire, copper stranded wire, soft copper stranded wire, brush wire, carbon brush wire, soft connection series products, metal stamping parts and other products — best-selling at home and abroad, deeply trusted and welcomed by customers worldwide.
The company abides by the Universal Declaration of Human Rights and major United Nations conventions, respects human and labor rights, and is committed to scientific and technological innovation. Relying on the manufacturing industry, Xingma vigorously expands related industries and continues to develop and grow.
Zhejiang Xingma's state-of-the-art facility ensures every flexible braided copper wire meets the highest standards for high-voltage transformer applications.
A modern production facility with over 10,000 square meters of floor space, equipped with advanced manufacturing and testing infrastructure.
Including Dingtian wire drawing machines, Fuchuan beam machines, pipe twisting machines, braiding machines, annealing furnaces, and automated cutting systems.
Microscope hardness testers, automatic punching machines, 160-ton stamping presses, wire dividing machines, and large polishing systems ensure zero-defect output.
A dedicated team of over 100 professionals, including engineers, quality inspectors, and production specialists with deep expertise in copper wire manufacturing.
Annual production capacity exceeding 2,000 tons, enabling reliable supply for large-scale transformer projects and global OEM customers.
Experienced in international logistics, customs documentation, and compliance with international electrical standards including IEC, UL, and RoHS requirements.
Zhejiang Xingma Copper Industry Co., Ltd. has a factory building with a construction area of more than 10,000 square meters and more than 100 employees. It has more than 300 domestic top-level manufacturing machines, the main equipment includes: Dingtian wire drawing machine, Fuchuan beam machine, pipe twisting machine, braiding machine, annealing furnace, middle drawing machine, automatic cutting machine, welding machine, air dryer, microscope hardness tester, automatic punching machine, 160-ton punching machine, wire dividing machine, flattening machine, large polishing machine, stamping parts cleaning machine, bench drill, packing machine, etc., with an annual production capacity of more than 2,000 tons.
The company abides by the Universal Declaration of Human Rights and major United Nations conventions, respects human and labor rights, opposes discrimination and harassment, respects each other, and is brave and determined to achieve and surpass itself. Relying on the manufacturing industry and taking scientific and technological innovation as the concept, we will vigorously expand related industries and gradually develop and expand. Passed ISO9001 quality system certification and ISO14001 environmental management system certification in 2020. In 2021, it won the star enterprise and excellent production enterprise. It is a member unit of Zhejiang Cable Accessories Industry Association and a member unit of China Forging Association.
Full-spectrum flexible braided and stranded copper wire solutions for high-voltage transformer connections and beyond.
