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Explore our high-performance copper conductors specifically designed to meet the rigorous demands of transformer terminals, tap changers, and grounding networks.
In high-voltage electrical engineering, not all copper is created equal. "Dead soft" copper refers to copper that has undergone a comprehensive thermal annealing process. Annealing heats the cold-worked copper wire above its recrystallization temperature, typically between 300°C and 650°C, and then cools it slowly. This metallurgical process relieves internal stresses, increases ductility, and restores the maximum electrical conductivity of the material, often exceeding 100% IACS (International Annealed Copper Standard).
For high-voltage transformer connections, this extreme ductility is not just a convenience—it is a critical mechanical requirement. Transformers operate under continuous electromagnetic forces, thermal cycling, and physical vibrations. Hard-drawn or semi-hard copper is prone to work-hardening and subsequent stress-corrosion cracking under these conditions. Dead soft copper wire, however, easily absorbs these dynamic forces without degrading, ensuring a lifetime of safe, uninterrupted operation.
Maximum Conductivity: Minimizes resistive (I²R) losses, reducing heat generation inside the transformer tank.
Superior Bendability: Allows for tight-radius bends in compact cable boxes and tap-changer enclosures without cracking.
Vibration Dampening: Absorbs the constant 50/60 Hz magnetostrictive hum and external grid shocks, preventing fatigue failures at terminal connections.
Enhanced Solderability & Welding: The clean, oxide-free surface of annealed copper ensures reliable brazed, crimped, or welded terminations.
The modernization of global power grids demands transformers that can handle bidirectional power flows from renewable energy sources like wind and solar. These rapid load fluctuations create thermal stresses that standard connections cannot withstand. Modern transformer designs increasingly rely on custom-engineered dead soft copper braided flat wires and flexible busbars to maintain stable connections under extreme temperature swings.
As transmission voltages climb to 800kV AC/DC and beyond, the margins for error shrink to zero. High-voltage transformers require connections that minimize corona discharge, withstand intense short-circuit forces, and fit within optimized insulation footprints. Dead soft copper stranded and braided wires provide the necessary flexibility to route around complex barrier systems while maintaining optimal dielectric clearances.
Furthermore, the industry is witnessing a shift towards tinned and silver-plated copper conductors. Tinning protects the underlying copper from oxidation caused by contact with corrosive transformer oils or atmospheric moisture, extending the operational life of the transformer to 40 years or more.
From heavy industrial switchgear to cutting-edge electric vehicle infrastructure, our flexible copper connectors provide reliable power paths across diverse demanding environments.
Established in 2019, Zhejiang Xingma Copper Industry Co., Ltd. is located in Liushi, the capital of electrical appliances in China. We specialize in the processing, manufacturing, and global sales of premium metal products, wire, and cable assemblies. Our core product portfolio includes copper wire, copper braided wire, copper stranded wire, soft copper stranded wire, brush wire, carbon brush wire, soft connection series products, and metal stamping parts.
Operating out of a modern facility spanning over 10,000 square meters, we employ more than 100 skilled professionals. Our production line is powered by over 300 top-tier domestic manufacturing machines, including Dingtian wire drawing machines, Fuchuan beam machines, pipe twisting machines, braiding machines, annealing furnaces, middle drawing machines, automatic cutting machines, welding machines, air dryers, microscope hardness testers, automatic punching machines, 160-ton punching machines, wire dividing machines, flattening machines, large polishing machines, stamping parts cleaning machines, bench drills, and packing machines. This extensive machinery array enables an annual production capacity exceeding 2,000 tons.
We are fully committed to scientific and technological innovation. In 2020, we successfully passed the ISO9001 quality system certification and the ISO14001 environmental management system certification. Recognized as an excellent production enterprise and a star enterprise in 2021, we are proud members of the Zhejiang Cable Accessories Industry Association and the China Forging Association.
Get answers to common technical questions regarding the selection, installation, and performance of flexible copper conductors in high-voltage transformer connections.
Dead soft copper has been fully annealed, yielding high ductility and minimal mechanical stress. Transformers experience significant magnetic forces and thermal expansion during operation. Hard copper is brittle and prone to stress cracking under these conditions, whereas dead soft copper easily deforms elastically and plastically to accommodate movement without failing.
Yes, positively. Cold working copper (drawing, bending) introduces dislocations and defects into the crystal lattice, which scatter electrons and increase resistance. Annealing removes these internal defects, restoring the copper's crystal structure and maximizing its electrical conductivity to peak levels (typically 100% to 101% IACS).
Tin plating provides a protective barrier against oxidation, moisture, and chemical degradation caused by transformer oils. It ensures excellent long-term contact resistance, prevents galvanic corrosion at connection terminals, and enhances the solderability of the wire ends during assembly.
We maintain strict control over our manufacturing process, utilizing state-of-the-art annealing furnaces and testing equipment like microscope hardness testers. Our products conform to ISO9001 quality management systems, ensuring consistent wire diameter, tensile strength, elongation, and electrical resistance across every batch.
Absolutely. We offer fully customizable solutions, including custom cut-and-weld configurations, various spindle counts for braided designs, custom widths, and specialized stamping parts to match your specific transformer terminal dimensions and layout requirements.
Browse our complete catalog of high-quality copper components, stamping parts, and flexible connecting solutions manufactured to international standards.
