REDARTI RED-TAV Series Conductor and Wire Annealing Rectifiers are high-technology industrial power systems designed to soften the crystalline molecular structure that hardens while wire is drawn and to increase conductivity (annealing) on cable production lines, in wire drawing plants, in enamelled winding wire production and in the metal forming industry. Thanks to current and voltage regulation synchronised with the wire drawing machine's speed to the millisecond, they prevent wire breakage or incomplete annealing 100%.
Our systems are built with 3 flexible cooling options — air-cooled (A), water-cooled (W) or oil-cooled (O) — according to customer requirements and the plant's infrastructure. The power architecture can use a heavy-duty thyristor-controlled (SCR) design or high-frequency IGBT Switch-Mode technology. Without any power limit, they can be custom-built at unlimited kW/kVA and ampere ratings, from the smallest wire drawing machines to huge continuous annealing lines.
For ease of use and process monitoring, configurations with a digital LCD panel or an industrial colour touchscreen (HMI) on a Siemens PLC platform are offered. With a tap-changing transformer (optional) tailored to the diameter, speed and type of wire being drawn, drive-controlled (inverter / speed-synchronised) or drive-less (standard line-synchronised) options are available.
The Technical Importance of Conductor and Wire Annealing
In wire drawing, copper, aluminium or alloy metals are exposed to mechanical stress, harden and lose conductivity. The technical solutions provided by REDARTI Annealing Rectifiers:
- Speed-Matched Line Synchronisation (Drive Control): The rectifier output voltage and current are adjusted instantly to the speed of the wire drawing line. The risk of burning the wire (overheating/breakage) or leaving it hard (insufficient annealing) during line stop-starts or acceleration/deceleration is reduced to zero.
- Improved Molecular Structure and High Conductivity: The electrolytically heated conductor is brought to the required annealing temperature and its stresses are relieved. This achieves high flexibility, fracture resistance and maximum electrical conductivity in full compliance with IEC and TSE standards.
- Flexible Power Architecture and Tap-Changing Transformer Option: For different wire cross-sections (e.g. from 0.10 mm fine wire to 8 mm thick wire rod) and different raw materials (copper, aluminium, brass, etc.), the tap-changing transformer option sets the most efficient operating point.
Key Features
- Unlimited Power and Capacity Builds: Special industrial builds with no power limit, from the lowest currents up to 30,000 A+ and high kW ratings.
- Thyristor or IGBT Control Technology: A heavy-duty thyristor (SCR) or high-frequency IGBT Switch-Mode power stage, depending on process speed and precision requirements.
- Versatile Cooling Architecture: Heavy-duty air-cooled (A), water-cooled (W) or oil-cooled (O) build options that fully match factory operating conditions.
- Drive-Controlled or Drive-Less Builds: Inverter-drive integration for fully synchronised operation with line speed, or drive-less direct control for constant-speed lines.
- Optional Tap-Changing Transformer: A tap-changing transformer design that optimises output voltage and efficiency for plants working across a wide range of wire diameters.
- Manual and Full Automation (PLC/SCADA) Control: Precise manual potentiometer adjustment plus Profinet, Modbus RTU, Ethernet and 0-10V analogue speed-tracking interfaces.
- LCD and Touchscreen (HMI) Interface: A digital LCD panel or a colour touchscreen on a Siemens PLC platform, as the user prefers.
Applications
- Cable Factories and Conductor Plants: Copper and aluminium wire annealing lines for power, low-current, communication and installation cables.
- Continuous Wire Drawing and Annealing Lines: Systems that anneal wire online at high speed at the wire drawing machine's exit.
- Enamelled Winding Wire Plants: Softening processes for the insulated enamelled wire used in transformer and motor windings.
- Wire and Nail Workshops, Metal Forming Industry: Softening and stress-relief plants for spring steel, steel wire, brass wire and special alloy wire.
