REDARTI RED-T/R Series Cathodic Protection (T/R) Rectifiers are industrial power systems developed to provide uninterrupted protection of buried or submerged metallic structures against electrochemical corrosion using the Impressed Current Cathodic Protection (ICCP) method. By preventing metal dissolution in critical infrastructure such as natural gas pipelines, oil pipelines, storage tank bottoms, jetty piles, ship hulls and reinforcing steel in concrete structures, they maximise structure life.
They are built with air-cooled (A), water-cooled (W) or oil-cooled (O) architectures to suit customer and site conditions. Power control can use tap-changing transformer, column variac, thyristor-controlled or high-frequency MOSFET/IGBT Switch-Mode topologies. Without any power limit, units are manufactured at any required voltage and current — from micro/low-current protection needs to huge plant lines (e.g. 50V-50A, 65V-50A, 100V-100A and custom power ratings).
Depending on operator preference, a digital LCD display, a colour HMI touchscreen or special precision analogue meters (voltmeter/ammeter/reference indicators) can be used. Indoor (IP21/IP31) or outdoor cabinet designs built for harsh field conditions (IP65/IP66 stainless/galvanised, 300 µm oven-baked epoxy coating, field type with rain hood) are available. Our units operate uninterrupted 24/7 in manual, automatic (reference-electrode), interrupted (pulse/ON-OFF) and SCADA/GPS remote-monitoring modes.
The Technical and Electrochemical Importance of Cathodic Protection (ICCP)
Metal pipes and tanks that are buried or submerged react with the surrounding electrolyte, lose electrons at anodic areas and corrode (perforate). The technical solutions provided by cathodic protection rectifiers:
- Making the Metal Structure the Cathode: The rectifier's (+) terminal is connected to the auxiliary anode bed and its (-) terminal to the metal pipe/tank structure to be protected. By continuously impressing direct current (DC) on the metal, the structure's potential is pulled into the negative region and corrosion is stopped 100%.
- Automatic Reference Electrode (Cu/CuSO4 or Ag/AgCl) Regulation: The potential read from the reference electrode is measured in real time and the rectifier output voltage and current are adjusted automatically to the set protection potential (e.g. between -850 mV and -1500 mV). This prevents the risk of over-protection (hydrogen embrittlement) or under-protection.
- Interrupted Operation (Pulse ON-OFF) and GPS Synchronisation Precision: ON-OFF operation adjustable from 0.1 to 99 seconds allows true 'Instant OFF' potential measurement free of the IR-drop effect. With GPS module integration, all rectifiers in the field can be pulsed simultaneously.
Key Features
- Unlimited Power and Flexible Topology: Tap-changing, column variac, thyristor-controlled or IGBT/MOSFET Switch-Mode build options with no power limit.
- Versatile Cooling Architecture: Heavy-duty air-cooled (A), water-cooled (W) or oil-cooled (O) cooling alternatives for each site's conditions.
- Flexible Display and Indicator Options: Digital LCD display, 7-inch TFT HMI colour touch panel or special precision analogue meters, as the user prefers.
- Dedicated Indoor and Outdoor Cabinet Designs: IP65/IP66 stainless-steel panels for outdoor sites with 300 µm oven-baked epoxy coating, ventilation louvres and protective rain hood.
- 4 Operating Modes: Manual mode (CC/CV), automatic mode (reference-electrode regulated), SCADA mode and interrupted (pulse/ON-OFF) mode.
- Advanced Lightning and Field Protection: Class D surge arrester at the mains input, high-voltage gas discharge tube (High Voltage Gas Arrester) at the output, reverse-voltage protection and transient overcurrent protection.
- SCADA and Remote Monitoring Integration: RS485 MODBUS-RTU, isolated 4-20 mA analogue outputs and GPS-clock simultaneous synchronisation support.
Applications
- Pipelines (Oil & Gas Pipelines): Corrosion protection of buried natural gas, crude oil, fuel and drinking water transmission lines.
- Industrial Plants and Storage Tanks: Storage tank bottoms, underground fuel tanks and process piping.
- Marine Structures and Ports: Steel-piled jetties, bulk cargo ports, subsea pipelines and ship hulls.
- Power Plants and Reinforced Concrete Structures: Impressed current protection of cooling water pipes, bridge piers and steel reinforcement in concrete.
