HIRECT make Cathodic Protection Transformer Rectifier unit (TRUs) comprise of Automatic, Manual & CVCC controlled. CP-TRU is used for cathodic protection of buried pipelines across the country,storage tanks at terminals /refineries and other buried structures.

Applications

TRUs are used to prevent submerged (Soil or water) metallic structures from corrosion. All submerged Pipelines (Oil, water etc.), concrete structure of bridges/ buildings / sea ports etc can be protected from corrosion by doing CP.

TRUs impress DC Currents in to the Carbon-steel/steel structure to be protected in opposite direction to the galvanic corrosion currents & protects the structure from corrosion.

To obtain the optimum level of protection under varying conditions, it is necessary to vary the impressed current continuously so as to maintain a constant level of protective potential at the structure. This continuous monitoring and control can be achieved by providing an automatic control for the cathodic protection system.

HIRECT offers several types of TRU which are designed, manufactured and tested under strict quality assurance system to achieve highest quality standards.

Transformer

All the Transformers used in TRUs are designed to give high efficiency with low loss. The coils are wound with high conductivity, annealed, insulated electrolytic copper and core material is high permeability, low loss CRGO/CRNGO. The insulation material used is of high standard Class F. Designed and tested as per IEC 76/IS 2026 standards.

Rectifier

Rectifiers are based on internal quality standards and our own make Diodes / Silicon Controlled Rectifiers. Rectifier circuits have different topology depending upon the load requirements.

Designed and tested as per IEC146/IS 3136 standards.

Modes of Operation
Auto Reference Mode

The operation of the TRUs in this mode will be fully Automatic and will be controlled by reference electrode feedback.The unit will automatically maintain reference voltage or P.S.P. within ± 15 mv of the set value under all conditions.

Manual Mode

The DC output voltage of TRU will be controlled in 24 symmetrical steps by means of a separate Autotransformer with Coarse & Fine tapping.

CVCC Mode

The unit will be operated in Constant Voltage or Constant Current mode.

In constant voltage mode the DC output voltage will be settable from 0 to rated value in stepless manner by means of voltage adjustable pot.

In constant current mode the DC output current will be settable from 0 to rated value in stepless manner by means of current adjustable pot.