Transformer Rectifier is used for cathodic protection of buried pipelines across the country, storage tanks at terminals /refineries and other buried structures.
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.
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.
MOD 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 within ± 15 mv of the set value under all conditions.
The DC output voltage of TRU will be controlled in 24 symmetrical steps by means of a separate Autotransformer with Coarse & Fine tapping.
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 step less manner by means of voltage adjustable pot.
In constant current mode the DC output current will be settable from 0 to rated value in step less manner by means of current adjustable pot.