Cathodic Protection Transformer Rectifier
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.
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.
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.
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.
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 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.
Features and Benefits
|Types Of Unit||Natural/Forced Air Cooled, Oil Cooled | Indoor or Outdoor type.|
|Control Element||The DC Output will be controlled through latest solid state Silicon Controlled Rectifiers (SCRs) with plug in type control card of electronic circuits.|
|AC Inputs||Single phase or three phase, 50 Hz/ 60 Hz|
|DC Outputs||DC output Voltage - Upto 200V
DC output Current - Upto 500A
|Meters||48 x 96 mm, 3 ½ Digit Digital meters as under
|Indications||Mains ON , Auto Mode , Manual Mode , Auto Ref. mode , CVCC mode , under protection, Over protection , All Ref. Fail , Current Limit.|
|Protection||Normally we provide following protections
|Operational Climatic condition||TRUs are designed to work under severe environmental conditions with ambient temperature of 50 ° C and humidity of 95 % (non condensing). Enclosure confirming to class IP 55 degree of protection.|
|Enclosures||Enclosures are fabricated from 2.5 mm/2.0mm/1.5 mm CRCA sheet and confirming to IP55 degree of protection. Stainless Steel Cabinets for corrosive atmosphere. Lockable doors shall be provided in the Front and Back. Polycarbonate window is provided viewing meters and indications.|
|Finish||Powder coating /Paint of required shade and thickness with proper treatment to suit corrosive/site conditions.|
Following additional features can be provided as per Specifications along with Rectifiers
The Interrupter timer is used for carrying out ON/OFF CP survey using the current interruption technique.
- Stand Alone Interrupter Timer
- GPS synchronizable Interrupter Timer
SCADA Monitoring Facility
Isolated 4- 20 m A are provided for DC output voltage, DC output current and pipe to soil potential (PSP)
Remote Monitoring through GSM Data Logger
The parameters values can be remotely monitored using the GSM based remote monitoring systems
Multichannel TRU as per requirements
Optimizing space and size of the TRU for varied outputs.