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Smart Cathodic Protection Transformer Rectifier

Cathodic Protection Transforme Rectifier unit (TRU) is a crucial component in safeguarding submerged metallic structures from corrosion.
These structures can include buried pipelines, concrete structures (e.g., bridges buildings, sea ports) and storage tanks at terminals/ refineries.

The primary goal of a TRU is to superimpose direct current (DC) onto the steel structure, opposing the galvanic corrosion currents, thus preserving the structure.

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TRUs are available in various control modes: Auto, Constant Voltage Constant Current (CVCC) and manual control.
To ensure optimal protection, TRUs continuously adjust the impressed current, maintaining a constant protective potential at the structure.
This ongoing monitoring and control are typically automated to maintaineffective cathodic protection.

WORKING PRINCIPAL

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FEATURES AND BENEFITS
1. TYPE OF UNIT
a) Natural Air Cooled
b) Oil Cooled
c) indooe or Outdoor type
2. OPERATIONAL CLIMATIC CONDITION
a) TRUs are designed to work under severe environmental conditions with maximum ambient temperature of 55°C and humidity of 95% (noncondensing). Enclosure confirming to class IP 55 degree of protection
3. TRANSFORMER
a) All the Transformers used in TRUs are designed to give high efficiency giving low loss. The coils are wound with high conductivity, annealed, insulated electrolytic copper and core material is high permeability, low loss CRGO. The insulation material used is of high standard Class H.
4. RECTIFIER
a) Rectifiers are based on international quality standards and reputed make Diodes / Silicon Controlled Rectifiers. Rectifier circuits have different topology depending upon the load requirements.
5. CONTROL ELEMENT
a) The DC Output will be controlled through latest solid state Silicon Controlled Rectifiers (SCRs) with plug in type control card & a specialized industrial minicomputer with programmable logic controller.
6. PROTECTIONT
a) Normally we provide following protections:
1. MCBs with HRC Fuses in AC Input & DC Output
2. Surge protection device (SPD) in AC Input & DC Output
3.Over current limit & short circuit protection through electronic controller Glass cartridge fuses in the all auxiliary power lines to control circuit
7. MODES OF OPERATIONS
a) 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 high precision ± 10 mv of the set value under all conditions
1. Auto reference cell selection Mode: TRU will autonomously prioritize the selection of the lowest reference cell to ensure that all reference cell values remain consistently above the predetermined threshold.
2. Specific Reference selection Mode: The client has the option to manually select any reference cell connected to the TRU and the system prioritizes the chosen reference cell to ensure values consistently exceed the predetermined threshold.
 b) CVCC MODE: The unit will be operated in Constant Voltage or Constant Current mode
1. Smart Control Mode: The DC output voltage and current limit can be precisely set anywhere between 0 and their respective rated values using a touch keyboard input on the HMI.
2. Local Pot Control Mode: DC output voltage & Current limit could be settable from 0 to rated value in high precision stepless manner by means of voltage adjustable pot.
 c) MANUAL MODE: The DC output voltage of the TRU will be precisely and continuously controlled using a separate variable transformer for fine-tuning.
8. ENCLOSURES
a) Enclosures are fabricated from 2.5 mm / 2.0mm / 1.5 mm CRCA sheet and confirming to IP55 degree of protection. Lockable doors shall be provided in the Front and Back. Polycarbonate window is provided viewing HMI parameters and indications.
9. FINISH
a) Powder coating / Paint of required shade and thickness with proper treatment to suit corrosive/site conditions.
10. AC INPUTS
a) Single phase or three phase, 50 Hz/ 60 Hz
11. HUMAN MACHINE INTERFACE (HMI):
A seven-inch touchscreen specialized industrial minicomputer equipped with built-in 4G IIOT and programmable controller capabilities ensures remote accessibility for comprehensive monitoring and control of all parameters from any location as following.
a)Monitoring Parameters.
AC Input Voltage
AC Input current
DC Output Voltage
DC Output Current
Reference cell -1
Reference cell -2
Reference cell -3
Mains ON
a)Controlling Parameters
Auto Ref set (Int PSP)
DC output voltage set
DC Current limit set
Current Interrupter
12. INDICATIONS LAMP
a) Auto b) Manual c) Current Limit
13. ADDITIONAL FEATURES
a) Interrupter Timer: The Interrupter timer is programed in HMI sync with internet server clock used for carrying out ON /OFF CP survey using the current interruption technique.
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