IP54 Cathodic Protection Rectifier for Pipelines, Ships, Desert and Harsh Environment

Switch mode rectifiers for cathodic protection Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. A simple method of protection connects the metal to be protected to a more easily corroded...

Product Details

IP54 Cathodic Protection Rectifier 

for Pipelines, Ships, Desert and Harsh Environment


1. Switch mode rectifiers for cathodic protection

Cathodic protection (CP) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. A simple method of protection connects the metal to be protected to a more easily corroded "sacrificial metal" to act as the anode. The sacrificial metal then corrodes instead of the protected metal. For structures such as long pipelines, where passive galvanic cathodic protection is not adequate, an external DC electrical power source is used to provide sufficient current.

Cathodic protection systems protect a wide range of metallic structures in various environments. Common applications are: steel water or fuel pipelines and steel storage tanks such as home water heaters; steel pier piles; ship and boat hulls; offshore oil platforms and onshore oil well casings; offshore wind farm foundations and metal reinforcement bars in concrete buildings and structures. Another common application is in galvanized steel, in which a sacrificial coating of zinc on steel parts protects them from rust.


2. Why Green Power's switch mode power supplies replace SCR rectifier?
Green Power's Switch mode power supplies have many advantages over SCR rectifier, therefore, they are now more and more used for electroplating process to replace SCR rectifier.
The main advantages of Green Power pulse plating rectifiers over thyristor rectifiers include but not limited to:

IGBT rectifier adopts AC-DC-AC-DC topology, 3 phase AC is firstly converted to DC, which has capacitors for energy charging and discharging, it will suppress power fluctuation, so rectifiers don't need bigger capacity than actual use.
SCR rectifier doesn't have energy buffer function, it is affected directly by the grid power fluctuation, so it always keep much extra capacityand increase user's investment cost.

Rectifier for Cathodic Protection Used in Pipelines Ships IP54 in Desert and Harsh Environments.png


3. Comparison chart of the rectifiers


Thyristor rectifier

Green Power
  switchingpower supply

Efficiency

low

high

88% (typ.)

Power factor

bad

high

0.93

Size

big

small

At least 1/2 smaller than SCR type

Weight

heavy

light


Regulation speed

slow

high


Response time to load variation

slow

very high

very high (≈1ms)

Accuracy

acceptable

very high

1/1000 of max current or voltage

Shift phase

yes

no


Parallelability (multi-tower)

very difficult

easy in current and voltage mode


Losses at no load /Vout ON

high

low


Losses at no load /Vout OFF

high

low


Reverse speed

very slow

Fast in both voltage and current mode

fastest in both voltage and current mode


4. Main Technical Parameters of the rectifiers


5. Advantages of the rectifiers

Convenient use and operation

Module structure

Easy remote control by communication

Touch panel operation

Easy and quick fault judge and troubleshooting


Look for IP54 Cathodic Protection Rectifier, for Pipelines, Ships, Desert and Harsh Environment, coming from Green Power Technology, is of high precision, high efficiency and reliable performance, which has already been exported to USA, Germany, India, etc and owned good reputation. Customized service is also available if you need.

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