Cathodic protection is a proven method for extending the service life of metallic infrastructures in corrosive environments. While the CP system is essential for protection, the current interrupter is a key inspection tool used to accurately evaluate and verify system performance. This article provides detailed technical guidance on how to select the ideal current interrupter, considering technical, regulatory and industry best practices.

Why is the Current Interrupter Important in CP Inspections?

A current interrupter is used temporarily during inspection or survey activities to control and measure the electric current in a cathodic protection system. Using the correct interrupter is critical for:

• Reliable “on” and “off” potential measurements

• Compliance with technical standards and best practices

• Ensuring inspection data supports sound integrity decisions

According to AMPP, correct evaluation of CP systems can reduce corrosion-related costs by up to 25%. Efficient use of high-quality interrupters helps extend asset life and supports optimal maintenance strategies.

Key Criteria for Selecting the Right Current Interrupter

1. Current Flow Analysis: It should be able to evaluate the current of the system protecting the structure, considering factors such as the area to be protected, soil resistivity and type of anode.
2. Load Capacity: The breaker must handle the maximum expected load. This involves knowing the technical specifications of the system and making accurate calculations of the currents involved.
3. Operational Efficiency: Optimization of energy consumption and ease of integration with other systems.
4. Brand Compatibility: Synchronization with equipment from different manufacturers. Interoperability with existing systems.
5. Environmental Durability: The location of the system may influence the current interrupter selection. In corrosive or extreme environments, materials and designs that offer greater resistance should be chosen.
6. Ease of Use & Maintenance: A design that allows easy access for maintenance can reduce long-term costs and minimize downtime.
7. Cost-benefit: Analyzes the return on investment, verifies the percentage reduction in long-term operating costs, warranty and technical support.
8. Regulatory Compliance: Ensure that the current interrupter complies with relevant standards such as those set by NACE SP0169, API and ISO, thus ensuring reliability, quality and safety.

Selecting the right current interrupter to evaluate a cathodic protection system not only ensures its effectiveness, but also protects significant infrastructure investments. By considering factors such as durability, efficiency and regulatory compliance, engineers and managers can make informed decisions that will benefit their projects over the long term.

Why Choose TECNA Current Interrupter?

The TECNA GPS Current Interrupter is engineered specifically for demanding field inspections. It stands out for:

• Durability and energy efficiency

• Advanced GPS synchronization

• Compatibility with major CP systems

• Full compliance with industry standards

“Accurate inspection starts with the right interrupter.”

To learn more or request a personalized demonstration, see TECNA Interrupter or contact us directly.

References:

• NACE International. “Corrosion Prevention and Control.” [NACE](https://www.nace.com).
• API Standards for Cathodic Protection Systems.
• Tecna ICE. “Cathodic Protection Explained.” [Tecna ICE](https://tecna-ice.com/la-proteccion-catodica-explicada/).
• https://ru.dgb.unam.mx/bitstream/20.500.14330/TES01000757219/3/0757219.pdf
• https://inspenet.com/articulo/proteccion-catodica-por-corriente-pulsada/
• https://tecna-ice.com/la-proteccion-catodica-explicada/
• https://www.insercor.com/suministros-proteccion-catodica/
• https://repositorio.uptc.edu.co/bitstream/001/8422/3/Sistema_proteccion_catodica.pdf
• https://cimav.repositorioinstitucional.mx/jspui/bitstream/1004/670/1/Tesis%20Miriam%20Terrazas%20Guzm%C3%A1n.pdf
• https://www.redalyc.org/journal/4455/445559634006/html/