How a Decoupling Device Reduces Stray Currents
A solid-state decoupler performs two essential functions in the energy industry. It isolates DC current and ground AC currents. Decoupling devices are a cost-efficient, certified fail-safe solution and are used with cathodically protected pipelines, tanks, and other grounding systems.
A decoupling device prevents galvanic corrosion of a pipeline or metallic structure. Normally these function by applying a low voltage DC bias to the structure, isolating DC current flow to equipment or grounding materials. But the other functions that decoupling devices provide are safety grounding protection from AC faults and lightning.
Overall, to ensure a safe working environment, a solid-state decoupler protects against high voltage of insulating joints, isolates DC currents, and grounds AC currents of cathodically protected structures.
Solid-State Decoupler Features and Benefits
Maintaining an off-state desired range of voltage between pipe and ground and getting rid of stray currents, or the imbalances or wiring flaws in electricity flow via buildings, is what the solid-state decoupler does best.
The basic functions of a solid-state decoupler:
- Cathodic protection
- AC fault protection
- Lightning protection
- Mitigation of induced AC current
The standard features of a solid-state decoupler include a wide DC clamping voltage range and a high steady state DC current drain. Conversely, decoupling devices also feature a 60Hz AC impedance of 0.04 ohms and an AC steady state current 45A at 50 to 60Hz. Types of decoupling devices include 1.2kA | 2kA | 3.7kA | 5kA | 9.5kA.
Other features of a solid-state decoupler include:
- Six DC thresholds to choose from
- Four different sizes
- A submersible depth of up to two meters
- Lightning impulse ratings lightning spark voltage ratings
Benefits of a solid-state decoupler include a safe working environment where required potentials can be maintained and controlled.
Technical benefits of solid-state decoupler include:
- Higher blocking voltage capabilities
- Technically advanced
- Large, steady state current clamping strength
- Lightweight, compact design
Decoupling Device Applications
Decoupling devices are useful in a wide range of applications. Oil and gas transmissions pipelines, tanks and oil facilities, bulk water pipelines, and refinery and petrochemical industries, are some of the industries where decoupling devices shine. They mitigate AC induced voltage while segregating dissimilar metals that need to be AC grounded but also DC isolated.
Looking to convert AC currents to DC currents? See our Cathode Protection Rectifier.