Solid-State Decoupler (SSD)

—— Practical Application ——

1. Electrical Equipment Grounding System Decoupling
   The cathodic protection systems, which are commonly applied on buried pipelines, underground storage tanks or other metallic structures, prevent galvanic corrosion by applying a low voltage negative DC bias to the structure. However, required safety grounding systems connected to the structure short this CP current to ground and may compromise the efficiency of the CP system.Installed between the protected structure and the grounding system, our solid state decoupler isolate or block the flow of DC current to the grounding system or other equipment, thereby eliminating any negative influence on your CP system caused by the grounding materials or neighboring equipment.
2. Insulated Joint Over-voltage Protection
   Isolation joints often need over-voltage protection against lightning and AC fault current, and in some cases, steady-state induced AC voltage. The AC fault current generated by a failure of nearby equipment can be transmitted through a pipeline, endangering personnel or causing damage. When an AC fault occurs, our solid state decoupler instantly conducts fault current to ground, taking the AC current away from the pipeline for immediate protection.
3. Lightning Protection
   When a lightning strike occurs, it presents a safety hazard to personnel and pose a risk to nearby pipelines. The solid state decoupler behaves in the same way as it does during an AC fault. It channels the high voltage DC current of the lightning to ground, safely protecting nearby workers and the pipeline. As soon as this event has ended, the solid state decoupler automatically switches back to its DC isolation mode.
4. AC Voltage Mitigation
   Many pipelines are usually buried along a shared right-of-way with overhead high-voltage power lines, inducing AC current in the pipeline. It normally causes corrosion and related issues. Our solid state decoupler can collapse the steady-state voltage between the connection points to a negligible level by continuously conducting induced AC current to ground, while simultaneously leaving your cathodic protection system unaffected.