DC Decouplers and Spark Gaps
These units are perfect to protect your assets from HVAC or HVDC lines or Lightening surges. This is an product of M.C. Miller and ADEE. CGL is distributors in Thailand, both companies. M.C. Miller SSDs&PCRs are made in USA and ADEE PCRs are made in France.
Polarization Cell Replacement (PCR)
PCR is a solid state decoupler devices which conduct once a predetermined voltage has been attained. Once conducting, they maintain the predetermined volt drop across the device. The voltage clamping devices will “soft turn on” as the threshold approaches and have a partial turn on, bleeding more and more current off of the pipeline as the voltage threshold is approached. Once at predetermined threshold, the voltage will be clamped while the conduction will be at maximum.These types of devices can have AC mitigation circuits in parallel to decouple AC steady state interference from overhead powerlines on the pipe to cater for AC voltage below the cathodic protection DC fault threshold level. Once “on”, current flowing through the device will not keep the device conducting if the voltage falls below the predetermined threshold.
Solid State Decoupler (SSD)
A spark gap consists of an arrangement of two conducting electrodes separated by a gap usually filled with a gas such as air, designed to allow an electric spark to pass between the conductors.
In AC mitigation applications, the De-Coupler should provide a continuous conduction path to ground for the AC while preserving the applied Cathodic ProtectionDC and provide over voltage protection when AC & DC rise above a specified predetermined level.
There are a few differences to note, primarily in the fault current range of products offered. The PCR offers 4 fault current ratings: 3.7KA, 5KA, 10KA and 15KA. The SSD range also offers 4 fault current rating options, lower scale. The SSD line offers: 1.2KA, 2KA, 3.7KA and 5KA.