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Whenever a marine vessel is connected to AC shore power, a galvanic circuit, which can cause corrosion of the vessel and its drive system components, is estab- lished. Anytime there is a direct bond between dissimilar metals in an electrolyte, a galvanic corrosion cell is established. In this application, the direct bond is the grounding conductor in the ship-to-shore power cable, the electrolyte is earth and water, and the metals in the marina and marina electrical grounding system are normally different than the metals in a boat. This can be done one of two ways. A decoupling device can be installed by the marina or port operator on the shore side of the circuit or it can be installed on the vessel by the owner. Either installation location will prevent the flow of corrosion-causing galvanic current while retaining the safety features of the grounding conductor, provided an appropriately rated and certified decoupling device is used. The major limitations of these predecessor products is that they could not be certified as meeting the requirements of an effective grounding path due to their “fail open” failure mode and the need for routine maintenance. The PCR is a certified, maintenance-free device used extensively in the corrosion protection industry where it is often necessary to provide simultaneous DC isolation and AC coupling (or grounding). DC Blocking Voltage Rating For this application, either the standard PCR with an asymmetrical blocking voltage rating of -3/+1 volt or the optional symmetrical PCR with a blocking voltage of -/+2 volts is acceptable. The preferred method is to select a fault current rating based on the circuit breaker clearing curve, for the circuit of interest. Select a product rating in which the product fault current capability for a given time exceeds the current/time clearing curve for the breaker. Contact DEI if you would like assistance with this method.
Tags : electrical grounding system, galvanic corrosion, dissimilar metals, corrosion protection, failure mode, port operator, marine vessel, installation location, electrolyte, power cable, circuit breaker, routine maintenance, safety features, preferred method, asymmetrical
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