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The Galvanic Isolator for the Marine Vessel Application
Appleby Marine Inc. - One stop full service Marine Electric Company. Serving Southern Ontario 289-439-9525
The Galvanic Isolator for the Marine Vessel Application
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 established. Any time 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 vessel-to-shore power cable; the electrolyte is earth and water; and the metals in the marina or port electrical grounding system are normally different than the metals in the vessel. If adjacent vessels are also connected to the shore power from the same source, then a vessel-to-vessel corrosion cell can also be established since they will be interconnected through a common grounding conductor.
The rate of metal erosion is directly proportional to the magnitude of galvanic current. Typical erosion rates for metals are in the 3.6 to 9 kg of metal per ampere per year. If the galvanic current is confined to a small area or a critical drive component, even a small amount of metal erosion can result in damage costly to repair.
A simple way to eliminate this corrosion causing circuit, while retaining the safety against shock hazards provided by the grounding conductor, is to install a galvanic isolator in series with the grounding conductor of the vessel-to-shore power cable. This interrupts the corrosion causing circuit (by preventing the flow of DC galvanic current) while retaining all of the safety features of the grounding conductor, provided an appropriately rated and certified device is used.
To learn more click here - http://www.ghe.net.nz/articles.html
MARINE GALVANIC ISOLATORS: FITTING OUR HIGH QUALITY ISOLATORS WILL PREVENT ALL DESTRUCTIVE CURRENTS CREATED BY THE USE OF MARINA SHORE POWER ELECTRICS. THIS LOW COST UNIT COULD SAVE £1000,s IN LOST UNDERWATER SKIN FITTINGS & HARDWARE. 02/14/05
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The Button Shack
Laminated Pin Back Buttons
and Magnets. Custom photo buttons and graphic artistry. Ideal for special events
and as family keepsakes.
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Walleyes Inc. Link Pages for Marine Electronics
http://www.walleyesinc.com/links/marineelectronics.html