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Isolation transformers are a crucial component in professional marine energy systems. They protect against electrolytic and galvanic corrosion.
Isolation transformers are a crucial component in professional marine energy systems. They protect against electrolytic and galvanic corrosion and provide a fundamental guarantee for a safe and reliable electrical system on board. With advanced toroidal winding technology, these transformers offer quiet operation, low weight, and high efficiency. The integrated soft-start circuit prevents fuses from tripping upon connection, ensuring a smooth and safe startup.
Protection against galvanic corrosion
Galvanic corrosion occurs when two different metals are in electrical contact and simultaneously exposed to a conductive liquid, such as seawater or freshwater. The more active metal corrodes, while the less active one is protected. This phenomenon can quickly destroy sacrificial anodes, propellers, shafts, and other underwater components – regardless of the hull's material. A galvanic isolator is a cost-effective solution that reduces the risk of corrosion in boats with shore power connection. However, the most effective and safest method is to install an isolation transformer.
Function and installation
The isolation transformer breaks all electrical continuity between shore power and the boat's electrical system. Shore power is fed to the primary side of the transformer, while the vessel is connected to the secondary – completely isolated from shore ground. This allows for the correct function of residual current devices and fuses in case of short circuit or current leakage. Connecting only phase and neutral without a ground cable is dangerous, as residual current devices will not function and no fuse will trip in case of a fault. Therefore, it is crucial that the ground conductor is correctly connected – but isolated via the transformer.
For optimal safety, it is recommended that the neutral of the secondary side is connected to protective earth when the boat is on land.
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