Isolation transformers

Isolation transformers

Isolation transformers with a voltage ratio of 230/230 V enable galvanic isolation of the 230 V vehicle electrical system from the mains power supply. If a 115 V vehicle electrical system is to be operated with 230 V mains voltage, a voltage ratio of 115/230 V is required. With an input voltage switch, a 230 V vehicle electrical system can be operated with either 115 V or 230 V mains voltage.

Galvanic corrosion (electrolysis)

When two different metals are in the same electrolyte, an electrical voltage arises between them due to their different electrochemical potentials (electrochemical series). If the two metals are connected, a current flows (reverse electrolysis), which continues until the metal with the lower potential is consumed. A potential hazard is the shore power connection on yachts with metal hulls, as the protective earth conductor on the boat is grounded. If an aluminum yacht is moored next to a steel sheet pile wall or another steel yacht, the galvanic circuit is also completed. This circuit can only be broken by disconnecting the protective earth connection on the boat. To ensure electrical safety, an isolation transformer must be installed. This isolates the hull from the shore power potential. On the secondary side, a new electrical network isolated from the shore power (TN system) with a downstream residual current device (RCD) is established. This prevents corrosion of the propulsion system, even on fiberglass boats.