Method of supplying electric power from shore to ship and system thereof

1. A method of supplying electric power from shore to a ship with at least one generator, the ship being berthed in port, comprising:

a first step of synchronizing the electric power from shore with electric power from the generator,

a second step of carrying out temporary parallel operation of the electric power from shore and the electric power from the generator after the synchronizing of the first step, and

a third step of shutting off the electric power from the generator to supply the electric power from shore to the ship after the temporary parallel operation of the second step,

wherein the ship is provided with cargo-handling equipment requiring a large capacity of electric power and being usually supplied with the electric power from the generator, and a line of the electric power from shore is divided into a second line and a first line, the second line being used to supply the electric power from shore to the cargo-handling equipment, the first line being used to supply the electric power from shore to ordinary load other than the cargo-handling equipment, the method further comprising:

a first process of supplying the electric power from shore to the cargo-handling equipment by connecting the second line to the cargo-handling equipment after shutting off the electric power from the generator to the cargo-handling equipment, and

a second process of supplying the electric power from shore to the ordinary load via the first line by carrying out the first step to the third step.

2. A method of supplying electric power from shore to a ship according to claim 1 , the ship being provided with not only the cargo-handling equipment and the ordinary load but also propulsion auxiliary equipment requiring a large capacity of electric power,

wherein supply of the electric power from shore to the ordinary load of the ship via the first line is carried out by using a part or a whole of a power line for the propulsion auxiliary equipment.

3. A system for supplying electric power from shore to a ship being berthed in port, the ship being provided with not only ordinary load including onboard lighting equipment and electronic devices supplied with electric power from an onboard generator but also propulsion auxiliary equipment and cargo-handling equipment both requiring a large capacity of electric power, comprising:

an electric power-receiving switchboard receiving the electric power from shore, the electric power-receiving switchboard including circuit breakers being respectively connected to divided first and second lines for turning on and off the electric power from shore to the first and second lines;

a first switchboard operable to change over from the first line to a power line for the propulsion auxiliary equipment by using a first changeover switch;

a second switchboard operable to change over from the second line to a power line for the cargo-handling equipment by using a second changeover switch; and

switching devices including a first circuit breaker and a second circuit breaker, the first circuit breaker closing after synchronization of the electric power from the generator and the electric power from shore transmitted via the power line for the propulsion auxiliary equipment, the second circuit breaker opening to shut off the electric power from the generator to the ordinary load via a main bus bar after temporary parallel operation of the electric power from shore and the electric power from the generator.

4. A system for supplying electric power from shore to a ship according to claim 3 , wherein the switching devices are provided in an onboard main switchboard or in a switchboard located adjacent to the main switchboard.