Shore power supply system for ships and power supply method thereof

Abstract

The invention discloses a shore power supply system for ships and a power supply method thereof. The shore power supply system comprises a transformer, power load for land, and power load for ships, wherein the low-voltage side of the transformer is grounded through a grounded circuit breaker and a grounded impedance which are connected in parallel; the power load for land and the power load for ships are connected in parallel and are connected with the low-voltage side of the transformer; a circuit breaker of the power load for land is arranged between the power load for land and the transformer; a circuit breaker of the power load for ships is arranged between the power load for ships and the transformer; and the grounded circuit breaker and the circuit breaker of the power load for land are interlocked. When no ship pulls in the shore to use the shore power supply system, the grounded circuit breaker is switched on, so that the grounded impedance is in short circuit, and the shore power supply system supplies power to the power load for land; and when a ship pulls in the shore to use the shore power supply system, the circuit breaker of the power load for ships is switched on, the grounded circuit breaker is switched off, the shore power supply system is grounded through the grounded impedance, and the power load for land and the power load for ships share the same shore power supply system. The shore power supply system has the advantages of rapid switch of power supply modes, reliable work, comprehensive protection means, and capacity of improving the utilization efficiency and working security and stability of the shore power supply system.

Description

technical field

[0001] The invention belongs to the technical field of electric power, relates to ship shore power technology, and relates to a ship shore power system and a power supply method thereof. Background technique

[0002] Ship shore power technology is a power supply technology used when ships are docked. At present, ship shore power technology generally adopts the method of separately setting up a neutral point ungrounded IT system for ship power consumption, or cutting off the land load when the ship is docked, and using the land use neutral point grounded TN system to supply power to the ship. Although the first method is reliable, when the ship is not docked, the shore power system is idle, causing great waste; although the second method is economical, when the ship is docked for power consumption, the power consumption of land loads The system will stop working, and because the shore power system adopts the neutral point directly grounded TN system, once the...

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