Fault protection system for a power system of dynamically positioned vessel

摘要

A fault protection system of a power system of a dynamically positioned vessel is provided. The power system has a power distribution bus having three or more bus subsections, electric connections including bus ties which connect the bus subsections in a ring configuration, and circuit breakers connected between the bus subsections. The fault protection system includes a generator circuit breaker for coupling a generator to a bus subsection, feeder circuit breaker(s) for coupling load(s) to the bus subsection, a first circuit breaker for connecting one end of the bus subsection to a bus tie that provides an electric connection to another bus subsection, the first circuit breaker being a bus tie breaker, a second circuit breaker for coupling another end of the bus subsection to a further bus subsection, protection relays for operating the circuit breakers, and communication links between protection relays that exchange information via said communication links.

主权项

1. A fault protection system of a power system of a dynamically positioned vessel, wherein the power system comprises a power distribution bus comprising three or more bus subsections, electric connections including bus ties which connect the bus subsections in a ring configuration and circuit breakers connected between the bus subsections to break the electric connections, wherein for at least one of said bus subsections, the fault protection system comprising:
a generator circuit breaker for coupling a generator to the bus subsection, one or more feeder circuit breakers for coupling one or more loads to the bus subsection, a first circuit breaker via which a first end of the bus subsection is connected to a bus tie, said bus tie providing the electric connection to another bus subsection in said ring configuration, the first circuit breaker being a bus tie breaker, a second circuit breaker for coupling a second end of the bus subsection to a further bus subsection in said ring configuration, protection relays coupled to the circuit breakers for operating the circuit breakers, communication links between the protection relays, the protection relays being configured to exchange information via said communication links, wherein said protection relays are configured to provide at least:
a generator protection zone including the generator circuit breaker and a generator, the protection relay coupled to the generator circuit breaker being configured to provide a differential protection for the generator,a bus tie protection zone including the bus tie breaker, the bus tie and a further bus tie breaker via which the bus tie is coupled to the other bus subsection, wherein protection relays coupled to the bus tie breakers are configured to provide differential protection for the bus tie, anda bus subsection protection zone including the bus subsection and the circuit breakers coupled to the bus subsection, the protection relays coupled to these circuit breakers being configured to provide a differential protection for the bus subsection.