초록 ▼

An electrical system architecture has at least two sources of electrical power, each delivering power to an individual AC bus. The individual AC buses are connected by a tie bus. A first source of electric power delivers power into a first AC bus, and the first AC bus delivers power to a first set o

An electrical system architecture has at least two sources of electrical power, each delivering power to an individual AC bus. The individual AC buses are connected by a tie bus. A first source of electric power delivers power into a first AC bus, and the first AC bus delivers power to a first set of users. A supply current sensor is between the first source of power and the first AC bus. A tie bus output sensor senses output power from the AC bus being delivered onto the tie bus. A plurality of user output current sensors sense current passing to each of the plurality of users. A control is operable to compare a sensed current in the supply current sensor, and sum the current in the tie bus output sensor, and the plurality of user output sensors. If the sum of the output sensors differs by more than a predetermined amount from the current sensed by the supply sensor, the control identifies a fault. The first AC bus is then disconnected from the tie bus.

대표청구항 ▼

1. An electrical system architecture comprising: at least two sources of electric power, each of said at least two sources delivering power to an individual AC bus, and said individual AC buses being connected by a tie bus;a first of said sources of power delivering power into a first said individua

1. An electrical system architecture comprising: at least two sources of electric power, each of said at least two sources delivering power to an individual AC bus, and said individual AC buses being connected by a tie bus;a first of said sources of power delivering power into a first said individual AC bus, and said first AC bus for delivering power to a first set of users and a supply current sensor between said first source of power and said first AC bus, a tie bus output current sensor for sensing output current from said first AC bus being delivered onto said tie bus, and a plurality of user output current sensors, with said plurality of user output current sensors sensing current passing to each of said first set of users; anda control operable to compare a sensed current in said supply current sense, and sum the sensed output currents in said tie bus output current sensor, and said plurality of user output current sensors, and if the sum differs by more than a predetermined amount from the sensed current from said supply current sensor, a fault is identified, and said first AC bus being disconnected from said tie bus. 2. The architecture as set forth in claim 1, wherein if a fault is identified on said first AC bus, then a switch is opened between said first source of power and said first AC bus along with opening a switch to disconnect said first AC bus from said tie bus. 3. The architecture as set forth in claim 2, wherein said first source of power is also stopped if a fault is identified on said first AC bus. 4. The architecture as set forth in claim 1, wherein a second of said at least two sources of power is also controlled by said control, said second of said sources of power delivering power into a second said individual AC bus, and said second AC bus for delivering power to a second set of users, and a second supply current sensor between said second source of power and said second AC bus, a second tie bus output current sensor for sensing output current from said second AC bus being delivered onto said tie bus, and a second plurality of user output current sensors, with said plurality of user output current sensors sensing current passing to each of said second set of users, said control operable to compare a sensed current in said second supply current sensor, and sum the sensed output currents in said second tie bus output current sensor, and said second plurality of user current sensors, and if the sum differs by more than a predetermined amount from the sensed current from said second supply current sensor, identifying a fault, and said second AC bus being disconnected from said second tie bus. 5. The architecture as set forth in claim 4, wherein if a fault is identified on said second AC bus, then a switch is opened between said second source of power and said second AC bus along with opening a switch to disconnect said second AC bus from said tie bus. 6. The architecture as set forth in claim 4 wherein said second source of power is also stopped if a fault is determined on said second AC bus. 7. The architecture as set forth in claim 4, wherein said first and second sources of power are gas turbine engines powering variable frequency generators. 8. The architecture as set forth in claim 4, wherein said tie bus also receives power from a third source of power, and there being switches on said tie bus such that said third source of power can be isolated on said tie bus from either of said first and second AC buses. 9. The architecture as set forth in claim 4, wherein said current sensors are all transformers. 10. The architecture as set forth in claim 9, wherein said transformers send a sensed current signal which is proportional to the actual sensed current. 11. The architecture as set forth in claim 4, wherein said each of said first and second AC buses communicate with an essential bus, and a switch disconnecting either of said first and second sources of power from said essential AC bus if a fault is identified on said either of said first and second AC buses. 12. The architecture as set forth in claim 11, wherein said switch for disconnecting either of said first and second AC buses from said essential AC bus is in series with another switch which selectively disconnects both of said first and second AC buses from said essential bus, and connects an emergency generator to said essential AC bus. 13. The architecture as set forth in claim 12, wherein said emergency generator is a ram air turbine. 14. The architecture as set forth in claim 1, wherein said current sensors are all transformers. 15. The architecture as set forth in claim 14, wherein said transformers send a sensed current signal which is proportional to the actual sensed current. 16. An electrical system architecture comprising: at least two sources of electrical power, each of said at least two sources delivering power to an individual AC bus, and said individual AC buses being connected by a tie bus, a first of said sources of power delivering power into a first said individual AC bus, and said first AC bus for delivering power to a first set of users, and a first supply current sensor between said first source of power and said first AC bus, a first tie bus output current sensor for sensing output current from said first AC bus being delivered onto said tie bus, and a first plurality of user output current sensors, with said first plurality of user output current sensors sensing current passing to each of said first set of users;a control operable to compare a sensed current in said first supply current sense, and sum the sensed output currents in said first tie bus output current sensor, and said first plurality of user output current sensors, and if the sum differs by more than a predetermined amount from the sensed current by said first supply current sensor, identifying a fault, and said first AC bus being disconnected from said tie bus;a second of said sources of power delivering power into a second said individual AC bus, and said second AC bus delivering power to a second set of users, and a second supply current sensor between said second source of power and said second AC bus, a second tie bus output current sensor for sensing output current from said second AC bus being delivered onto said tie bus, and a second plurality of user output current sensors, with said second plurality of user output current sensors sensing current passing to each of said second set of users;a control operable to compare a sensed current in said second supply current sense, and sum the sensed output currents in said second tie bus output current sensor, and said second plurality of user current sensors, and if the sum differs by more than a predetermined amount from the sensed current by said second supply current sensor, identify a fault, and said second AC bus being disconnected from said tie bus;and if a fault is identified in either of said first or second AC buses, then a switch being opened between said either of said first and second sources of power and said first or second AC bus;said first and second sources of power being gas turbine engines powering variable frequency generators;said tie bus also receiving power from a third source of power, and there being switches on said tie bus such that said third source of power can be isolated on said tie bus;said current sensors being transformers and said transformers sending a sensed current signal which is proportional to the actual sensed current; andeach of said first and second AC buses communicating with an essential bus, and a switch disconnecting either of said first and second AC buses from said essential AC bus if a fault is identified in said either of said first and second AC buses. 17. The architecture as set forth in claim 16, wherein said switch for disconnecting either of said first and second AC buses from said essential AC bus is in series with another switch which selectively disconnects both of said first and second AC buses from said essential bus, and connects an emergency generator to said essential AC bus. 18. The architecture as set forth in claim 17, wherein said emergency generator is a ram air turbine.