Centrally controlled protection systems having reduced energy let-through mode

• US 20080106838A1
• Filed: 12/26/2007
• Published: 05/08/2008
• Est. Priority Date: 11/30/2005
• Status: Active Grant

• Current Assignee: ABB Schweiz AG (ABB Limited)
• Original Assignee: General Electric Company
• Inventors: Lavoie, Gregory, Hill, Theodore, Sirivella, Anand, Narel, Radoslaw, Valdes, Marcelo, Papallo, Thomas
• Granted Patent: US 7,751,165 B2
• Time in Patent Office: Days
• US Class Current: 361/62
• CPC Class Codes: H02H 3/006 Calibration or setting of parameters
• CPC Class Codes: H02H 7/261 involving signal transmission between at least two stations transmission of signals in general H02H1/0061
• CPC Class Codes: H02H 9/00 Emergency protective circuit arrangements for limiting excess current or voltage without disconnection

Abstract

A centrally controlled protection system is provided. The system includes a plurality of circuit breakers, a plurality of modules, and a central computer. Each of the plurality of breakers are in electrical communication with a respective one of the plurality of modules. The central computer is in communication with each of the plurality of modules via a network. The central computer controls the plurality of circuit breakers in either a normal mode or a reduced energy let-through mode.

Claims

1. A centrally controlled protection system, comprising:

a plurality of circuit breakers;

a plurality of modules, each of said plurality of breakers being in electrical communication with a respective one of said plurality of modules; and

a central computer in communication with each of said plurality of modules via a network, said central computer controlling said plurality of circuit breakers in either a normal mode or a reduced energy let-through mode.

2. The centrally controlled protection system as in claim 1, wherein said central computer performs all primary power distribution functions in said normal mode and said reduced energy let-through mode.

3. The centrally controlled protection system as in claim 2, wherein said primary power distribution functions comprises functions selected from the group consisting of instantaneous overcurrent protection, short time overcurrent, longtime overcurrent, relay protection, logic control, and any combinations thereof.

4. The centrally controlled protection system as in claim 1, wherein said central computer operates in said normal mode until forced to said reduced energy let-through mode by an operator.

5. The centrally controlled protection system as in claim 1, wherein said reduced energy let-through mode comprises at least one parameter that lets reduced energy through said plurality of breakers as compared to said normal mode.

6. The centrally controlled protection system as in claim 5, wherein said at least one parameter is selected from the group consisting of primary pickup currents, primary time delays, a time delta, and any combinations thereof.

7. The centrally controlled protection system as in claim 1, wherein said plurality of circuit breakers are arranged in a tiered power distribution system or a non-tiered power distribution system.

8. The centrally controlled protection system as in claim 1, wherein said plurality of circuit breakers are arranged in a plurality of protection zones.

9. A centrally controlled protection system, comprising:

a plurality of main breakers at a first level of a power distribution system;

a plurality of tie-breakers at a second level of the power distribution system;

a plurality of feeder breakers at a third level of the power distribution system, said plurality of main, tie, and feeder breakers being divided into a plurality of zones of protection;

a plurality of modules, each of said plurality of main, tie, and feeder breakers being in electrical communication with a respective one of said plurality of modules;

a central computer in communication with each of said plurality of modules via a network so that said central computer controls said plurality of main, tie, and feeder breakers;

a plurality of normal settings groups resident in said central computer based upon a state of said main, tie, and feeder breakers within each respective zone of protection; and

a forced settings group resident in said central computer, said forced settings group comprising at least one parameter adjusted, with respect to parameters of said plurality of normal settings groups, to reduce energy let-though said respective zone of protection.

10. The centrally controlled protection system as in claim 9, wherein said at least one parameter in said forced settings group comprises a parameter selected from the group consisting a first pickup current, a first time delay, a second pickup current, a second time delay, a time delta and any combinations thereof.

11. The centrally controlled protection system as in claim 9, wherein said central computer performs all primary power distribution functions for said plurality of main, tie, and feeder breakers.

12. The centrally controlled protection system as in claim 11, wherein said primary power distribution functions comprises functions selected from the group consisting of instantaneous overcurrent protection, short time overcurrent, longtime overcurrent, relay protection, logic control, and any combinations thereof.

13. The centrally controlled protection system as in claim 11, wherein said central computer performs said primary power distribution functions for said plurality of main, tie, and feeder breakers based on said plurality of normal settings groups until forced to use said forced of settings group by an operator.

14. The centrally controlled protection system as in claim 9, wherein said central computer operates in a normal mode using said plurality of normal settings groups and in a reduced energy let-through mode using said forced settings group.

15. A method of controlling a centrally controlled protection system, comprising:

using a central controller to control a plurality of circuit breakers by automatically selecting from a plurality of normal settings groups based on a state of said plurality of circuit breakers; and

forcing said central computer to control at least one of said plurality of circuit breakers using a forced settings group, said forced settings group having at least one parameter for reducing energy let as compared to said normal settings groups.

16. A method of controlling a centrally controlled protection system, comprising:

using a central controller to control a plurality of circuit breakers in a first zone of protection by automatically selecting from a plurality of normal settings groups based on a state of said plurality of circuit breakers in said first zone of protection; and

forcing said central computer to control said plurality of circuit breakers in said first zone of protection using a forced settings group, said forced settings group having at least one parameter for reducing energy let through said zone of protection as compared to said normal settings groups.

17. The method as in claim 16, wherein said at least one parameter comprises a parameter selected from the group consisting a first pickup current, a first time delay, a second pickup current, a second time delay, a time delta and any combinations thereof.

18. The method as in claim 16, wherein forcing said central computer to control said plurality of circuit breakers in said first zone of protection using said forced settings group comprises:

selecting a reduced energy let-through mode for said first zone of protection from an interface in communication with said central computer.