Communication interface for bus connected circuit breakers

• US 5,821,876 A
• Filed: 10/08/1991
• Issued: 10/13/1998
• Est. Priority Date: 10/08/1991
• Status: Expired due to Fees

• Current Assignee: Square D Company (Schneider Electric SE)
• Original Assignee: Square D Company (Schneider Electric SE)
• Inventors: Tessmer, Earl John, Farrington, Ronald Lee, Serbousek, Larry James, Haun, Andy Allen
• Primary Examiner(s): Hofsass, Jeffery
• Assistant Examiner(s): HILL, ANDREW M
• Application Number:
  US07/772,998
• Time in Patent Office: 2,562 Days
• Field of Search: 340/825.17, 340/638, 340/639, 340/825.18, 340/825.22, 340/825.52, 340/310 A, 340/825.5, 340/825.16, 340/310.06, 307/112, 307/113, 307/115, 307/117, 307/131, 307/132 E, 307/38, 307/40, 307/86, 335/14, 361/68, 361/115, 361/171-175, 361/189-191
• US Class Current: 340/3.2
• CPC Class Codes: H02B 1/056 Mounting on plugboards
• CPC Class Codes: H02H 1/0061 concerning transmission of signals transmission of measured quantities or switching orders; sectionalised protection involving signal transmission between at least two stations H02H7/261; comparison of the voltage or current values at two spaced portions of a single system H02H3/28; transferring the output of a sensing member to another variable G01D5/00; electrical measuring arrangements using modulation of electromagnetic waves, e.g. light beams G01R15/24, G01R15/26
• CPC Class Codes: H02H 7/262 involving transmissions of switching or blocking orders
• CPC Class Codes: H02J 13/00012 using an auxiliary transmission line
• CPC Class Codes: H02J 13/00034 the elements or equipment being or involving an electric power substation
• CPC Class Codes: H02J 13/0004 involved in a protection system
• CPC Class Codes: Y02E 60/00 Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
• CPC Class Codes: Y04S 10/20 using protection elements, arrangements or systems

Abstract

The present invention provides a circuit breaker control arrangement that is reliable, accurate and cost-effective to manufacture, install and maintain. This circuit breaker arrangement also provides increased modularity by alleviating the need for installing wires to connect each circuit breaker with the control station. The present invention uses circuit breakers that contain internal control technology for interrupting and establishing an associated current path. At least one coded signal designates each circuit breaker, and a communication bus carries these coded signals to each circuit breaker. Decoding technology located on each circuit breaker determines whether the coded signal corresponds to that circuit breaker. If the coded signal does correspond to that circuit breaker, then the decoding technology responds by sending the appropriate response signal over the communication bus, and the circuit breaker'"'"'s internal control technology either interrupts or establishes the associated current path.

Claims

1. A communication interface system for circuit breakers which are connected to a power bus in a circuit breaker distribution panel, the system comprising:

a plurality of circuit breakers mounted within the circuit breaker distribution panel, wherein each of said circuit breakers is designated by at least one coded signal and each of said circuit breakers includes means for interrupting and establishing an associated current path and includes decoding means for decoding its designated coded signal and returning a response signal;

a data communication bus, arranged adjacent the plurality of circuit breakers and within the distribution panel, for carrying coded signals to and from the associated circuit breaker'"'"'s decoding means; and

a plurality of coupling means, each of said coupling means located within the distribution panel and physically connected to the data communication bus and an associated circuit breaker and arranged for coupling the associated circuit breaker'"'"'s decoding means to the data communication bus.

2. The system according to claim 1, wherein a controller directs the circuit breakers to interrupt and establish the associated current path by transmitting and receiving the designated coded signals.

3. The system according to claim 2, wherein the circuit breaker distribution panel includes means therein for mounting the controller and each of the circuit breakers.

4. The system according to claim 1, wherein each said decoding means sends the response signal on the data communication bus.

5. The system according to claim 1, wherein each said decoding means for decoding and responding to a coded signal is accomplished with a synchronous digital circuit that properly decodes the incoming coded signal and properly transmits a response signal.

6. The system according to claim 1, wherein said data communication bus comprises:

a transmission line for carrying the coded signals to each circuit breaker'"'"'s decoding means; and

a response line for carrying the response signal from the circuit breaker'"'"'s decoding means after receiving the coded signal designated for that circuit breaker.

7. The system according to claim 1, wherein each said coupling means includes optical isolation means.

8. The system according to claim 7, wherein said optical isolation means comprise:

a light-emitting diode (LED) and a receiving photo transistor for data communication bus to circuit breaker transmissions where the LED is connected to the data communication bus and the receiving photo transistor connects to said decoding means for decoding the coded signal; and

an LED and a receiving photo transistor for circuit breaker to data communication bus transmissions where the LED is connected to said decoding means for responding to a designated coded signal and the receiving photo transistor connects to the data communication bus.

9. The system according to claim 7, wherein the data communication bus includes a transmission line for carrying the coded signals to the circuit breakers and the optical isolation coupling means include LED'"'"'s and associated drivers connected at locations along the transmission line where a circuit breaker is optically coupled to the data communication bus;

and

wherein the data communication bus includes a response line for carrying the circuit breaker return response signals and the optical isolation coupling means include photo transistors and associated drivers connected at locations along the response line where a circuit breaker is optically connected to the data communication bus.

10. The system according to claim 7, wherein each said optical isolation means includes:

a first opto-isolation arrangement, located on the associated circuit breaker, for data communication bus to circuit breaker transmission, where the first opto-isolation arrangement includes a photo-receiving component which connects to said decoding means of the associated circuit breaker, and and includes a photo transmitting component which makes contact with the data communication bus; and

a second opto-isolation arrangement, located on the associated circuit breaker, for circuit breaker to data communication bus transmission, where the second opto-isolation arrangement includes a photo-transmitting component which connects to said decoding means of the circuit breaker and includes a photo receiving component which makes contact with the communication bus.

11. The system, according to claim 10, wherein the data communication bus comprises:

a transmission line for carrying coded signals to each decoding means such that the transmission line makes contact with the first opto-isolation arrangement'"'"'s photo transmitting component; and

a response line for carrying a response signal transmitted by a selected one of the decoding means such that the response line makes contact with the associated second opto-isolation arrangement'"'"'s photo receiving component.

12. A circuit breaker arrangement, comprising:

a plurality of mountable circuit breakers wherein each of said circuit breakers is designated by at least one coded signal, includes means for interrupting and establishing an associated current path, and includes decoding means for decoding and the designated coded signal;

a distribution panel having means for mounting each of said mountable circuit breakers within said panel;

a data communication bus for carrying coded signals to and from the said circuit breakers;

a plurality of coupling means, including optical isolation means, for coupling each circuit breaker to the data communication bus, including;

a light-emitting diode (LED) and a receiving photo transistor for data communication bus to circuit breaker transmissions where the LED is connected to the data communication bus and the receiving photo transistor connects to the decoding means for decoding the coded signal,

an LED and a receiving photo transistor for circuit breaker to data communication bus transmissions where the LED is connected to the decoding means for responding to a designated coded signal and the receiving photo transistor connect to the data communications bus.

13. A circuit breaker arrangement, comprising:

a plurality of circuit breakers wherein each of said circuit breakers is designated by at least one coded signal, each of said circuit breakers including means for interrupting and establishing an associated current path and including decoding means for decoding its designated coded signal and for returning a response signal;

a distribution panel having means for mounting each of said circuit breakers within said panel;

a controller, located proximate the distribution panel, for directing said circuit breakers to interrupt and establish the associated current path by serially transmitting and receiving the designated coded signals;

a data communication bus for two-way communication between each decoding means and the controller; and

a plurality of coupling means, including optical isolation means, for coupling each circuit breaker'"'"'s decoding means to the data communication bus.

14. The circuit breaker arrangement, according to claim 13, wherein the controller comprises:

a serial interface with the data communication bus for transmitting coded signals over the data communication bus to the circuit breakers and for receiving the response signals from the circuit breakers;

a means for generating the proper coded signals that are transmitted through the serial interface, over the data communication bus and to the circuit breakers such that the decoding means on each circuit breaker may decode the coded signal; and

a means for sampling the data communication bus for a response signal from the circuit breaker designated by the controller'"'"'s coded signal.

15. The circuit breaker arrangement, according to claim 13, wherein each said decoding means for decoding and responding to the coded signals is accomplished with a synchronous digital circuit that properly decodes the incoming coded signal and properly transmits a response signal.

16. The circuit breaker arrangement, according to claim 13, wherein each said decoding means sends the response signal on the data communication bus.

17. The circuit breaker arrangement, according to claim 13, wherein said optical isolation means comprises:

a light-emitting diode (LED) and a receiving photo transistor for data communication bus to circuit breaker transmissions where the LED is connected to the data communication bus and the receiving photo transistor connects to the decoding means for decoding the coded signal; and

an LED and a receiving photo transistor for circuit breaker to data communication bus transmissions where the LED is connected to said decoding means for responding to a designated coded signal and the receiving photo transistor connects to the data communication bus.