Computerized electricity system having an arc fault detecting sub-system

• US 7,282,924 B1
• Filed: 06/29/2006
• Issued: 10/16/2007
• Est. Priority Date: 06/29/2006
• Status: Expired due to Fees

• Current Assignee: Target Hi-Tec Electronics Limited
• Original Assignee: Target Hi-Tec Electronics Limited
• Inventors: Wittner, Lupu
• Primary Examiner(s): Deb; Anjan
• Application Number:
  US11/427,345
• Time in Patent Office: 474 Days
• Field of Search: 324/536, 324/522, 361/42, 361/57, 702/58, 702/64, 700/292, 700/293
• US Class Current: 324/536
• CPC Class Codes: H02H 1/0015 Using arc detectors
• CPC Class Codes: H02H 1/0092 concerning the data processing means, e.g. expert systems, neural networks

Abstract

A computerized electricity system for connecting loads to a power source, including: (a) an arc fault detecting sub-system having at least one module including: (i) a relay unit, electrically associated with a particular load, for connecting and disconnecting to a power source; (ii) a current source for measuring a current being delivered from the power source to the load, to produce a current measurement; (iii) an analog circuit for receiving the current measurement from the current sensor, and for producing an analog signal based on the current measurement, and a second signal for indicating a potential arc fault event, and (iv) a digital circuit for receiving the second signal from the analog circuit and producing data, and (b) a processing unit connected to each module, so as to receive data corresponding to the analog signal, and the data from the digital circuit, the processing unit for identifying the arc faults, and wherein the processing unit is configured to command the relay unit to disconnect the current in response to identifying the arc faults, and wherein the processing unit is configured to provide this command only if several pre-determined conditions are met, (I) after detection of the potential arc fault event, the current measurement remains substantially unchanged, and (II) after a detection of at least one addition potential arc fault event, the arc fault events are found to be acyclic.

Claims

1. A computerized electricity system for connecting loads to at least one power source, the computerized electricity system comprising:

(a) an arc fault detecting sub-system for detecting arc faults, said sub-system having at least one module, each said module including;

(i) a relay unit, electrically associated with a particular load of the loads, said relay unit for connecting and disconnecting to a power source of the at least one power source;

(ii) a current sensor for measuring a current being delivered from said power source to the load, so as to produce a current measurement;

(iii) an analog circuit designed and configured to receive said current measurement from said current sensor, and to produce an analog signal based on said current measurement, and a second signal for indicating a potential arc fault event, and

(iv) a digital circuit designed and configured to receive said second signal from said analog circuit, and to produce data, and

(b) a processing unit electrically connected to each said module of said arc fault detecting sub-system, so as to receive data corresponding to said analog signal, and said data from said digital circuit, said processing unit for identifying of said arc faults,

and wherein said processing unit is configured to command said relay unit to disconnect said current in response to said identifying of said arc faults, and wherein said processing unit is configured to provide said command only if several pre-determined conditions are met, said conditions including;

(I) after a detection of said potential arc fault event by said arc fault detecting sub-system, said current measurement remains substantially unchanged, and

(II) after a detection of at least one additional potential arc fault event by said arc fault detecting sub-system, said arc fault events are found to occur in an acyclic fashion.

2. The computerized electricity system of claim 1, said conditions further including:

(III) said potential arc fault event and said at least one additional potential arc fault event occur within a pre-determined amount of time.

3. The computerized electricity system of claim 1, wherein said module is configured to check for a high current overload prior to said detecting of said arc faults.

4. The computerized electricity system of claim 1, wherein said module is configured to measure a low current overload for a period of at least 20 milliseconds, and to only subsequently disconnect said current.

5. The computerized electricity system of claim 1, wherein the computerized system is configured to receive, from a user, an input associated with a particular lag time for disconnecting said current, and wherein said module is configured to measure a low current overload over said particular lag time, prior to said current being disconnected.

6. The computerized electricity system of claim 1, wherein said module is configured to check for current leakage prior to said detecting of said arc faults.

7. The computerized electricity system of claim 2, wherein said pre-determined amount of time is at least 0.3 seconds.

8. The computerized electricity system of claim 2, wherein said pre-determined amount of time is at least 1.0 seconds.

9. The computerized electricity system of claim 2, wherein said pre-determined amount of time is at least 3.0 seconds.

10. The computerized electricity system of claim 2, wherein said pre-determined amount of time is a clock cycle of said processing unit.

11. The computerized electricity system of claim 1, further comprising:

(c) a meter, associated with said power supply and a voltage sensor, for providing voltage information to said processing unit.

12. The computerized electricity system of claim 11, wherein said processing unit is configured to utilize said voltage information in evaluating said change in load.

13. The computerized electricity system of claim 11, wherein said processing unit is configured to utilize said voltage information to neutralize an effect of voltage fluctuation on said change in load.

14. The computerized electricity system of claim 1, wherein said second signal is a digital signal.

15. A computerized electricity system for connecting loads to at least one power source, the computerized electricity system comprising:

an arc fault detecting sub-system for detecting arc faults, said sub-system including;

(a) at least one relay unit, electrically associated with a particular load of the loads, said relay unit for connecting and disconnecting to a power source of the at least one power source;

(b) at least one current sensor for measuring a current being delivered from said power source to the load, so as to produce a current measurement;

(c) a processing unit electrically connected to said relay unit and to said current sensor, said processing unit configured so as to receive a signal corresponding to said current measurement,

and wherein said processing unit is configured to command said relay unit to disconnect said current in response to said detecting of said arc faults,

and wherein said processing unit is configured to provide said command only if several pre-determined conditions are met, said conditions including;

(I) after detection of said potential arc fault event by said processing unit, using said signal, said current measurement is substantially unchanged, and

(II) after detection of at least one additional potential arc fault event by said processing unit, using said signal, said arc fault events are found to occur in an acyclic fashion.

16. The computerized electricity system of claim 15, said conditions further including:

(III) said potential arc fault event and said at least one additional potential arc fault event occur within a pre-determined amount of time.

17. The computerized electricity system of claim 15, wherein said processing unit is configured to disconnect said current after said current measurement indicates a low current overload for a period of at least 20 milliseconds.

18. The computerized electricity system of claim 15, wherein the computerized system is configured to receive, from a user, an input associated with a particular lag time for disconnecting said current, and wherein said processing unit is configured to disconnect said current after said current measurement indicates a low current overload for said particular lag time.

19. The computerized electricity system for connecting loads to at least one power source, the computerized electricity system comprising:

an arc fault detecting sub-system for detecting arc faults, said sub-system including;

(a) at least one relay unit, electrically associated with a particular load of the loads, said relay unit for connecting and disconnecting to a power source of the at least one power source;

(b) at least one current sensor for measuring a current being delivered from said power source to the load, so as to produce a current measurement;

(c) a processing unit electrically connected to said relay unit and to said current sensor, said processing unit configured so as to receive a signal corresponding to said current measurement,

and wherein said processing unit is configured to command said relay unit to disconnect said current in response to said detecting of said arc faults,

and wherein said processing unit is configured to provide said command only if several pre-determined conditions are met, said conditions including;

(I) after detection of said potential arc fault event by said processing unit, using said signal, said current measurement is substantially unchanged, and

(II) after detection of at least one additional potential arc fault event by said processing unit, using said signal, said arc fault events are found to occur within a pre-determined amount of time.

20. The computerized electricity system of claim 19, wherein said pre-determined amount of time is at least 0.3 seconds.