Electric power supply circuit monitoring systems

• US 4,983,955 A
• Filed: 11/28/1988
• Issued: 01/08/1991
• Est. Priority Date: 11/28/1988
• Status: Expired due to Term

• Current Assignee: Telect Incorporated (Amphenol Corporation)
• Original Assignee: Hendry Mechanical Works (Amphenol Corporation)
• Inventors: Keenan, James J., Ham, Howard M. Jr.
• Primary Examiner(s): Crosland, Donnie L.
• Assistant Examiner(s): Negash, Kinfe-Michael
• Application Number:
  US07/276,959
• Time in Patent Office: 771 Days
• Field of Search: 340/657, 340/661-664, 323/274-277, 324/133, 361/87, 361/93, 361/98, 361/86, 361/90, 361/88
• US Class Current: 340/664
• CPC Class Codes: H02H 3/04 with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned watching of pilot wires H02H1/0084; protection of protective arrangements H02H7/008; indication of the state of electronic switches H03K17/18
• CPC Class Codes: H02H 3/087 for dc applications

Abstract

Monitoring an electric power distribution circuit having a rated load capacity includes continually sensing an intensity of electric power supplied through that circuit. In response to that sensing a first signal indicating when electric power is supplied through that circuit at a predetermined maximum current usage below rated load capacity is provided. A second signal indicating a safe loading condition is provided when the sensed intensity is substantially below that maximum current usage. A third signal is provided when the mentioned intensity is at a value between the safe loading condition and the maximum current usage.

Claims

1. In a method of monitoring an electric power distribution circuit having a rated load capacity, the improvement comprising in combination the steps of:

supplying electric power through said circuit;

continually sensing an intensity of said electric power supplied through said circuit;

electrically providing in response to said sensing a first signal indicating when electric power is supplied through said circuit at a predetermined maximum current usage below rated load capacity; and

electrically providing in response to said sensing a second signal indicating a safe loading condition when said sensed intensity is substantially below said maximum current usage.

6. A method as claimed in claim 1, including the steps of:

testing one of said first and second signals; and

providing after said testing of said one signal an automatic emission of the other of said first and second signals.

7. A method as claimed in claim 1, wherein:

said first signal is provided by emitting light of a first color; and

said second signal is provided by emitting light of a second color different from said first color.

8. A method as claimed in claim 7, including the step of:

flashing an emission of one of said colors.

14. A method as claimed in claim 1, including the steps of:

supplying electric power through said circuit from a power supply;

connecting another circuit having a rated load capacity to said power supply; and

emitting light of a predetermined color when electric power through either of said circuits is at a maximum current usage predetermined for that circuit.

15. A method as claimed in claim 14, including the step of:

emitting light of another predetermined color when said power supply is in an operating condition.

2. In a method of monitoring an electric power distribution circuit having a rated load capacity, the improvement comprising in combination the steps of:

supplying electric power through said circuit;

continually sensing an intensity of said electric power supplied through said circuit;

electrically providing in response to said sensing a first signal indicating when electric power is supplied through said circuit at a predetermined maximum current usage below rated load capacity;

electrically providing in response to said sensing a second signal indicating a safe loading condition when said sensed intensity is substantially below said maximum current usage; and

electrically providing in response to said sensing a third signal indicating when said intensity is at a value between said safe loading condition and said maximum current usage.

3. A method as claimed in claim 2, including the step of:

providing one of said first, second and third signals by alternating another of said first, second and third signals with a remaining one of said first, second and third signals.

4. A method as claimed in claim 2, including the step of:

combining one of said first, second and third signals with another of said first, second and third signals to provide a remaining one of said first, second and third signals.

5. A method as claimed in claim 2, including the steps of:

providing a combined signal by combining one of said first, second and third signals with another of said first, second and third signals; and

providing a remaining one of said first, second and third signals by alternating said combined signal with said one of said first, second and third signals.

9. In a method of monitoring an electric power distribution circuit having a rated load capacity, the improvement comprising in combination the steps of:

supplying electric power through said circuit;

continually sensing an intensity of said electric power supplied through said circuit;

electrically providing in response to said sensing a first signal by emitting light of a first color indicating when electric power is supplied through said circuit at a predetermined maximum current usage below rated load capacity;

electrically providing in response to said sensing a second signal by emitting light of a second color different from said first color indicating a safe loading condition when said sensed intensity is substantially below said maximum current usage; and

emitting light of a third color in response to said sensing when said intensity is at a value between said safe loading condition and said maximum current usage.

10. A method as claimed in claim 9, including the step of:

combining emission of light of one of said first, second and third colors with another of said first, second and third colors to provide a remaining one of said first, second and third colors.

11. A method as claimed in claim 9, including the steps of:

flashing an emission of one of said first, second and third colors; and

flashing an emission of another one of said first, second and third colors.

12. In a method of monitoring an electric power distribution circuit having a rated load capacity, the improvement comprising in combination the steps of:

supplying electric power through said circuit;

continually sensing an intensity of said electric power supplied through said circuit;

electrically providing in response to said sensing a first signal by emitting light of a first color indicating when electric power is supplied through said circuit at a predetermined maximum current usage below rated load capacity;

electrically providing in response to said sensing a second signal by flashing light of a second color indicating a safe loading condition when said sensed intensity is substantially below said maximum current usage; and

combining an emission of said first color and flashing light of a second color when said sensing indicates that said intensity is at a value between said safe loading condition and said maximum current usage.

13. In a method of monitoring an electric power distribution circuit having a rated load capacity, the improvement comprising in combination the steps of:

supplying electric power through said circuit;

continually sensing an intensity of said electric power supplied through said circuit;

electrically providing in response to said sensing a first signal by emitting light of a first color indicating when electric power is supplied through said circuit at a predetermined maximum current usage below rated load capacity;

electrically providing in response to said sensing a second signal by emitting light of a second color different from said first color indicating a safe loading condition when said sensed intensity is substantially below said maximum current usage;

testing an emission of said first color; and

providing after said testing an automatic emission of said second color.

16. In a method of monitoring an electric power distribution circuit having a rated load capacity, the improvement comprising in combination the steps of:

supplying electric power through said circuit;

continually sensing an intensity of said electric power supplied through said circuit;

electrically providing in response to said sensing a first signal indicating when electric power is supplied through said circuit at a predetermined maximum current usage below rated load capacity;

electrically providing in response to said sensing a second signal indicating a safe loading condition when said sensed intensity is substantially below said maximum current usage;

providing an input of said circuit with a first overload current interrupter;

providing an output of said circuit with a second overload current interrupter;

emitting light of a first color when both said first and second overload current interrupters are conduction electric current;

emitting light of a second color when a predetermined one of said first and second overload current interrupters has responded to an overload condition; and

emitting light of a third color when the other one of said first and second overload current interrupters has responded to an overload condition.

17. A method as claimed in claim 16, including the step of:

providing one of said first, second and third colors by combining emission of light of another of said first, second and third colors with a remaining one of said first, second and third colors.

18. In a method of monitoring electric power distribution circuits having rated load capacities, the improvement comprising in combination the steps of:

supplying electric power through said circuits from a power supply;

connecting a polarized relay to said power supply;

energizing through said polarized relay a source for emitting light of one color when said power supply is in an operating condition; and

deenergizing said polarized relay and emitting with said source light of another color when electric power through either of said circuits is at a maximum current usage predetermined for that circuit.

19. In a method of monitoring electric power distribution circuitry having input and output overload current interrupters, the improvement comprising in combination the steps of:

emitting light of a first color when said input and output overload current interrupters are conducting electric current;

emitting light of a second color when any output overload current interrupter has responded to an overload condition; and

emitting light of a third color when any input overload current interrupter has responded to an overload condition.

20. A method as claimed in claim 19, including the step of:

providing one of said first, second and third colors by combining emission of light of another of said first, second and third colors with a remaining one of said first, second and third colors.

21. Apparatus for monitoring an electric power distribution circuit having a rated load capacity, comprising in combination:

first means for continually sensing an intensity of electric power supplied through said circuit;

second means connected to said first means for providing in response to said sensing a first signal indicating when electric power is supplied through said circuit at a predetermined maximum current usage below rated load capacity; and

third means connected to said first means for providing in response to said sensing a second signal indicating a safe loading condition when said sensed intensity is substantially below said maximum current usage.

22. Apparatus as claimed in claim 21, including:

fourth means connected to said sensing means for providing in response to said sensing a third signal indicating when said intensity is at a value between said safe loading condition and said maximum current usage.

23. Apparatus as claimed in claim 22, including:

means connected to said second, third and fourth means for providing one of said first, second and third signals by alternating another of said first, second and third signals with a remaining one of said first, second and third signals.

24. Apparatus as claimed in claim 22, including:

means connected to said second, third and fourth means for combining one of said first, second and third signals with another of said first, second and third signals to provide a remaining one of said first, second and third signals.

25. Apparatus as claimed in claim 22, including:

means connected to said second, third and fourth means for providing a combined signal by combining one of said first, second and third signals with another of said first, second and third signals, and for providing a remaining one of said first, second and third signals by alternating said combined signal with said one of said first, second and third signals.

26. Apparatus as claimed in claim 21, including:

means connected to said first and second means for testing one of said first and second signals, including means for providing after said testing of said one signal an automatic emission of the other of said first and second signals.

27. Apparatus as claimed in claim 21, wherein:

said second means for providing said first signal include means for emitting light of a first color; and

said third means for providing said second signal include means for emitting light of a second color different from said first color.

28. Apparatus as claimed in claim 27, wherein:

one of said second and third means includes means for flashing an emission of one of said colors.

29. Apparatus as claimed in claim 27, including:

fourth means connected to said sensing means for emitting light of a third color in response to said sensing when said intensity is at a value between said safe loading condition and said maximum current usage.

30. Apparatus as claimed in claim 29, including:

means connected to said second, third and fourth means for combining emission of light of one of said first, second and third colors with another of said first, second and third colors to provide a remaining one of said first, second and third colors.

31. Apparatus as claimed in claim 29, wherein:

one of said second and third means includes means for flashing an emission of one of said first, second and third colors, and for flashing an emission of another one of said first, second and third colors.

32. Apparatus as claimed in claim 21, wherein:

said second means for providing said first signal include means for emitting light of a first color;

said third means for providing said second signal include means for a flashing light of a second color; and

said fourth means include means for combining an emission of said first color and flashing light of a second color when said sensing indicates that said intensity is at a value between said safe loading condition and said maximum current usage.

33. Apparatus as claimed in claim 27, including:

means for testing an emission of said first color, and for providing after said testing an automatic emission of said second color.

34. Apparatus as claimed in claim 21, including:

a power supply for supplying electric power through said circuit;

another power distribution circuit having a rated load capacity and being connected to said power supply; and

means connected to said power distribution circuits for emitting light of a predetermined color when electric power through either of said circuits is at a maximum current usage predetermined for that circuit.

35. Apparatus as claimed in claim 34, including:

means connected to said power supply for emitting light of another predetermined color when said power supply is in an operating condition.

36. Apparatus as claimed in claim 21, including:

a first overload current interrupter at an input of said circuit;

a second overload current interrupter at an output of said circuit;

means for emitting light of a first color when both said first and second overload current interrupters are conducting electric current;

means for emitting light of a second color when a predetermined one of said first and second overload current interrupters has responded to an overload condition; and

means for emitting light of a third color when the other one of said first and second overload current interrupters has responded to an overload condition.

37. Apparatus as claimed in claim 36, wherein:

at least one of said light emitting means includes means for providing one of said first, second and third colors by combining emission of light of another of said first, second and third colors with a remaining one of said first, second and third colors.

38. In apparatus for monitoring electric power distribution circuits having rated load capacities and being connected to a power supply, the improvement comprising in combination the steps of:

means including a polarized relay connected to said power supply and including a light source connected to said polarized relay for emitting light of one color when said power supply is in an operating condition; and

means connected to said circuits and to said polarized relay for deenergizing said polarized relay and for emitting light of another color when electric power through either of said circuits is at a maximum current usage predetermined for that circuit.

39. In apparatus for monitoring electric power distribution circuitry having input and output overload current interrupters, the improvement comprising in combination the steps of:

means for emitting light of a first color when said input and output overload current interrupters are conducting electric current;

means for emitting light of a second color when any output overload current interrupter has responded to an overload condition; and

means for emitting light of a third color when any input overload current interrupter has responded to an overload condition.

40. Apparatus as claimed in claim 39, wherein:

at least one of said light emitting means includes means for providing one of said first, second and third colors by combining emission of light of another of said first, second and third colors with a remaining one of said first, second and third colors.

41. Apparatus as claimed in claim 39, including:

energizable means for effecting an alarm in a deenergized condition;

means connected to said energizable means and to said means for emitting light of a first color for suspending said alarm by energizing said energizable means and for causing emission of said light of a first color when said input and output overload current interrupters are conducting electric current;

means connected to said energizable means and to said means for emitting light of a second color, and coupled to said output overload current interrupters for activating said alarm by deenergizing said energizable means and for causing emission of said light of a second color when any output overload current interrupter has responded to an overload condition; and

means connected to said energizable means for activating said alarm also by deenergizing said energizable means when any input overload current interrupter has responded to an overload condition.

42. Apparatus as claimed in claim 41, wherein:

said means for emitting light of a third color include means connected to said means for emitting light of a first color and to said means for emitting light of a second color for causing emission of light of a third color when the latter input overload current interrupter has responded to an overload condition.

43. Apparatus as claimed in claim 41, wherein:

one of said means for deenergizing said energizable means includes means for energizing said energizable means equally at two sides thereby causing deenergization of said energizable means for activating said alarm.

44. In apparatus for monitoring an electric distribution circuit having a bus of one polarity and a bus of another polarity, the improvement comprising in combination:

two LED'"'"'s connected back to back for emitting light of different colors;

means including a relay connected in series with one of said LED'"'"'s between said busses for indicating normal operation of said electric power supply circuit by energizing said relay and energizing said one LED to emit light of one of said colors;

means connected to said electric supply circuit and to the other of said two LED'"'"'s for back-biasing said other LED during said normal operation;

means connected to said relay and to a junction between said two LED'"'"'s for deenergizing in response to an alarm condition said one LED and said relay with a potential derived from one of said busses, and for energizing said other LED to emit light of another of said colors.

45. Apparatus as claimed in claim 44, wherein:

said means for deenergizing said one LED and said relay include a unidirectional current conducting device connected between said relay and said one LED to disconnect said relay and said one LED from each other in response to said potential.

46. Apparatus as claimed in claim 44, including:

means connected between said busses and to said other LED for energizing said other LED to emit light of another color and for deenergizing said relay in response to another alarm condition, and for deenergizing said one LED.