D.C. battery plant alarm monitoring remote apparatus

• US 5,661,463 A
• Filed: 04/17/1995
• Issued: 08/26/1997
• Est. Priority Date: 04/17/1995
• Status: Expired due to Fees

• Current Assignee: Communications Test Design Incorporated
• Original Assignee: Communications Test Design Incorporated
• Inventors: Letchak, Edward A., Citrullo, Stephen M.
• Primary Examiner(s): Hofsass, Jeffery
• Assistant Examiner(s): MANNAVA, ASHOK K
• Application Number:
  US08/422,451
• Time in Patent Office: 862 Days
• Field of Search: 340/636, 340/660, 340/661, 324/426, 324/427, 324/428, 324/431, 324/433, 320/48
• US Class Current: 340/636.15
• CPC Class Codes: G01R 31/3648 comprising digital calculation means, e.g. for performing an algorithm
• CPC Class Codes: G01R 31/374 with means for correcting the measurement for temperature or ageing
• CPC Class Codes: Y10S 320/21 State of charge of battery

Abstract

An automatic monitoring system of storage batteries housed at an application site which includes an A.C. power source at the site, a mechanism to interrupt the A.C. power from its source and generate an alarm, a battery plant to provide D.C. power when the A.C. power is interrupted, a mechanism to automatically detect and measure the voltages generated from said battery plant, a mechanism to measure the midpoint of the D.C. battery discharge voltage by measuring the rate of change of said voltage over time and halving the difference between plateau and end of life voltages, a mechanism to generate an alarm message (a) if said midpoint has been reached, (b) if a predetermined low battery cutoff voltage has been reached, (c) if the battery plant is being overcharged or undercharged, and/or (d) if A.C. power is interrupted. The alarm messages are generated while taking into consideration an environmental condition, such as temperature, which causes an adjustment to the measured voltages received from the battery plant. A computer is used to display the alarm messages for appropriate corrective action by a technician located at an operations center.

Claims

1. Apparatus for monitoring performance of a battery or system of connected batteries in a large battery plant facility, comprising

an A.C. power source located at a predetermined application site;

a means to interrupt power from the A.C. power source;

a means to monitor D.C. battery power to equipment at said application site when said A.C. power is interrupted;

a means to automatically detect and measure a changing voltage level of said D.C. power plant capacity by applying a percentage to the difference between a calculated plateau voltage and a predetermined end of life voltage and then adding the result of applying the percentage to the difference to said predetermined end of life voltage;

a means to automatically generate an alarm message at said application site when said D.C. power is measured to be at a predetermined voltage capacity level; and

a means to determine the remaining life of said D.C. power means when said predetermined capacity level has been determined.

2. The apparatus of claim 1 wherein said predetermined voltage capacity is at a fifty percent level.

3. The apparatus of claim 2 wherein said D.C. capacity level measuring means determines if said fifty percent level of D.C. power has not been reached.

4. The apparatus of claim 1 wherein said plateau voltage is calculated by determining a rate of change over time of D.C. voltages generated from said battery plant beginning immediately after the interruption of said A.C. power.

5. The apparatus of claim 4 further comprising a means to sense ambient temperature at said application site to adjust said plateau voltage in accordance with actual environmental conditions at the application site.

6. The apparatus of claim 5 further comprising a means to sense ambient temperature surrounding at least one battery in said system of connected batteries to ascertain if said battery is performing properly as expected.

7. The apparatus of claim 6 further including a means to generate a battery test request at said operations center which is communicated to the D.C. power measuring means.

8. The apparatus of claim 6 further including a means to generate a battery test request at said remote location which is communicated to the D.C. power measuring means.

9. The apparatus of claim 4 wherein the plateau voltage is determined to have been reached when said rate of change drops to less than four hundred millivolts.

10. The apparatus of claim 1 further comprising a means to transmit said alarm message at said application site to an operations center at a remote location.

11. The apparatus of claim 10 further comprising a means located at a facility other than at the application site or at the operations center to receive the alarm message from said application site and convert said message into appropriate form to be sent to a communications link network at the operations center.

12. The apparatus of claim 10 further comprising:

a communications link means at said operations center for receiving said alarm message from said message alarm generating means; and

a computer means in connection with said communications link for triggering an alarm message to dispatch a technician to said site to ascertain if a battery needs replacement.

13. The apparatus of claim 1 further comprising multiple strings of connected batteries which are individually monitored by said apparatus to ascertain if each is capable of sustaining the operation of said equipment in the event A.C. power is interrupted.

14. The apparatus of claim 1 wherein said D.C. capacity level measuring means also determines if said batteries are experiencing an abnormal charging condition while A.C. power is sustaining the operation of the equipment.

15. The apparatus of claim 14 further comprising a means to generate an alarm whenever an abnormal charging condition occurs when said equipment at said site is being provided with A.C. power.

16. The apparatus of claim 1 wherein said D.C. capacity level measuring means determines if a low battery cutoff voltage has been reached.

17. The apparatus of claim 16 wherein a battery alarm message is activated if said low battery cutoff voltage has been reached.

18. The apparatus of claim 1 further comprising a means to automatically generate an alarm message at said application site when said A.C. power has been interrupted.

19. The apparatus of claim 1 further comprising a means to interrupt the A.C. power at the application site and to reactivate the D.C. power under software control.

20. The apparatus of claim 1 further comprising a means to sense battery case temperature to determine if an abnormal temperature condition exists, and if said condition does exist, to initiate an alarm message from said alarm generating means.