System for comparing real-time data and modeling engine data to predict arc flash events

• US 8,688,429 B2
• Filed: 04/13/2010
• Issued: 04/01/2014
• Est. Priority Date: 03/10/2006
• Status: Active Grant

• Current Assignee: Power Analytics Corporation (PAC Global, Inc.)
• Original Assignee: Power Analytics Corporation (PAC Global, Inc.)
• Inventors: Nasle, Adib, Nasle, Ali
• Primary Examiner(s): Fernandez Rivas, Omar
• Assistant Examiner(s): CALLE, ANGEL J.
• Application Number:
  US12/759,234
• Publication Number:
  US 20100268396A1
• Time in Patent Office: 1,449 Days
• Field of Search: 703/9, 703/5, 703/14, 703/18, 700/286, 700/291, 361/42
• US Class Current: 703/18
• CPC Class Codes: G05B 17/02 electric
• CPC Class Codes: G05B 23/0254 based on a quantitative model, e.g. mathematical relationships between inputs and outputs; functions: observer, Kalman filter, residual calculation, Neural Networks
• CPC Class Codes: G06F 2111/02 CAD in a network environment, e.g. collaborative CAD or distributed simulation
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30
• CPC Class Codes: G06F 30/367 Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods

Abstract

A system for making real-time predictions about an arc flash event on an electrical system is disclosed. The system includes a data acquisition component, an analytics server and a client terminal. The data acquisition component is communicatively connected to a sensor configured to acquire real-time data output from the electrical system. The analytics server is communicatively connected to the data acquisition component and is comprised of a virtual system modeling engine, an analytics engine and an arc flash simulation engine. The arc flash simulation engine is configured to utilize the virtual system model to forecast an aspect of the arc flash event.

Claims

1. A method for making real-time predictions about an arc flash event on an electrical system, the method comprising:

identifying a difference between real-time data acquired from an electrical system and predicted data output generated using a virtual system model of the electrical system;

if the difference exceeds a first threshold but not a second threshold, calibrating the virtual system model;

if the difference exceeds the second threshold, generating an alarm;

choosing a standard to supply equations used in the arc flash event calculations;

simulating the arc flash event using the virtual system model in accordance with the chosen standard;

calculating a quantity of arc energy released by the arc flash event using results from the simulation; and

communicating a report that forecasts an aspect of the arc flash event.

2. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 1, wherein the arc flash event is an alternating current arc flash event.

3. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 1, wherein the arc flash event is a direct current arc flash event.

4. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 1, wherein the standard applied is IEEE 1584.

5. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 4, wherein the calculation of the quantity of arc energy released includes:

determining bolted fault current values for the electrical system;

determining a system voltage level for the electrical system;

identifying an equipment classification for a protective device impacted by the arc flash event;

calculating a first arcing current value and a second arcing current value, wherein the second arcing current value is 15 percent (%) less than the first arcing current value;

performing a time-current curve analysis for the first arcing current value and the second arcing current value to respectively determine a first fault clearing time and a second fault clearing time for the protective device;

calculating a first arcing energy quantity using the first arc current value and the first fault clearing time;

calculating a second arcing energy quantity using the second arc current value and the second fault clearing time; and

selecting a larger of the first arcing energy quantity and the second arcing energy quantity as the quantity of arc energy released by the protective device.

6. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 1, wherein the standard applied is NFPA 70E.

7. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 6, wherein the calculation of the quantity of arc energy released includes:

determining bolted fault current values for the electrical system;

determining a system voltage level for the electrical system;

identifying an equipment classification for a protective device impacted by the arc flash event;

performing a time-current curve analysis to determine fault clearing time for the protective device; and

calculating the quantity of arc energy released by the protective device.

8. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 1, wherein the forecasted aspect is an arc flash protection boundary around a component within the electrical system.

9. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 8, wherein the component is a protective device.

10. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 9, wherein the protective device is a switch.

11. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 9, wherein the protective device is a circuit breaker.

12. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 9, wherein the protective device is a fuse.

13. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 9, wherein the protective device is a relay.

14. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 1, wherein the forecasted aspect is a level of personal protective equipment (PPE) to be worn by personnel operating around components of the electrical system.

15. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 14, wherein the level of PPE is based on National Fire Protection Association (NFPA) 70E classification categories.

16. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 15, wherein the NFPA 70E classification categories is selected from a group consisting of Category 0, Category 1, Category 2, Category 3, and Category 4.

17. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 16, wherein Category 0 denotes that the PPE must withstand minimum incident energy of 1.2 Cal/cm².

18. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 16, wherein Category 1 denotes that the PPE must withstand minimum incident energy of 4 Cal/cm².

19. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 16, wherein Category 2 denotes that the PPE must withstand minimum incident energy of 8 Cal/cm².

20. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 16, wherein Category 3 denotes that the PPE must withstand minimum incident energy of 25 Cal/cm².

21. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 16, wherein Category 4 denotes that the PPE must withstand minimum incident energy of 40 Cal/cm².

22. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 1, wherein the report is communicated using graphics rendered on a terminal display.

23. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 1, wherein the report is communicated using text rendered on a terminal display.

24. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 1, wherein the report is communicated by way of synthesized speech generated by a client terminal.

25. The method for making real-time predictions about an arc flash event on an electrical system, as recited in claim 1, further including:

creating arc flash labels displaying the forecasted aspect.