Systems and methods for intelligent event waveform analysis
In a method and system, voltage and/or current signals on an electrical/power system is monitored. A power event is identified from the monitored voltage and/or current signals. In response to event identification, waveforms of the monitored voltage and/or current signals are captured. Energy-related signals are calculated and extracted from pre-event measurements, event measurements and post-event measurements using the captured waveforms. Additional information associated with the event is identified and calculated by comparing (a) the calculated and used energy-related signals from pre-event measurements, with (b) the calculated and used energy-related signals from post-event measurements.
1. A method of analyzing power events in an electrical/power system using at least one processor and sensor, the method comprising:
monitoring at least one of a voltage and current signal in the electrical/power system;
identifying a power event in the electrical/power system from the monitored at least one of the voltage and current signal;
in response to identifying the power event, capturing waveforms of the monitored at least one of the voltage and current signal;
determining energy-related information from pre-event measurements using the captured waveforms;
determining energy-related information from post-event measurements using the captured waveforms; and
identifying and/or deriving and/or calculating additional information associated with the power event by comparing (a) the determined energy-related information from pre-event measurements, with (b) the determined energy-related information from post-event measurements; and
performing an action affecting at least one component in the electrical/power system, providing additional actionable information to event report(s), or providing extracted signal(s) to an automated event analysis system,
wherein the energy-related information comprises energy-related signals, and the additional information includes identification of one or more duration variations in the energy-related signals by determining a duration of each half-cycle of a waveform from the captured waveforms.
2. The method of claim 1 , wherein the power event includes a power quality event.
3. The method of claim 1 , further comprising:
determining at least one cause of the power event from the additional information.
4. The method of claim 1 , further comprising:
determining an impact of the power event on equipment in the electrical/power system.
5. The method of claim 4 , wherein the additional information includes discriminate additional information, and the discriminate additional information is used to describe what type of loads in the electrical/power system were dropped or lost in response to the power event.
6. The method of claim 4 , wherein the waveform capturing is performed by at least a computer system, which is coupled to the electrical/power system equipment.
7. The method of claim 1 , wherein the at least one component includes equipment in the electrical/power system.
8. The method of claim 1 , wherein the captured energy-related information comprises waveforms of the monitored voltage and/or current from a first-time period before a start of the identified power event to a second-time period after a terminus of the identified power event.
9. The method of claim 8 , wherein the first-time period or the second-time period is adjustable according to an electrical or power condition on the electrical/power system.
10. The method of claim 1 , wherein the energy-related information comprises energy-related signals, and the additional information includes a phase shift of the energy-related signals, which satisfies a phase shift criteria.
11. The method of claim 1 , further comprising:
when the captured waveforms represent an unknown event profile of the electrical/power system, creating a new event profile based on the captured waveforms; and
updating a digital repository stored in a memory with the new event profile.
12. A system for analyzing power events in an electrical/power system, the system comprising:
memory;
one or more sensors configured to sense at least one of a voltage and current signal in the electrical/power system; and
one or more processors configured to:
monitor at least one of a voltage and current signal using the one or more sensors;
identify a power event in the electrical/power system from the monitored at least one of the voltage and current signal;
in response to identifying the power event, capture waveforms of the monitored at least one of the voltage and current signal;
determine energy-related information from pre-event measurements using the captured waveforms;
determine energy-related information from post-event measurements using the captured waveforms;
identify and/or derive and/or calculate additional information associated with the power event by comparing (a) determined energy-related information from pre-event measurements, with (b) the determined energy-related information from post-event measurements; and
perform an action affecting at least one component in the electrical/power system, provide additional actionable information to event report(s), or provide extracted signal(s) to an automated event analysis system,
wherein the energy-related information comprises energy-related signals, and the additional information includes identification of one or more duration variations in the energy-related signals by determining a duration of each half-cycle of a waveform from the captured waveforms.
13. The system of claim 12 , wherein the power event includes a power quality event.
14. The system of claim 12 , wherein the one or more processors are further configured to determine at least one cause of the power event from the additional information.
15. The system of claim 12 , wherein the one or more processors are further configured to determine an impact of the power event on equipment in the electrical/power system.
16. The system of claim 15 , wherein the system comprises at least one IED which is coupled to the electrical/power system equipment.
17. The system of claim 12 , wherein the additional information includes discriminate additional information, and the discriminate additional information is used to describe what type of loads in the electrical/power system were dropped or lost in response to the power event.
18. The system of claim 12 , wherein the at least one component includes equipment in the electrical/power system.
19. The system of claim 12 , wherein the energy-related information comprises waveforms of the monitored at least one of a voltage and current signal from a first-time period before a start of the identified power event to a second-time period after a terminus of the identified power event.
20. The system of claim 19 , wherein the first-time period or the second-time period is adjustable according to an electrical or power condition on the electrical/power system.
21. The system of claim 12 , wherein the energy-related information comprises energy-related signals, and the additional information includes a phase shift of the monitored voltage and/or current, which satisfies a phase shift criteria.
22. The system of claim 12 , wherein the one or more processors are further configured:
when the captured waveforms represent an unknown event profile of the electrical/power system, to create a new event profile based on the captured waveforms; and
to update a digital repository stored in the memory with the new event profile.
23. A tangible computer medium storing computer executable code, which when executed by a processor, is configured to implement a method of analyzing power events in an electrical/power system, the method comprising:
monitor at least one of a voltage and current signal in the electrical/power system;
identifying a power event in the electrical/power system from the monitored at least one of the voltage and current signal;
in response to identifying the power event, capturing waveforms of the monitored at least one of the voltage and current signal;
determining energy-related information from pre-event measurements using the captured waveforms;
determining energy-related information from post-event measurements using the captured waveforms;
identifying and/or deriving and/or calculating additional information associated with the power event by comparing (a) the determined energy-related information from pre-event measurements, with (b) the energy-related information from post-event measurements; and
performing an action affecting at least one component in the electrical/power system, providing additional actionable information to event report(s), or providing extracted signal(s) to an automated event analysis system,
wherein the energy-related information comprises energy-related signals, and the additional information includes identification of one or more duration variations in the energy-related signals by determining a duration of each half-cycle of a waveform from the captured waveforms.