# US 11,442,083 B2 · Systems and methods for intelligent event waveform analysis > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,442,083 B2 - Document ID: US11442083B2 - Status: Granted - Kind: B2 - Application number: 17/044,918 - Filed: 2019-04-04 - Published: 2021-06-03 - Granted: 2022-09-13 - Earliest claimed: 2018-04-04 - Assignees: Schneider Electric USA, Inc. - Applicants: Schneider Electric USA, Inc. - Inventors: Johannes Menzel; Jon Bickel - Web page: https://patentgrep.com/patent/US11442083B2 ## CPC - G01R 19/2513: {Arrangements for monitoring electric power systems, e.g. power lines or loads; Logging} - G01R 19/2509: {Details concerning sampling, digitizing or waveform capturing} - G01R 31/088: {Aspects of digital computing} - H02J 3/00: Circuit arrangements for AC mains or AC distribution networks - H02J 3/0012: characterised by the contingency detection means in AC networks, e.g. using phasor measurement units [PMU], synchrophasors or contingency analysis - H02J 3/003: {Load forecast, e.g. methods or systems for forecasting future load demand} - H02J 13/12: Monitoring network conditions, e.g. electrical magnitudes or operational status - Y04S 10/18: using switches, relays or circuit breakers, e.g. intelligent electronic devices [IED] - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H02J: ELECTRIC POWER NETWORKS; CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY - Y04S: SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS ## Abstract 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. ## Claims ### Claim 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. ### Claim 2 (depends on 1) The method of claim 1, wherein the power event includes a power quality event. ### Claim 3 (depends on 1) The method of claim 1, further comprising: determining at least one cause of the power event from the additional information. ### Claim 4 (depends on 1) The method of claim 1, further comprising: determining an impact of the power event on equipment in the electrical/power system. ### Claim 5 (depends on 4) 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. ### Claim 6 (depends on 4) 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. ### Claim 7 (depends on 1) The method of claim 1, wherein the at least one component includes equipment in the electrical/power system. ### Claim 8 (depends on 1) 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. ### Claim 9 (depends on 8) 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. ### Claim 10 (depends on 1) 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. ### Claim 11 (depends on 1) 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. ### Claim 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. ### Claim 13 (depends on 12) The system of claim 12, wherein the power event includes a power quality event. ### Claim 14 (depends on 12) 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. ### Claim 15 (depends on 12) 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. ### Claim 16 (depends on 15) The system of claim 15, wherein the system comprises at least one IED which is coupled to the electrical/power system equipment. ### Claim 17 (depends on 12) 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. ### Claim 18 (depends on 12) The system of claim 12, wherein the at least one component includes equipment in the electrical/power system. ### Claim 19 (depends on 12) 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. ### Claim 20 (depends on 19) 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. ### Claim 21 (depends on 12) 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. ### Claim 22 (depends on 12) 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. ### Claim 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.