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US 12,683,427 B2Granted
Method and system of detection of dropped loads resulting from an electrical power quality event
AssigneeEaton Intelligent Power Limited
InventorsDonald T. McComas, Roger W. Cox
Life of this patent
Estimating the term…
Abstract
A method of power quality monitoring includes: capturing a power quality event; determining that the captured power quality event is one of a voltage sag, a swell or an interruption; in response to determining the captured power quality event is one of the voltage sag, the swell or the interruption, selecting a pre-event interval and a post-event interval; comparing a pre-event load level and a post-event load level; and detecting a load loss based on a result of the comparison.
Claims16
A method of power quality monitoring of a power system including an intelligent power device coupled to a plurality of loads, comprising:
- capturing a power quality event occurring over a part of a plurality of time intervals each having an equal duration, the part spanning one or more time intervals;
- determining that the captured power quality event is one of a voltage sag, a swell or an interruption;
- in response to determining that the captured power quality event is one of the voltage sag, the swell or the interruption, selecting a pre-event interval comprising one time interval preceding the one or more time intervals and a post-event interval comprising one time interval following the one of more time intervals;
- comparing a pre-event load level measured during the pre-event interval and a post-event load level measured during the post-event interval;
- detecting a load loss based on a result of the comparison;
- transmitting a power quality event report comprising at least the captured power quality event, the detected load loss and load loss parameters associated with the captured power quality event to a user;
- and
- in response to detecting the load loss, categorizing the captured power quality event in at least one of a look-up table or an event log within the intelligent power device,
- wherein the categorizing the captured power quality event comprises:
- determining that the load loss parameters associated with the captured power quality event are similar to load loss parameters of a previous power quality event;
- and
- in response to determining that the load loss parameters associated with the captured power quality event are similar to the load loss parameters of the previous power quality event, tagging the captured power quality event to match a tag for the previous power quality event, and entering the tagging into at least one of the look-up table or the event log, wherein the tag for the previous power quality event comprises a consequence of the previous power quality event and the consequence includes identity of a load lost as a result of the previous power quality event;
- or
- in response to determining that the load loss parameters associated with the captured power quality event are not similar to the load loss parameters of the previous power quality event, generating a new tag for the captured power quality event according to the detected load loss and entering the new tag into at least one of the look-up table or the event log.
11 more elements
A power quality monitoring system comprising:
- a plurality of loads;
- a user device;
- and
- an intelligent power device coupled to the plurality of loads and structured to monitor power quality and energy within the power quality monitoring system, the intelligent power device comprising a power supply, a display, a metering device, and a controller structured to control power quality and energy monitoring by the intelligent power device, the controller comprising a power quality monitoring device and a communication device communicatively coupled to a user device and the plurality of loads,
- wherein the power quality monitoring device comprises:
- (i) a load loss detector structured to:
- capture a power quality event occurring over a part of a plurality of time intervals each having an equal duration, the part spanning one or more time intervals;
- determine that the captured power quality event is one of a voltage sag, a swell or an interruption;
- in response to determining that the captured power quality event is one of the voltage sag, the swell or the interruption, select a pre-event interval comprising one time interval preceding the one or more time intervals and a post-event interval comprising one time interval following the one of more time intervals;
- compare a pre-event load level measured during the pre-event interval and a post-event load level measured during the post-event interval;
- and
- detect a load loss based on a result of the comparison;
- (ii) a power quality event report generator structured to generate a power quality event report including at least one of the captured power quality event, a detected load loss and load loss parameters associated with the captured power quality event and transmit the power quality event report to the user device via the communication device;
- and
- (iii) a look-up table structured to store a plurality of data for use in the power quality and energy monitoring and be accessible by a user for at least one of viewing any of the plurality of data or categorizing the captured power quality event via at least the user device,
- wherein in comparing the pre-event load level measured during the pre-event interval and a post-event load level measured during the post-event interval, the load loss detector is further structured to:
- establish a load variation tolerance using a load level measured over at least one time interval preceding the one or more time intervals;
- obtain a difference between the pre-event load level and the post-event load level;
- and
- determine that the difference exceeds the established load variation tolerance,
- wherein the load loss parameters included in the power quality event report comprise voltage-Ampere (VA) load loss, current load loss, harmonic load loss, Watt load loss, and VA-reactive (VAR) load loss.
18 more elements
Dependencies are inferred from the claim text.