Method and apparatus for analyzing waveform signals of a power system
First Claim
Patent Images
1. A method for remediating a restrike condition in a power system comprising:
- a) operating a current interrupter device coupled to the power system and structured to disrupt the flow of current through the power system;
b) operating an intelligent electronic device in communication with the current interrupter device and the power system, the intelligent electronic device being structured to receive a waveform signal from the power system corresponding to an electrical characteristic of the power system;
c) digitalizing the waveform signal obtained from said power system with the intelligent electronic device;
d) filtering the digitalized waveform signal with the intelligent electronic device, said filtering occurring without any pre-modeling of said digitalized waveform signal;
e) storing in a non-transitory computer readable medium said filtered waveform signal;
f) identifying one or more segments on said stored, filtered waveform signal with the intelligent electronic device using a recursive cumulative sum technique comprising;
i. determining change points by using a monitoring process on said filtered waveform in which there is no target value for a reference change parameter to accumulate a value for said reference change parameter that is a predetermined change in said filtered waveform signal,ii. continuing said accumulation of said values for said reference change parameter until all changes occurring in a defined threshold are detected in said filtered waveform signal,iii. declaring a change point when said accumulated value for said reference change parameter occurring in said defined threshold is equal to or higher than a predefined alarm value, the alarm value being structured to produce an intentional delay in detecting the change points, andiv. adjusting the declared change point effective to reduce the intentional delay by applying an unsupervised classification technique without the use of training data to said digitalized waveform signal, wherein the unsupervised classification technique includes forming a data neighborhood, and dividing the data neighborhood into two classes, the two classes being separated by a modified change point;
g) classifying with the intelligent electronic device each of said one or more identified segments as corresponding to an arcing or non-arcing condition in the power system using information content in said digitalized waveform signal about each of said one or more identified segments;
h) determining with the intelligent electronic device that the restrike condition is occurring within the current interrupter device using the classification of each of said one or more identified segments;
i) storing, in the non-transitory computer readable medium, the one or more identified segments corresponding to an arcing in the power system and including the signal segmentation and classification with said reduced intentional delay; and
j) operating a protective device to isolate the one or more identified segments corresponding to an arcing condition in the power system in response to the act of determining that the restrike condition is occurring.
4 Assignments
0 Petitions
Accused Products
Abstract
Method and apparatus for analyzing waveform signals of a power system. A waveform signal obtained from the power system is digitalized and then filtered. One or more segments are identified on the filtered waveform signal and, based on the information content of the identified segments, each of the one or more identified segments are classified as corresponding to a normal or abnormal condition occurred in the power system.
-
Citations
19 Claims
-
1. A method for remediating a restrike condition in a power system comprising:
-
a) operating a current interrupter device coupled to the power system and structured to disrupt the flow of current through the power system; b) operating an intelligent electronic device in communication with the current interrupter device and the power system, the intelligent electronic device being structured to receive a waveform signal from the power system corresponding to an electrical characteristic of the power system; c) digitalizing the waveform signal obtained from said power system with the intelligent electronic device; d) filtering the digitalized waveform signal with the intelligent electronic device, said filtering occurring without any pre-modeling of said digitalized waveform signal; e) storing in a non-transitory computer readable medium said filtered waveform signal; f) identifying one or more segments on said stored, filtered waveform signal with the intelligent electronic device using a recursive cumulative sum technique comprising; i. determining change points by using a monitoring process on said filtered waveform in which there is no target value for a reference change parameter to accumulate a value for said reference change parameter that is a predetermined change in said filtered waveform signal, ii. continuing said accumulation of said values for said reference change parameter until all changes occurring in a defined threshold are detected in said filtered waveform signal, iii. declaring a change point when said accumulated value for said reference change parameter occurring in said defined threshold is equal to or higher than a predefined alarm value, the alarm value being structured to produce an intentional delay in detecting the change points, and iv. adjusting the declared change point effective to reduce the intentional delay by applying an unsupervised classification technique without the use of training data to said digitalized waveform signal, wherein the unsupervised classification technique includes forming a data neighborhood, and dividing the data neighborhood into two classes, the two classes being separated by a modified change point; g) classifying with the intelligent electronic device each of said one or more identified segments as corresponding to an arcing or non-arcing condition in the power system using information content in said digitalized waveform signal about each of said one or more identified segments; h) determining with the intelligent electronic device that the restrike condition is occurring within the current interrupter device using the classification of each of said one or more identified segments; i) storing, in the non-transitory computer readable medium, the one or more identified segments corresponding to an arcing in the power system and including the signal segmentation and classification with said reduced intentional delay; and j) operating a protective device to isolate the one or more identified segments corresponding to an arcing condition in the power system in response to the act of determining that the restrike condition is occurring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
-
-
9. A system comprising:
-
a current interrupter device structured to disrupt the flow of current in a power system; and an intelligent electronic device structured to receive a waveform signal from the power system, said intelligent electronic device comprising a computer device including a non-transitory memory configured to encode program instructions and structured to execute the following program instructions encoded in memory; a) digitalize the waveform signal; b) filter the digitalized waveform signal, said filtering occurring without any pre-modeling of said digitalized waveform signal; c) identify one or more segments on said filtered waveform signal using a recursive cumulative sum technique comprising; i. determining change points on said filtered waveform signal by using a monitoring process in which there is no target value for a reference change parameter to accumulate a value for said reference change parameter that is a predetermined change in said filtered waveform signal, ii. continuing said accumulation of said values for said reference change parameter until all changes occurring in a defined threshold are detected in said filtered waveform signal, iii. declaring a change point when said accumulated value for said reference change parameter occurring in said defined threshold is equal to or higher than a predefined alarm value, the alarm value being structured to produce an intentional delay in detecting the change points, and iv. adjusting the declared change point effective to reduce the intentional delay by applying an unsupervised classification technique without the use of training data to said digitalized waveform signal, wherein the unsupervised classification technique includes forming a data neighborhood, dividing the data neighborhood into two classes, the two classes being separated by a modified change point; d) after said one or more segments are identified on said filtered waveform signal, use information content in said digitalized waveform signal about each of said one or more identified segments to classify each of said one or more identified segments as corresponding to an arcing or non-arcing condition having occurred in the power system; and e) determining a restrike condition is occurring within the current interrupter device using the classification of each of said one or more identified segments; f) storing, in the non-transitory memory, one or more of the identified segments indicating a restrike condition in the power system and including the signal segmentation and classification with said reduced intentional delay; and g) operating a protective device to isolate the one or more identified segments corresponding to a restrike condition in the power system in response to the act of determining that the restrike condition is occurring. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
-
-
17. An intelligent electronic device structured to communicate with a power system and a current interrupter structured to disrupt the flow of current in the power system, said intelligent electronic device comprising:
-
a non-transitory computer readable medium configured to encode program instructions and structured to execute the following program instructions encoded in memory; a) digitalize a waveform signal obtained from said power system; b) filter the digitalized waveform signal, said filtering occurring without any pre-modeling of said digitalized waveform signal; c) use a recursive cumulative sum technique to identify one or more segments on said filtered waveform signal, comprising; i. determining change points signal by using a monitoring process on said filtered waveform in which there is no target value for a reference change parameter to accumulate a value for said reference change parameter that is a predetermined change in said filtered waveform signal, ii. continuing said accumulation of said values for said reference change parameter until all changes occurring in a defined threshold are detected in said filtered waveform signal, iii. declaring a change point when said accumulated value for said reference change parameter occurring in said defined threshold is equal to or higher than a predefined alarm value, the alarm value being structured to produce an intentional delay in detecting the change points, and; iv. adjusting the declared change point effective to reduce the intentional delay by applying an unsupervised classification technique without the use of training data to said digitalized waveform signal, wherein the unsupervised classification technique includes forming a data neighborhood, and dividing the data neighborhood into two classes, the two classes being separated by a modified change point; d) using, after said one or more segments are identified on said filtered waveform signal information, content in said digitalized waveform signal about each of said one or more identified segments to classify each of said one or more identified segments as corresponding to an arcing or non-arcing condition having occurred in the power system; e) determining a restrike condition is occurring within the current interrupter using the classification of each of said one or more identified segments; f) storing, in the non-transitory computer readable medium, one or more of the identified segments indicating a restrike condition in the power system and including the signal segmentation and classification with said reduced intentional delay; and g) operating a protective device to isolate the one or more identified segments corresponding to a restrike condition in the power system in response to the act of determining that the restrike condition is occurring. - View Dependent Claims (18, 19)
-
Specification