Adaptive combined approach for intelligent transformer dissolved gas alarm detection

An edge device for generating dissolved gas cautions and alarms for power transformers, the edge device comprising memory coupled to at least one processor, the at least one processor configured to:

• receive data of a power transformer, the data comprising dissolved gas data or electrical data;
• set, based on a comparison of a measurement value of the data to an upper rolling window-based threshold or to a lower rolling window-based threshold, a measurement flag for the power transformer;
• determine a rate-of-change (RoC) of the data;
• set a RoC flag for the power transformer based on a comparison of the RoC to a delta RoC-based threshold;
• determine an acceleration of the data;
• set an acceleration flag for the power transformer based on a comparison of the acceleration to a percentile log-ratio change of measurements threshold;
• and
• set one of a no flag, a caution flag or an alarm flag for the power transformer based on the measurement flag, the RoC flag, and the acceleration flag.

A method for generating dissolved gas or electrical cautions and alarms for electrical devices, the method comprising:

• receiving, by at least one processor of an edge device, data of an electrical device, the data comprising dissolved gas data or electrical data;
• setting, by the at least one processor, based on a comparison of a measurement value of the data to an upper rolling window-based threshold or to a lower rolling window-based threshold, a measurement flag for the electrical device;
• determining, by the at least one processor, a rate-of-change (RoC) of the data;
• setting, by the at least one processor, a RoC flag for the electrical device based on a comparison of the RoC to a delta RoC-based threshold;
• determining, by the at least one processor, an acceleration of the data;
• setting, by the at least one processor, an acceleration flag for the electrical device based on a comparison of the acceleration to a percentile log-ratio change of measurements threshold;
• and
• setting, by the at least one processor, one of a no flag, a caution flag or an alarm flag for the electrical device based on the measurement flag, the RoC flag, and the acceleration flag.