Patent ID: 11867683
Assignee: HITACHI ENERGY LTD
Field: Measurement (Instruments)
Classification: CPC G  H | IPC G  H

Claim 10:
11. A method of training a machine classification learning technique, comprising:
generating a plurality of sets of artificial dissolved gas concentrations of a first number of diagnostic gases;
determining relative levels of the artificial dissolved gas concentrations;
plotting a first number of points representing each of the relative levels of the artificial dissolved gas concentrations on a respective one of a first number of radial axes, each of the first number of radial axes being equally angularly spaced around an origin in a two dimensional coordinate system, each of the first number of radial axes representing a relative level of one of the first number of diagnostic gases, the first number of points forming a polygon within the two dimensional coordinate system;
determining a centroid of the polygon;
determining a fault region in which the centroid of the polygon is located, out of a plurality of fault regions defined in the two dimensional coordinate system;
classifying a fault experienced by an oil-filled transformer based on the determined fault region within the composite fault region map; and
training a machine learning classification technique using the plurality of sets of artificial dissolved gas concentrations of a first number of diagnostic gases and associated faults as labeled training data, wherein the machine learning classification technique comprises a gradient boosting machine technique;
wherein the plurality of fault regions are defined in a composite fault region map that is a composite of a first fault region map that defines regions that classify basic electrical faults within the oil-filled transformer, wherein the definition of regions in the first fault region map is not based on carbonization of cellulose within the oil-filled transformer, and a second fault region map that defines regions that classify faults at least partially based on carbonization of cellulose within the oil-filled transformer;
wherein the first fault region map defines fault regions of T1, T2, and T3, the second fault region map defines fault regions of O, C, and T3-H, and the composite fault region map defines fault regions that are coterminous within the fault regions of T1, T2 and T3 in the first fault region map and the fault regions of O, C, and T3-H in the second fault region map.