Transformer State Determination via Dissolved Gas Data Correction

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Solution Overview

Problem

Current methods for determining the state of transformers based on dissolved gas analysis face challenges due to measurement errors, particularly when oil filtering is not considered, leading to inaccurate diagnoses and potential equipment failures.

Innovation Solution

A method and apparatus that correct measurement errors in dissolved gas data by determining a measurement error value, considering oil filtering, and using a similar data set for correction, to accurately determine the transformer state.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If dissolved gas data is used to determine transformer state, then transformer diagnosis capability is improved, but measurement errors lead to inaccurate diagnosis

Engineering Contradiction:

Improvetransformer diagnosis accuracyVSAvoiddissolved gas measurement accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The system uses historical dissolved gas data and transformer operation data to establish a correction model that provides feedback to adjust measurement values. The correction model continuously learns from past data to improve the accuracy of measurement error correction, creating a closed-loop system that enhances diagnosis reliability over time.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

A correction model acts as an intermediary between the raw dissolved gas measurement data and the final transformer state determination. This intermediary process corrects measurement errors by comparing with historical data and operation conditions, filtering out inaccurate measurements before they affect the diagnosis outcome.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If oil filtering is not considered in measurement, then measurement process is simplified, but measurement error increases

Engineering Contradiction:

Improvemeasurement process complexityVSAvoiddissolved gas concentration accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The system performs preliminary analysis of operation data to determine whether oil filtering has occurred before using the dissolved gas data for diagnosis. By identifying filtering events in advance, the system can apply appropriate correction methods or flag the data accordingly, ensuring measurement accuracy without complicating the overall measurement process.

Inventive Principle:

Principle #10Preliminary action

3Ease of operation

If simple gas pattern analysis is used, then diagnosis method is easy to implement, but accurate transformer state determination is difficult

Engineering Contradiction:

Improvediagnosis method simplicityVSAvoidtransformer state determination accuracy

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The correction model serves multiple functions: it corrects measurement errors, identifies oil filtering events, validates data quality, and provides confidence assessment. This multi-functional approach maintains ease of operation while significantly improving determination accuracy through a single integrated system.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS11563320B2Apparatus and method for determining transformer state based on correction of dissolved gas data

Publication Date: 2023.01.24 ONEPREDICT CO LTD

AI summary

A method for determining a transformer state on the basis of correction of dissolved gas data includes receiving, by a transformer state determination apparatus, dissolved gas data, determining, by the transformer state determination apparatus, a measurement error value which is a correction target in the dissolved gas data, correcting, by the transformer state determination apparatus, the measurement error value, and determining, by the transformer state determination apparatus, a transformer state on the basis of the dissolved gas data including the corrected measurement error value.