Hybrid Dissolved Gas-in-Oil Analysis Methods

Leonidha Londo,Rajmonda Bualoti,Marialis Çelo,Nako Hobdari

doi:10.4236/jpee.2015.36002

Leonidha Londo, Rajmonda Bualoti + Show 2 more

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https://doi.org/10.4236/jpee.2015.36002

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Abstract

Dissolved gas analysis is the most widely used diagnostic test in power transformers. The aim of this paper is to introduce the dissolved gas analysis (DGA) methods able to diagnose the transformer conditions. The faults cause the transformer oil, pressboard, and other insulating materials to decompose and generate gases, some of which dissolve in the oil. The results of DGA must be accurate if faults are to be diagnosed reliably. There are different established methods used in industry for interpreting DGA results. We will compare the result of IEEE Key Gas Methods and Rogers’ Ratios. The transformer conditions are evaluated by the Key Gas Method with total combustible gas method (TCGM) and then verified by the Rogers’ Ratios. As result, the aging pattern and trend of the power transformer deterioration can be determined. The 30 sample data from IEEE with known faults and dissolved gas concentrations were used as the basis of comparison.

Highlights

A transformer is the most important equipment for power supply to consumers
dissolved gas analysis (DGA) diagnostic tools vary in their complexity and accuracy
That is why among different methods for interpreting DGA results, we will use hybrid method based in the Key Gas Method with total dissolved combustible gas method to be evaluated and verified by the Rogers’ Ratios

Summary

Introduction

A transformer is the most important equipment for power supply to consumers. Failure of one power transformer may cause long interruptions in supply, costly repairs and loss of revenue. For uninterrupted power supply to consumers, proper maintenance, preventive maintenance, is very necessary. The failure in magnetic, electric and dielectric circuits as well as structural failure may cause extensive damage to the equipment and surroundings. Proper operation and maintenance procedure may help to prevent failure and extend life of operation of the transformer. How to cite this paper: Londo, L., Bualoti, R., Çelo, M. and Hobdari, N. Journal of Power and Energy Engineering, 3, 10-19.

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