Influence of paper insulation on acceptable gas-in-oil levels in transformers

Author

Duval, M. ; Langdeau, F. ; Gervais, P. ; Bélanger, G.

Author_Institution

Hydro-Quebec, Varennes, Que., Canada

fYear

1989

fDate

29 Oct-2 Nov 1989

Firstpage

358

Lastpage

362

Abstract

The influence of cellulose on acceptable gas-in-oil levels in high-voltage transformers as indicated by the value of the CO₂/CO ratio is assessed by means of dissolved-gas analysis. The results presented here are based on 6932 gas-in-oil analyses on 1320 Hydro-Quebec transformers over a period of 20 years. Preliminary results indicate that C₂H₄ levels are affected by cellulose participation for both arcing and hot spots. The effect can be felt starting from CO₂/CO ratios <6 for arcing and <2 for hot spots. These results suggest that the acceptable and dangerous levels of dissolved C₂H₄ in power transformers must be greatly reduced as the CO₂/CO ratio in the oil decreases

Keywords

arcs (electric); electric breakdown of liquids; insulating oils; paper; power transformers; transformer insulation; 1320 Hydro-Quebec transformers; 20 years; 6932 gas-in-oil analyses; CO; CO₂; arcing; cellulose participation; dissolved-gas analysis; ethane; high-voltage transformers; hot spots; paper insulation effect; power transformers; Corona; Dissolved gas analysis; Fault detection; Fault diagnosis; Gas insulation; Gases; Hydrogen; Petroleum; Power transformer insulation; Power transformers;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical Insulation and Dielectric Phenomena, 1989. Annual Report., Conference on

Conference_Location

Leesburg, VA

Type

conf

DOI

10.1109/CEIDP.1989.69572

Filename

69572