Predication of Life of Transformer insulation by developing Relationship between Degree of Polymerization and 2- Furfural

Degradation of cellulosic materials can be identified by measuring dissolved carbon oxide gas content in oil, Degree Polymerization (DP) of paper and 2-Furfurol content in oil. Each method has some advantages and limitations. In case of dissolved carbon oxide gas analysis and furan content determination, sampling is easy but interpretation of result is not very reliable. On the other hand DP measurement of paper is reliable and accurate but it is not practical top draw paper sample from transformer in service. Therefore, attempts are being made to establish a reliable and good correlation among above parameters to get a simple and accurate resu lt. This paper presents relation between DP and furan content. For given oil sample furan content first measured and using above relation DP value can be easily identified. Also this relationship is verified by with results of five no’s field failed transformers.