پریود آنالیز گازهای تولید شده بسته به شرایط ترانس می تواند از یکبار در سال تا یکبار درماه متغیر باشد. لطفاً به منبع زیر در این ارتباط مراجعه فرمائید.
For Dissolved Gas Analysis on power Transformer the standards associated with sampling, testing and analyzing the results are ASTM D3613, ASTM D3612 and ANSI/IEEE C57.104 respectively.
Frequency of DGA monitoring
Depending on the concentration of individual gas components it is possible to fix or alter the period of DGA monitoring of trans-formers in service from once in a month to once in a year.
Case .1 : Results are normal and transformer needs DGA monitoring once in a year or Results have shown a small increase in gas concentration other than C2H2and subsequently the values are steady or showing decreasing trends in such case the frequency of DGA monitoring for transformer will be once in a year.
Case.2: Results have indicated the presence of C2H2 and there is no rise in concentration or there is fluctuating of gas concentration the frequency of monitoring will be increased to two to four times in a year.
Case.3 : Results had indicated a steady and sustained rise in gas concentration of C2H2 and / or C2H4 and afterwards gas values are remaining constant or increasing at a rapid manner then the frequency of monitoring will have to be increased from once in a year to twelve times in a year.
Case.4 : Initial result shows a substantial concentration of one or more gases and one of the gases shows rapid increase then the transformer will have to be immediately opened and fault will have to be looked into.
The following table shows various interpretation methods of DGA and their results.
International Journal of Advancements in Research & Technology, Volume 1, Issue6, November-2012 1 ISSN 2278-7763
Statistical approach for Dissolved Gas Analysis on power Transformer
1K.Iyswarya Annapoorani, 2Dr.K.UdayaKumar, 3Dr.B.Umamaheswari