WG 47 New frontiers of DGA interpretation Reunião Cigré D1 – 24/01/2012 Representantes do D1.01 Brasil: Adriana de Castro Passos Martins – CEMIG Jayme Nunes – Nynas Naphtenics

Escopo Os itens a serem investigados pelo WG serão os seguintes, todos relacionados com transformadores e seus acessórios: Estudos de caso e sugestões para problemas típicos e ações iniciadas pela interpretação da Análise Cromatográfica de Gases Dissolvidos; Significância de CO, CO 2 e CO 2 /CO para detecção de envolvimento de papel; Revisão do progresso no campo da Análise Cromatográfica.

Cronograma 2011: Kick-off meeting 2013: Final report 2014: Workshop/Tutorial Próxima Reunião em Bruxelas, Bélgica: 16 e 17/04/2012

Detalhamento Contribuições Sugeridas para a Próxima Reunião SUGGESTED CONTRIBUTIONS TO SECOND MEETING OF JWG D1/A2.47 IN BRUSSELS WG members are invited to prepare contributions on any one or all of the subjects indicated in the non-exhaustive list below: Participation to the DGA database of WG47: If you are able to incorporate your individual DGA database into the larger database of WG 47 in preparation, please see message sent separately (“DGA database of WG47”). Cases of faults in transformers: Report cases, other than those already presented in Regensburg: -with high gassing but without failure, of T3 in oil, D1/D2 in oil, T3/T2 with carbonization of paper, T1 in oil (stray gassing), T1 with cooking of paper, corona PD (before inspection or without inspection yet). -with low gassing just before failure, of D1/D2 in paper, T3/T2 in paper. Cases of faults in LTCs: -cases of gassing of LTCs outside of normal zone (e.g., in zone X3 for conventional ones) but without any fault found by inspection. -same for LTCs of the MR-type. -cases (with and without faults) where the number of operations was recorded in addition to DGA. Cases with low DPs of paper: In your databases, calculate the number of cases with a low DP of paper (<250 and <200), then the number of such cases that have failed. Also provide the DGA history of failed cases. Cases of DGA in: -wind mill transformers. -transformers with high flows of oil and potential electrostatic charging tendency. Gas losses: Report cases of concentrations decreasing with time in closed and open transformers in operation, in order to calculate gas losses. DGA in top and bottom oil: Report cases where DGA was performed in the relay gas, relay oil (or top oil), and bottom oil, following a gas alarm or similar event. Stray gassing of oils: Report new stray gassing data that you may have, particularly for silicone oils. Evaluation of commercial DGA interpretation software: -report your evaluation of the software developed in Hungary ( and in Vietnam: -report if you have access to commercial software (e.g., Doble, TOA, TOAN, Weidmann, TjH2b, etc), for evaluation by the WG. Suggestions for the revision of IEC on DGA interpretation: -which parts should be revised + changes suggested? Gas monitors: -report how many times your multi-gas monitors (e.g., from Kelman) had to be sent back to factory for recalibration or repair since you have them? -indicate if you have access to some of the new monitors on the market, e.g, the new hydrogen monitors of Weidmann, Serveron, Qualitrol.