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Judgment & ambiguity · Decisions under uncertainty

Dissolved-gas analysis on a critical substation transformer shows acetylene climbing across the last two samples — a possible sign of internal arcing — but it could be a sampling or lab error, and the unit is carrying heavy summer load. Do you take it out of service or keep it running?

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Dissolved-gas analysis on a critical substation transformer shows acetylene climbing across the last two samples — a possible sign of internal arcing — but it could be a sampling or lab error, and the unit is carrying heavy summer load. Do you take it out of service or keep it running?

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