Table 3 Health status based on gas levels (in ppm)
From: Transformer faults in tanzanian electrical distribution networks: indicators, types, and causes
Condition | Gases | ||||||||
|---|---|---|---|---|---|---|---|---|---|
CO2 | H2 | CO | CH4 | C2H6 | C2H2 | C2H4 | \({\mathrm{H}}_{2}\mathrm{O}\) | TDCG | |
Normal | < 2500 | < 100 | < 350 | < 120 | < 65 | < 1 | < 50 | < 20 | < 700 |
Caution | 2500–4000 | 100–300 | 350–900 | 120–400 | 65–100 | 1–7 | 50- < 100 | 20–37 | 700–900 |
Warning | 3000–7000 | 300–700 | 900–1400 | 400–600 | 100–150 | 7–35 | 100 | 37–50 | 1900 |
Critical | > 7000 | > 700 | > 1400 | > 600 | > 150 | > 35 | > 100 | > 50 | > 1900 |