Integrated Transformer Health Estimation Methodology Based on Markov Chains and Evidential Reasoning
Table 4
The evaluation grades for solid insulation.
Dielectric losses
Insulation state
Hn
tgδ ≤ 1%
Good condition
3
1% < tgδ ≤ 1.5%
Moderately good
2
1.5% < tgδ ≤ 2%
Moderately bad
1
tgδ > 2%
Poor
0
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