Mathematical Problems in Engineering / 2020 / Article / Tab 4

Research Article

Integrated Transformer Health Estimation Methodology Based on Markov Chains and Evidential Reasoning

Table 4

The evaluation grades for solid insulation.

Dielectric lossesInsulation stateHn

tgδ ≤ 1%Good condition3
1% < tgδ ≤ 1.5%Moderately good2
1.5% < tgδ ≤ 2%Moderately bad1
tgδ > 2%Poor0

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