Testing result | Aging state | Next detection time |
tanδ ≤ 1.2 × 10−3 | No aging | 5 years later |
1.2 × 10−3 ≤ tanδ ≤ 2.2 × 10−3 | Slightly aging | 1 year later |
2.2 × 10−3 ≤ tanδ | Severly aging | Normally |