| NO. | Volt (kV) | A | B | C | Conclusion | ||||
| Tanδ (×10−4) | Ratio | Tanδ (×10−4) | Ratio | Tanδ (×10−4) | Ratio |
| |||
| 15 | 6 | 5.37 | 0.205 | - | - | - | - | A middle aging | |
| 8 | 5.46 | 0.227 | - | - | - | - | |||
| 27 | 6 | 3.36 | 0.089 | 3.76 | 0.095 | 3.83 | 0.071 | ABC slightly aging | |
| 8 | 3.46 | 0.082 | 3.70 | 0.090 | 3.49 | 0.066 | |||
| 28 | 6 | 4.13 | 0.152 | 4.12 | 0.102 | 4.99 | 0.133 | ABC slightly aging | |
| 8 | 3.76 | 0.141 | 3.89 | 0.092 | 4.79 | 0.113 | |||
| 34 | 6 | - | - | 3.66 | 0.075 | 3.63 | 0.051 | BC slightly aging | |
| 8 | - | - | 3.74 | 0.104 | 3.77 | 0.049 | |||