| Index | Normal | Noticeable | Abnormal | Serious |
NO.1 Principle component | Tank’s oil temperature | 66, 0.6667, 0.5 | 70, 0.6667, 0.5 | 74, 0.6667, 0.5 | 78, 0.6667, 0.5 |
Winding’s short circuit resistance | 0.005, 0.00167, 0.5 | 0.015, 0.00167, 0.5 | 0.025, 0.00167, 0.5 | 0.035, 0.00167, 0.5 | |
Iron core’s total hydrocarbon content | 145, 1.6667, 0.5 | 155, 1.6667, 0.5 | 165, 1.6667, 0.5 | 175, 1.6667, 0.5 | |
Iron core’s acetylene content | 0.75, 0.0833, 0.5 | 1.25, 0.0833, 0.5 | 1.75, 0.0833, 0.5 | 2.25, 0.0833, 0.5 | |
NO.2 Principle component | Oil pillow’s sealing situation | 92.5, 2.5, 0.5 | 77.5, 2.5, 0.5 | 62.5, 2.5, 0.5 | 47.5, 2.5, 0.5 |
Iron core’s hydrogen content | 145, 1.6667, 0.5 | 155, 1.6667, 0.5 | 165, 1.6667, 0.5 | 175, 1.6667, 0.5 | |
Tap-switch’s action situation | 92.5, 2.5, 0.5 | 77.5, 2.5, 0.5 | 62.5, 2.5, 0.5 | 47.5, 2.5, 0.5 | |
Bushing’s capacitance | 0.005, 0.00167, 0.5 | 0.02, 0.00333, 0.5 | 0.04, 0.00333, 0.5 | 0.06, 0.00333, 0.5 | |
NO.3 Principle component | Winding’s absorption ratio | 1.35, 0.01667, 0.5 | 1.25, 0.01667, 0.5 | 1.15, 0.01667, 0.5 | 1.05, 0.01667, 0.5 |
Winding’s partial discharge | 0.75, 0.0167, 0.5 | 0.85, 0.0167, 0.5 | 0.95, 0.0167, 0.5 | 1.05, 0.0167, 0.5 | |
Iron core’s co2/co ratio | 5, 1.667, 0.5 | 20, 3.333, 0.5 | 35, 3.333, 0.5 | 45, 3.333, 0.5 | |
Cooling system’s fan situation | 92.5, 2.5, 0.5 | 77.5, 2.5, 0.5 | 62.5, 2.5, 0.5 | 47.5, 2.5, 0.5 |