The insulation applications of ethyl silicone oil in electrical equipment are mainly due to its excellent dielectric properties, chemical stability, and wide temperature range adaptability. The following is a detailed analysis:

1. Insulation Characteristics of Ethyl Silicone Oil
Dielectric Properties: Ethyl silicone oil possesses high dielectric strength (typically >20kV/mm) and volume resistivity (>10¹⁴Ω·cm), effectively preventing current leakage and making it suitable for high-voltage environments.

Temperature Stability: Operating temperature range -60~150℃, viscosity changes little with temperature, maintaining insulation performance even in extreme environments.

Chemical Inertness: Resistant to oxidation, acid and alkali corrosion, and does not easily degrade with long-term use, extending the lifespan of electrical equipment.

2. Main Application Scenarios
Transformer Insulation: As a transformer oil filling medium, it can reduce equipment size, increase power density, and suppress partial discharge. For example, after using ethyl silicone oil in a 500kV transformer, the insulation resistance stability was significantly better than that of traditional mineral oil.

Cable Insulation: Used for impregnation or coating of high-voltage cables, providing corona resistance and moisture protection, especially suitable for humid underwater or underground environments.
Electronic Component Encapsulation: Low-viscosity ethyl silicone oil is used as a potting material to protect circuit boards from moisture and dust, and to dissipate heat.

3. Advantages Compared to Other Insulation Materials
Properties:                         Ethyl Silicone Oil                                Mineral Oil                                     Polypropylene (PP)
Dielectric Strength:              High (>20kV/mm)                             Medium (15-18kV/mm)                   High (but susceptible to strain)
Temperature Range:            -60~150℃                                        -30~120℃                                   -40~100℃
Chemical Stability:               Excellent                                          Average (easily oxidized)                  Good (but requires modification and toughening)
Environmental Protection:    Non-toxic，recyclable                        Difficult to degrade                           Recyclable

4. Typical Cases and Research Progress
Transformer Application: TBEA has solved the problem of decreased insulation resistance caused by the aging of traditional oils through optimization of ethyl silicone oil.
Cable Technology: A team from Xi'an Jiaotong University composited ethyl silicone oil with polypropylene, increasing the elastic limit strain of cable insulation to 5.4%.
Electronics Industry: Vinyl-terminated silicone oils, due to their low viscosity, are widely used for potting precision electronic components.

Ethyl silicone oil, with its comprehensive performance advantages, has become a key material in the field of electrical equipment insulation, and has great potential in new energy equipment, smart grids, and other scenarios in the future.