Silicone liquid in new transformers should have a power factor of what percentage or less at 25°C when tested?

Silicone liquid in new transformers is essential for ensuring effective electrical insulation and cooling. The power factor is a measure of energy loss in the insulating medium, and a low power factor indicates better insulating properties. For silicone liquids used in transformers, a power factor of 0.10% or less at 25°C is typically specified, as this level indicates minimal energy loss and contributes to the efficient operation of the transformer.

Testing silicone liquid at this low threshold is critical for identifying any potential issues or contaminants that could impair its insulating properties. Any significant deviation above this percentage could suggest problems such as moisture penetration or other impurities within the liquid, which could lead to increased risks of electrical failures or overheating.

Overall, maintaining a power factor of 0.10% or lower is indicative of high-quality silicone liquid and ensures reliable, safe operation in transformer applications.