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PropertyNBR (Nitrile)Silicone RubberViton (FKM)Cork RubberTemperature Range-30°C to 100°C (up to 120°C)-60°C to 200°C-20°C to 250°C-20°C to 100°COil ResistanceExcellent (good with mineral oils)Moderate (less resistant to oils)Excellent (resistant to oils, fuels, chemicals)Moderate (may degrade with oils)Chemical ResistanceGood with hydrocarbons, oilsGood with ozone, weather, waterExcellent with acids, chemicals, solventsModerateElasticityGoodExcellent (flexible, soft)Moderate to goodGood but less elasticAging ResistanceModerateExcellent…

Pollution Levels (as per IEC/IEEE 60815-1 Standard) The IEC/IEEE 60815-1 standard defines four general pollution severity levels: Pollution LevelDescriptionEquivalent Specific Creepage Distance (mm/kV)LightAreas with low industrial pollution, occasional rain≥16MediumAreas with moderate pollution from industry, agriculture≥20HeavyAreas with frequent condensation, high industrial pollution≥25Very HeavyCoastal or desert areas with salt spray, conductive dust≥31 Note: Values are based on phase-to-ground…

Determining a transformer bushing typically involves selecting or designing a bushing that meets the electrical, mechanical, and thermal requirements of the transformer. It’s not about a single formula, but rather a design process based on key parameters. Below is a structured breakdown: 1. Electrical Rating Calculation This defines the voltage insulation level and current carrying…