Sandra Green
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Sandra GreenMember
The BDV (Breakdown Voltage) test of transformer oil measures the oil’s dielectric strength, which is its ability to withstand electrical stress without breaking down. During the test, a gradually increasing voltage is applied to the oil sample until it breaks down, or a spark occurs. A higher BDV value indicates that the oil has good insulating properties and is capable of effectively insulating the transformer’s internal components.
Sandra GreenMemberAskarel is not actually oil but a synthetic, non-flammable liquid that was historically used as an insulating fluid in transformers and capacitors. Askarel is a trade name for a group of polychlorinated biphenyls (PCBs), which were used because of their excellent fire-resistant properties. However, due to their environmental toxicity and potential health hazards, the use of Askarel and other PCB-based insulating fluids has been banned or heavily restricted in many countries.
Sandra GreenMemberThe oil capacity of a 25 kVA transformer is typically around 40 to 60 liters. The exact capacity may vary based on the design and construction of the transformer.
Sandra GreenMemberThe different types of transformer oil include:
Mineral Oil: The most commonly used type, derived from petroleum, known for its good insulating properties and thermal stability.
Silicone Oil: Used in environments with high temperature variations due to its excellent thermal stability.
Natural Ester Oil (e.g., FR3): Biodegradable and environmentally friendly, made from vegetable oils, and offers superior fire resistance.
Synthetic Ester Oil: A synthetic alternative to natural esters, providing similar benefits with enhanced performance in extreme conditions.
PCB Oil: Once widely used but now banned or heavily restricted due to its toxicity and environmental impact.Sandra GreenMemberAn oil type transformer is a transformer that uses insulating oil for cooling and insulation. The oil circulates through the transformer, dissipating heat generated by the electrical components and providing insulation to prevent electrical discharges. These transformers are widely used in high-voltage applications for their reliability and efficiency.
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