Втулки DIN

Проходные втулки трансформатора являются основными изолирующими устройствами, расположенными снаружи масляного бака трансформатора. Они служат для вывода выводов обмоток трансформатора изнутри масляного бака наружу, а также обеспечивают изоляцию между выводами и землей и фиксируют выводы на месте.  

Распространенные типы:  

– Pure porcelain bushing: Mostly used for 10kV and below, the porcelain sleeve has air insulation inside.  

– Oil-filled bushing: Mostly used for 35kV level, the porcelain sleeve is filled with oil, and the copper rod is wrapped with insulating paper.  

– Capacitor bushing: Used for high voltage above 100kV, made of an oil-paper capacitor core, porcelain parts, oil reservoir, spring, etc., with the main insulation being the capacitor core.  

Основные функции:  

– Electrical insulation: Prevents electrical breakdown between the lead and the transformer casing, oil tank, or other grounded parts.  

– Mechanical support: Supports and holds the lead in place, preventing it from loosening or getting damaged during operation.  

– Current-carrying path: Conducts load current during normal operation and withstands short-circuit current during faults.  

– Sealing protection: Fully sealed structure prevents internal insulation from moisture or contamination, extending its lifespan.  

Области применения:  

– Distribution transformers: Mostly use pure porcelain or resin bushings.  

– Medium/high voltage transformers: Mostly use oil-filled or capacitor bushings.  

– Special requirements: Can integrate a current transformer (bushing CT) for measurement and protection.