Oil Immersed Transformer Insulation Grade

Jun 15, 2025 Leave a message

Insulation grade refers to temperature, not the concept of insulation strength, but the standard of allowable temperature rise, that is, insulation grade refers to the heat resistance grade of the insulation material used, which includes A, B, E, F, H, and C. Oil-immersed transformers have A grade, and the maximum operating temperature is 105 degrees, which is the oil transformer. Dry transformers have F grade (epoxy resin) with a maximum operating temperature of 155 degrees. There are also H grade (maximum operating temperature 180 degrees) and C grade (maximum allowable operating temperature 220 degrees) dry oil-immersed transformers made of NOMEX insulation materials. E and B are used to make motors. This temperature is determined by the insulation material.

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Temperature Standards For Oil-Immersed Transformers

Oil Immersed Transformer Protection Method

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Oil Immersed Self Cooled Transformer
Yuanchen oil immersed self cooled transformer is made of high-quality cold-rolled grain oriented silicon steel sheets with high magnetic permeability. It adopts a full 45° slope lamination, which can effectively reduce no-load loss and no-load current. And we have carefully designed the oil passage of the equipment, which can greatly increase the heat dissipation effect of the coil. It helps to reduce the temperature rise of low-voltage windings and improve the overload capacity of transformers. We specialize in the research, development, production, and operation of dry-type transformers of 35kV and below, modular transformers, prefabricated substations, oil immersed power transformers of 220kV and below, transmission and distribution, and control equipment. The annual output of transformers exceeds 30 million kVA.
Dry Resin Transformer
Dry resin transformer is a type of power transformer whose windings and iron core are not immersed in insulating oil, but are insulated and cooled by air or other insulating media. This type of transformer is mainly made of dry solid insulation materials, usually including epoxy resin, fiberglass, etc. Due to the absence of liquid insulation medium, it is called a dry-type transformer.
Box Type Substation
Box-type substation is a compact power equipment that integrates various equipment. It is widely used in various places such as urban living areas, industrial areas, mining areas, etc. It integrates core power facilities such as transformers, switch cabinets, and control devices in a solid metal box shell, which can make it small in size and compact in structure. Quick installation. Through the conversion of medium and high voltage electric energy, it can ensure the stable operation of the power system and meet the power supply needs of people from all walks of life.