35kv 1250 kva iron core oil immersed transformer

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1) Characteristics of 35kv 1250 kva iron core oil immersed transformers

Compared with epoxy resin dry type transformers, 35kv 1250kva iron core oil immersed transformers provide more effective heat dissipation. Transformer oil circulates naturally inside the tank, which allows heat to be transferred evenly throughout the winding and core structure. In contrast, 1250kva dry type transformers rely mainly on air cooling and solid insulation materials, which generally have lower thermal conductivity and less efficient heat transfer capability.

For 35kv 1250kva dry type transformers, temperature monitoring depends on sensors embedded at fixed locations within the transformer body. Since the measuring points are limited, the monitored temperature only reflects the condition at specific positions rather than the overall average operating temperature. In cases where localized overheating occurs, the displayed value may not accurately represent the actual thermal condition of the 35kv 1250kva dry type transformer. 35kv 1250kva iron core oil immersed transformers, however, benefit from the circulation of insulating oil, which distributes heat more uniformly. As a result, the monitored temperature is generally closer to the average internal temperature of the 35kv 1250kva iron core oil immersed transformer.

Another important advantage of 35kv 1250kva iron core oil immersed transformers benefits from the recoverability of the insulation system where transformer oil can be filtered, purified, and regenerated after deterioration, which helps extend service life and maintain insulation performance. By comparison, 35kv 1250kva dry type transformers, which adopts epoxy resin cast insulation, have a solid encapsulated structure. Once the insulation material experiences aging, cracking, or thermal damage, the deterioration is irreversible. Faults occurring in the insulation system often lead to permanent damage to the entire transformer.

From a manufacturing perspective, 35kv 1250kva dry type transformers involve relatively complex production processes and usually have higher overall costs than 35kv 1250kva iron core oil immersed transformers. In addition, when 35kv 1250kva iron core oil immersed transformers reach the end of their service life, many of their materials such as copper, steel, and transformer oil can be recycled and reused. 35kv 1250kva dry type transformers, especially epoxy resin cast types, have more limited recycling potential because the resin insulation is difficult to separate and process.

2) Characteristics of 35kv 1250kva Dry Type Transformers

35kv 1250kva dry type transformers are widely used because they operate without insulating oil, which significantly reduces fire risks and lowers building fire protection requirements. In certain special environments, such as high rise buildings, underground facilities, commercial complexes, hospitals, and other locations with strict fire safety regulations, 35kv 1250kva dry type transformers are often the preferred or mandatory choice.

35kv 1250kva epoxy resin cast dry type transformers have overcome many of the limitations associated with earlier insulation materials, of which includes low thermal resistance and susceptibility to aging or cracking. With the continuous development of insulation technology, some 35kv 1250kva epoxy resin cast dry type transformers can now achieve Class H heat resistance levels, which provides excellent thermal performance under demanding operating conditions.

Compared with conventional 35kv 1250kva iron core oil immersed transformers, dry type transformers also offer several operational advantages, which include resistance to oil leakage, improved fire performance, reduced maintenance requirements, better dust resistance, and good moisture tolerance. In addition, 35kv 1250kva dry type transformers typically exhibit relatively low partial discharge levels during operation.

Structurally, 35kv 1250kva epoxy resin cast dry type transformers mainly consist of a laminated silicon steel core and epoxy resin cast windings. Insulating cylinders are installed between the high voltage and low voltage windings to strengthen electrical insulation. The winding assembly is mechanically supported and secured by spacers and fastening components designed with anti loosening features, which ensures reliable long term operation under vibration and thermal cycling conditions.

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