Cast Resin Dry Transformer 1250kva 22 to 0.4 Kv

The cast resin dry transformer 1250kva 22 to 0.4 kv, which produced by Wenzhou XiFa electric Power Equipment Co., Ltd, is a type of transformer with low loss and low noise. The dry type transformer has a reasonable structure, uses good quality materials, has a scientific design, and exquisite craftsmanship. Its rated power is 1250 kva and it adopts the AN or AF cooling method. The primary voltage is 22 kV, the tap range is ±2×2.5%, the secondary voltage is 0.4 kV, and it forms a Dyn11 vector group.

Transformer Workshop

Substation Workshop

Panel Workshop

Wenzhou XiFa could more than 45 EA of cast resin dry transformer 1250kva 22 to 0.4 kv within 40 days. The company promised each dry type transformer is produced and tested as requirements from the BOQ of terminal users.

Casting Mould

Casting Winding

Finished Product

The cast resin technology provides excellent insulation and environmental protection performance. Combined with the foil winding technology inside the resin, it creates a dry type transformer with excellent dielectric properties and short circuit tolerance, ensuring long term reliability in power distribution and special application fields. The cast resin dry transformers 1250kva 22 to 0.4 kv can use aluminum windings or copper windings, and can be equipped with F class or H class insulation systems. Different enclosures can be designed according to indoor or outdoor installation requirements.

The cast resin dry transformers characters:

The general specification of 1250kva 22 to 0.4 kv cast resin dry transformers is listed as the below:

1. Explosion proof, pollution free, and non toxic.

2. High moisture resistance, capable of operating safely in humid environments and other harsh conditions without the need for wet removal process.

3. High overload capacity, capable of operating under AF cooling conditions even when exceeding the rated load value by a certain proportion.

4. The installation cost is low and it offers excellent value for money. Compact structure, elegant appearance

5. Performance and technical parameters comply with GB, IEC or industry standards.

Testing Center

Test Waiting Area

Transformer under testing

Technical parameter:

The cast resin dry transformers Features:

This cast resin dry transformers 1250kva 22 to 0.4 kv adopts F class insulation. Its maximum allowable hot spot temperature is 155℃ and the temperature rise limit is 100K. The long term load capacity is essentially determined by thermal balance and the insulation thermal aging life.

Foil Winding Machine

Winding Machine

Casting Machine and Oven

When operating in the AN natural air cooling mode, the heat dissipation capacity of cast resin dry transformers 1250kva 22 to 0.4 kv is limited and the temperature can only be maintained within the limit at 100% of the rated load. However, if it operates in the AF forced air cooling mode, the cooling air volume significantly increases, effectively removing the additional copper loss heat generated by overloading of the windings.

According to the GB/T 1094.12 load guidelines, under standard conditions of an ambient temperature of ≤40℃ and an altitude of ≤1000m,the cast resin dry transformers 1250kva 22 to 0.4 kv under AF mode can keep the winding temperature rise within 100K at 130% of the rated load (1625kVA,) with the hot spot temperature not exceeding 155℃. This fully utilizes the cooling margin and avoids accelerated insulation aging due to long time over temperature.

However, if the cast resin dry transformers 1250kva 22 to 0.4 kv exceeds 130% for a long time, the losses and temperature rise will increase in a quadratic manner. The risk of the hot spot exceeding 155℃ will increase significantly, which seriously shortens the transformer's design life and endangering operational safety.