Reactors Transformers and air cooled transformers are provided with air cored magnetically shielded or non-magnetically shielded for series/shunt application up to 2 MVAR in voltage class up to 33 KV available in ONAN type. These reactors transformers and air cooled transformers are Air cored non-shielded air-cooled type with F/H class insulation for series application is also available in single or three phase construction up to 1 MVAR in voltage class up to 33 KV.
The composition of a transformer core depends on such factors as voltage, current, and frequency. Size limitations and construction costs are also factors to be considered. Commonly used core materials are air, soft iron, and steel. Each of these materials is suitable for particular applications and unsuitable for others. Generally, air-core transformers are used when the voltage source has a high frequency (above 20 kHz). Iron-core transformers are usually used when the source frequency is low (below 20 kHz). A soft-iron-core transformer is very useful where the transformer must be physically small, yet efficient.