Transformer

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Cosine Dry Type transformers are rated 600V and below for supplying appliances, lighting and power loads from electrical distribution systems, capacity rating are available from 5 to 1500 KVA, standard distribution voltages are 480V and 240V; standard load voltages are 480V,380V,240V,208V, and 120V. Custom voltages are also available for special applications.

The transformer is used to match the load voltage to the distribution voltage. Since no vaults are required for installation and they are housed in free standing enclosure, these transformers can be located right at the load to provide the correct voltage for the application. This eliminate the need for long, costly low voltage feeders.

Cosine transformers are designed, manufactured, and tested in accordance with all applicable NETA/ANSI/NEMA & IIEE standards.

All Cosine transformers are designed for continuous operation at rated KVA, 24 hours a day, 365 days a year.

Core and coil

Transformer cores are constructed with high grade, non-aging, grain oriented silicon steel with high magnetic permeability and low hysteresis and eddy current losses. Maximum magnetic flux densities are substantially below the saturation point. The core volume allows efficient transformer operation at ten percent (10%) above the highest tap voltage. The core laminations are tightly clamp and compressed. Coils are wound of electrical grade fiberglass-coated aluminum with continuous wound construction. The coil assembly are impregnated with a non-hydroscopic thermo setting varnish and cured to reduce hotspot and seal out moisture.

Low core loss and winding losses are thus guaranteed.


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