The new Cooper Power Systems PEAK transformers are designed to provide additional capability for managing increased loads and temporary overload capacity without accelerating loss of insulation system life when compared to mineral oil-filled transformer alternatives.

Cooper Power Systems has two options available for PEAK transformers. Both options use an advanced high-temperature insulation system, comprised of thermally upgraded kraft paper, soybean oil-based Envirotemp FR3 dielectric fluid, and an optimized core and coil design:

• For applications where a smaller footprint and a lighter transformer — capable of the same ratings as a physically larger 65°C AWR rated unit — are desired, a 75°C AWR PEAK transformer is recommended. These units will use less material and fewer gallons of dielectric fluid, resulting in a better value as well as lower related costs of handling and operating the larger transformers.

• Alternatively, when additional overload capacity is most important to manage increased loads or peaks in demand, a 65/75°C AWR PEAK transformer is recommended. These units are designed to accommodate heavier base loading for extended periods of time without accelerating loss of insulation system life. Utilities, commercial and industrial customers are now able to load PEAK transformers continuously above base kVA rating to 109% for single phase or 112% for three phase while maintaining IEEE Standard C57.91-2011 standard per unit life requirement.

PEAK transformers are filled with the biodegradable alternative to transformer oil, Envirotemp FR3 dielectric fluid, which creates a barrier against water at the surface of the insulation. This makes the thermal kraft paper in the coil windings stronger and longer lasting.

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