Envirotran solar three-phase pad-mounted transformer

Medium-voltage transformers

Eaton’s Cooper Power series Envirotran solar and energy storage transformers are designed for solar photovoltaic and energy storage medium-voltage applications. Friendlier to the environment, these pad-mounted transformers are filled with biodegradable and sustainable FR3 dielectric fluid, which also provides enhanced fire protection and a longer lifespan. Available in 45 through 12,000 kVA ratings, these solar and energy storage transformers may also be customized with a variety of site-specific characteristics to optimize safety and system integration.

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Overview Technical Resources

Available ratings

Base 45 - 12,000 kVA; Medium-voltage 2.4 - 46 kV; Low voltage 120 V - 14.4 kV; Bi-directional power flow

Solar transformer deployment leader

Field proven results

Customer focus

Industry-leading quality, design flexibility, technical support and after sales support

Core features

FR3 dielectric fluid provides fire safety, equipment reliability and a projected lifespan well beyond that of a traditional mineral-oil transformer making it a key component in balance of system (BOS) distributed energy resources (DER) solutions
Custom optimized transformer designs for specific loading profiles, impedance requirements, and single or multiple inverter connections
Increased overload capability above nameplate without loss of insulation life
Eaton's Cooper Power series transformers are built with Eaton manufactured bushings, medium-voltage connectors, arresters, loadbreak switches, tap changer switches and fusing allowing full technology and supply chain integration
Fully complements other Eaton solar/energy balance of system (BOS) solutions including DC and AC combiners, disconnects, fuses, breakers and AC recombiners, padmounted switchgear, pole-mounted reclosers, air switches, capacitors and a full offering of services

Solar AC collection system: field installation

This video demonstrates how quick and easy it is to install Eaton's close-coupled low-voltage throat connection between a typical 2500 kVA pad-mounted transformer and low-voltage AC recombiner switchboard.

Increased transformer reliability and lifespan

Filled with FR3 fluid made from soybeans, Eaton's Cooper Power series Envirotran solar transformers are friendlier to the environment, non-toxic and non-hazardous. With a carbon-neutral footprint, FR3 fluid substantially extends transformer insulation life, while enhancing overall system reliability and performance.

Customize your transformers

Eaton can help you create a customized transformer based on site-specific characteristics including loading profile, temperature profile, site altitude and required system life. Transformer low voltage bushing locations can be customized for all models of solar/energy storage central or string inverters and allow for cabled or close-coupled connections.

Superior overload capability

Eaton's Envirotran solar cooling system provides unparalleled protection, enabling transformers to tolerate greater overloads for longer periods without abnormal loss of insulation life.

Specifications

Ratings

Base kVA	45 kVA to 12,000 kVA
kVA increase at 65/75 AWR	+12% (max rating up to 13,440 kVA)
kVA increase at 55/75 AWR	+22% (max rating up to 14,640 kVA)
Medium (high) voltage	2400 V to 46,000 V
Low voltage	120 V to 14,400 V
Basic Impulse Level (BIL)	30kV to 250kV
Additional forced-air ratings	+15%, +25%, +33% to base kVA

Standards

ANSI/IEEE	C57.12.00 and C57.12.34
CSA	C227.4
NEMA (sound level)	NEMA TR-1
Third-party approval/recognition	FM Global (Indoor & Outdoor), UL/cUL Listed/classified

Enclosure

Layout	Compartmental type
Tamper resistance	Three-point latching and padlock system with recessed and penta-head bolts
Enclosure integrity	Meets or exceeds ANSI/IEEE C57.12.28 and C57.12.29 (if stainless construction)
Material	Mild or stainless steel (304L)
Enclosure environment	Indoor and outdoor
Insulating medium	Air
Close-coupling	Low-voltage throats available
Special tank	Designed and braced to withstand daily pressure and vacuum cycling
Mounting	Can be designed for skid or on-site integration

Key features

Distribution transformer	Three-phase pad-mounted
Install location	Indoor and outdoor
Power direction	Bi-directional (step-up and step-down)

Options

Electrostatic shield	Filters electrical noise produced by power electronics
Multi-winding coils designs	Three winding LHL and four winding designs to allow for multiple inverters connected to one transformer while meeting impedance requirements
Arc flash safety features	External visible loadbreak switch, side-mounted gauges and drain valve, and side-mounted LV bushing options, Infrared (IR) windows

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Eaton is an intelligent power management company dedicated to improving the quality of life and protecting the environment for people everywhere. We are guided by our commitment to do business right, to operate sustainably and to help our customers manage power ─ today and well into the future. By capitalizing on the global growth trends of electrification and digitalization, we’re accelerating the planet’s transition to renewable energy and helping to solve the world’s most urgent power management challenges.

Envirotran solar and energy storage three-phase pad-mounted transformers