Envirotran three-phase pad-mounted transformers

Base rating

45-12,000 kVA

FR3 fluid

Triple equipment lifetime with increased fire safety, overload capability

Voltages

Primary up to 46,000 V; Secondary 208-24,900 V

Cargill's FR3 dielectric fluid provides superior transformer performance, safety and environmental friendliness.

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Core features

Increased overload capability
High-level of fire safety with unprecedented track record of zero fire incidents
Triple the equipment longevity of a comparable mineral oil transformer
Readily biodegradable and non-toxic high fire-point transformer fluid
FR3 fluid provides sustainable performance at a low cost
Fluid conforms to ASTM D6871-03 and to IEEE PC57.147
Compartmental type transformer designed to meet exact customer specifications

The safer, environmentally friendly choice

Utilizing FR3 high-fire-point dielectric fluid, Eaton's Cooper Power series three-phase pad-mounted transformers enhance fire safety while providing environmental benefits. Because the fluid is readily biodegradable and non-toxic, FR3 fluid provides sustainable performance at a low cost.

Increased transformer reliability and lifespan

Eaton's Cooper Power series Envirotran three-phase pad-mounted transformers have been enhanced insulation lifetime tested to nearly triple that of a comparable mineral oil transformer. They offer lowered overall asset cost while boasting increased overload capability.

Low risk, high reward

With an expanded range of applications that outperform conventional transformers in all facets, Envirotran three-phase pad-mounted transformers offer a high degree of power quality and reliability with minimal additional cost.

Specifications

Ratings

Base kVA at 75 AWR	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)
Primary voltage	2400 V to 46,000 V
Secondary voltage	120 V to 24,940 V
Basic Impulse Level (BIL)	30 kV to 250 kV
Additional forced-air ratings	+15%, +25%, +33% to Base kVA

Standards

ANSI/IEEE	C57.154, 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 – available for most ratings

Enclosure

Layout	Compartmental type
Tamper resistance	Three-point latching and padlock system with recessed 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

Key features

Distribution transformer	3-phase pad-mounted
Install location	Indoor & outdoor
Power direction	Step-down and step-up

Download Links

Brochures

Commercial and industrial medium-voltage electrical distribution products brochure

This brochure outlines Eaton’s Cooper Power series broad commercial and industrial medium-voltage transformer, switchgear, fuse, sectionalizer, switch, regulator, tool, OEM equipment, cable accessory, lightning arrester, power capacitor and recloser offerings.

(PDF 2 MB , 01/24/2023)

Installation instructions

2020 NEC Requirement Guidelines for the Installation of Listed Less-Flammable Liquid-Filled Transformers

These guidelines represent Eaton's understanding and interpretation of the National Electrical Code, UL Classification of Envirotemp FR3 Fluid and FM Global Property Loss Prevention Data Sheets 5-4 - Transformers, Approved Transformer Fluids Standard 6933, FM Approved Transformer Standard 3990 and IEEE standards in effect at the time of this publication. It does not necessarily represent the position of Eaton on the protection and installation of less-flammable transformers.

(PDF 570 KB , 10/10/2021)
Three-phase pad-mounted compartmental type transformer installation and maintenance instructions

These instructions have been prepared to assist qualified technicians in the installation, operation and service of Eaton's Cooper Power series three-phase pad-mounted compartmental type transformers.

(PDF 1 MB , 08/01/2015)

Product specification guides

Liquid-filled, medium-voltage AR-VFI pad-mounted transformer specification

This is a CSI formatted construction guide specification for liquid-filled, medium-voltage AR-VFI pad-mounted transformers.

(DOCX 328 KB , 02/13/2025)
Liquid-filled, medium-voltage pad-mounted transformer specification

This is a CSI formatted construction guide specification for liquid-filled, medium-voltage pad-mounted transformers.

(DOCX 315 KB , 02/13/2025)
Liquid-filled, medium-voltage S-VFI pad-mounted transformer specification

This is a CSI formatted construction guide specification for liquid-filled, medium-voltage S-VFI pad-mounted transformers.

(DOCX 327 KB , 02/13/2025)

Technical data sheets

VFI transformer vs. switchgear information

This technical document discusses how a transformer equipped with an integral vacuum fault interrupter (VFI) can be an alternative to a non-VFI transformer in combination with stand-alone switchgear.

(PDF 57 KB , 03/01/2015)

White papers

Proper evaluation of power factor in rectangular and circular coil small power transformer designs white paper

This paper will explore the differences between rectangular and circular coil designs as they relate to power factor and establish acceptable values for each.

(PDF 214 KB , 05/28/2021)

TransFusion Coordination Program

This free, web-based, easy-to-use coordination tool makes transformer fuse selection effortless. By simply inputting a few pieces of data fields and selecting the desired level of protection, you can quickly find the right Eaton's Cooper Power series ELSP, MagneX Interrupter or Bay-O-Net fuses for your application. The TransFusion Coordination Program provides you the flexibility of trying various combinations before deciding on the one that best fits your application needs. A simple click of the print button allows you to print your TCC curves and part numbers.

Coordinate device protection

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