Custom Designed Transformers for Wind Farms

Custom-designed padmount transformers wind farm step-up transformer

In this case, Solomon Corporation collaborated with a wind farm customer’s team to size and design two padmount transformers that were meant to replace a couple of existing transformers that had to be removed from service.

Upon learning that the transformers the wind farm client had in use were building up combustible gasses, Solomon Corporation put the engineering team on the case immediately. The transformers feature a core and coil construction designed with a K=4 rating to compensate for the harmonic loading associated with wind generators and solid state controls. The transformers were designed with electrostatic shielding between the high and low voltage windings to prevent harmonics from passing through the transformer and onto the high voltage system. The BIL ratings on the insulation systems were increased from 150 KV to 200 KV BIL to compensate for high electrical stresses in wind farm applications. The high voltage bushings, fusing, and load break switching remained at 150 KV BIL to accommodate the standard equipment used in padmount transformers.

The transformers built by Solomon Corporation engineers also came with an expedited delivery date, so that they could quickly replace the existing transformers that had severe combustible gassing issues. For more details on the product specifications related to this case study, please see the supplemental information below. Please contact us directly to learn how we can help you with your specific requirements.

Solomon Corporation specializes in custom design and engineering for distribution transformers. We also offer repair, recycling, and disposal of surplus transformers and regulators. If you wish to contact Solomon Corporation to help you with your specific project requirements, or to request a quote, please click here to contact our sales and procurement team.

Product Description

Specially designed to withstand variable loading, system faults, harmonics, and transient over-voltages of wind farm applications.

K=4 Rating to Compensate for Harmonic Loading and Overheating
Electrostatic Shielding to Filter Harmonics
Insulation System Designed with 200 KV BIL for Over-Voltage Conditions
Braced to Withstand Mechanical Short Circuit Forces

Overall Transformer Dimensions

Length: 68″
Width: 70″
Height: 72″
Oil Capacity: 496 Gallons
Weight: 14,150 lbs

Oil Type

Inhibited Type II Mineral Oil

Product Specifications

1750 KVA @ 65 Degree C Rise
Three Phase, 60 Hertz
High Voltage Rating: 34500 Delta 150 KV BIL (200 KV BIL Insulation System)
Low Voltage Rating: 575Y/332 30 KV BIL
High Voltage Taps: +/- 5 %
K=4 Rating to Compensate for Harmonic Loading and Overheating
Electrostatic Shielding Between High and Low Voltage Windings to Filter Harmonics
Mechanically Braced to Withstand Short Circuit Forces
Two Part Epoxy Primer & 4 Mils of Acrylic Enamel Paint

In Process Testing Performed

Factory testing in accordance with ansi/ieee c57.90 Standards.

Winding Resistance and all Windings and Tap Voltages
Turn Ratio on all Winding and Tap Voltages
Polarity and Phase Relation Test
Insulation Resistance Test
No-Load Loss in Watts
Full-Load Loss in Watts
Percent Excitation Current
Percent Impedance
Applied Potential
Induced Potential


Liquid Level Gauge
Temperature Gauge
Pressure Vacuum Gauge and Bleeder Assembly
Internal Current Limiting Fusing in Series with Isolation Fuse Link

Industry For use

Wind Farm Step-Up Transformer

Standards Met

ANSI/IEEE C57.12.00 Standards

Product Name

Wind Farm Transformer

Testimonials from our customers

Solomon Corporation is the top manufacturer of high voltage power transformer sales, service, purchasing, repair and teardown services. Below are just a few examples of our work. If you would like more information on our products or services, please contact us today.

    My crew and I were having some difficulties troubleshooting a phase transformer bank. I contacted our sales rep, because not only is he very knowledgeable about the Solomon products we were working on, he’s also a very experienced lineman.

    He must have sensed my frustration with the situation because he took it upon himself to drive to another state just to see if he could help us. Shortly after his arrival, he noticed our problem, and it was quickly resolved.

    In a time when customer service is definitely on the decline, it’s good to see that some companies and their representatives are willing to go above and beyond. This is the reason that we’ll continue to buy Solomon transformers.

    Lee Sifton

    Electric Senior Foreman

    City of Eaton Rapids, MI

    “Once again, Solomon Corporation has exceeded expectations in helping Jewell Operations meet its goals. Thank you for your continuous efforts in design, delivery, and pricing. You have set the standard for how we purchase our assets. We look forward to working with you in the future as a Vendor of Choice. Job well done.”

    Rick Taylor

    Maintenance Manager

    SunCoke Energy Jewell Operations

    Redstone Arsenal is a four star command and the headquarters for Army Material Command. The base has over 40,000 employees, mostly engineers and scientist, who support critical on-going theater operations as well as a large on base NASA operation. My responsibility to keep base operations going with available power would be compromised without having reliable power and related components. Of these components, Solomon Corporation has a critical role in keeping base operations in power. Solomon has been a mainstay at Redstone Arsenal for about 20 years. The quality of the transformers are second to none as is their customer support. Solomon Corporation is the specifying standard for transformers at Redstone Arsenal and my preference over name brand original equipment manufactured transformers. My faith in the reliability and service of Solomon is unwavering and I don’t have any reservations about recommending them.

    Pete Green

    Senior Electrical Engineer
    US Army IMCOM

    On June 26th we had a fire burn down about 2.5 miles of our 25kv distribution line. We thought no big deal, we will just haul our mobile substation over there, and we’ll be back in business. This is the same mobile substation that Solomon Corporation re-worked for us a couple of years ago. Everything went smooth until we actually energized the unit and found we had no control power to the recloser control and no power to the cooling fans.
    I got on the phone with Terry Hamel on June 27th and explained our situation to him. He and Eric Carlson were on site on July 2nd to figure out what was wrong and to make it right! I think it is important to let someone at Solomon know how much I personally appreciate that kind of service! Eric and Terry dropped everything to get all the way out to Nevada and make sure we were taken care of.
    In fact, while they were here, we had another fire burn down nine of our 69kv transmission structures, and they wanted to know what they could do to help us out with that. I don’t know of too many companies that would do that.
    We are very isolated out here in rural Nevada, and it’s companies like yours that help me do my job. Everyone I have ever worked with at Solomon has bent over backwards to make sure I have gotten everything I have needed – from Grand Junction, CO to your headquarters in Solomon, KS. You should be proud of your employees.

    Michael J. Venturino

    Substation Technician
    Mount Wheeler Power

    The Solomon Crew did another great job with their recent project at the El Paso Electric Company (EPE) sites. The crews, as they did in the past project at EPE’s Newman Power Plant, showed that they worked as a team to complete the task at hand, and most importantly, they worked in a very safe manner. They showed professionalism and good work ethic from the time they arrived at EPE to the time they left. Bill and Ken, Solomon Field Leads, were in constant contact with me, providing daily updates from the different work sites throughout the duration of the project. EPE’s substation personnel did a final walk-through of the different sites upon completion of the project, and the substation supervisor was satisfied with the sites. The areas where equipment was located were left clean and free from any debris. I also received good feedback from EPE’s Safety Sitters, who were on-site for the duration of this project, on Solomon Crew’s professionalism.

    Oscar Trillo

    Environmental Department
    El Paso Electric Company

    The Clay Center Public Utilities Commissioners and I would like to acknowledge your efforts to resolve our problem. Your personnel, as usual, reacted professionally and went the extra mile to help. The transformer was back in service within four hours of my call. Having a resource like Solomon to respond to emergencies is very valuable to a utility. I will personally remember your efforts and share my thoughts with my fellow Utility Directors. Thank you.

    Bill Callaway

    Director Of Utilities
    Clay Center Public Utilities Commission

    I just wanted to say thanks for your help and support on the 500KVA transformer problem. We had a faulty transformer at a customer location. I contacted my Solomon Corporation Territory Manager while he was attending his kid’s basketball game. He returned the call, and provided the technical help we needed to troubleshoot the transformer. We found the problem and were able to get the customer up and running without expensive downtime.
    We want you to know that we appreciate the quick response and will contact Solomon when we have future transformer needs and repair.

    Russ Hogelin

    Company President
    Cahaba Electric, Inc.