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For over 55 years, Preformed Windings has led the manufacturing of high-quality diamond coils and windings for the global hydro industry.
Our QualCoil products boast low Partial Discharge levels, optimal Tan Delta levels, extended service life, and reduced maintenance. We specialise in supporting projects for increased generation output and long service life with minimal maintenance.
As the demand to double hydropower capacity by 2050 grows, refurbishing existing facilities becomes essential. Preformed Windings offers improved diamond coils that boost output levels, extend service life, and reduce maintenance.
We actively engage with industry associations like NHA and IHA, collaborate closely with OEMs and insulation suppliers, and provide tailored solutions with round-the-clock support throughout the project lifecycle. Contact us for more information.
“Preformed Windings have supplied many sets of high voltage coils to GE Vernova over the years. The quality of product and service is exceptional, and they are a trusted partner in our supply chain. We enjoy collaborative and cutting-edge research and development with Preformed Windings, which positions both organisations as thought leaders in the hydro industry. Their products offer significant benefits such as very low partial discharge and a long service life” – Global Commodity Leader
“Preformed coils have successfully passed a rigorous set of qualification testing for Andritz Hydro. These tests included thermal cycling and voltage endurance to IEEE standards. We have had success using their coils.” – Principal Engineer
“Sidewinders LLC has used Preformed Windings for many years, and they are our preferred winding provider. Preformed Windings supplies exceptionally high quality HV diamond coils for hydrogenerators, along with 24/7 technical support. Preformed Windings’ engineers listen to each client’s needs and study the specific requirements of each project to provide precisely tailored solutions. Preformed Windings uses their position as trusted thought leaders in the industry to not simply manufacture replacement coils, but to substantially improve coil designs. Preformed Windings’ process and focus on continuous improvement results in superior machine performance that will endure for many years to come.” – President and technical director
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