Technical Publications & Webinars

In-depth technical papers, webinar recordings, and videos from our engineering team on winding technology, insulation systems, and machine reliability.

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White Papers

Research & Insights

Comparison of New and Old High Voltage Diamond Coil Electrical Insulation Performance for Hydroelectric Generators

A comparison of high-voltage diamond coils removed from hydroelectric generators after 38 years of service with newly manufactured resin-rich replacement coils. The original coils come from the US Army Corps of Engineers' renovation of the Chief Joseph Dam in Washington State, where 16 generator units (92,920 kVA, 13,800 V) are being rewound with new coils supplied by Preformed Windings. With the average US hydroelectric station approaching 50 years of age, the paper sets out the insulation-performance gains achievable by rewinding the fleet using coils made with modern techniques.

Read the paper (PDF)

The Real Cost of Insulation Failure

Explore the financial impact of generator insulation failure, including lost generation revenue, emergency repair costs and prolonged outages. Learn how proactive insulation maintenance and planned rewinds can help reduce operational risks and downtime.

Webinars

Recordings & Live Sessions

Webinar — Ultra-Low Partial Discharge: Preformed Windings Sets the Baseline

Our engineering team walks through the partial discharge testing programme behind every Preformed bar and coil, and what industry-leading PD levels mean for the long-term reliability of your machine.

Technical Publications & Webinars

Research & Insights

Comparison of New and Old High Voltage Diamond Coil Electrical Insulation Performance for Hydroelectric Generators

The Real Cost of Insulation Failure

Recordings & Live Sessions

Webinar — Ultra-Low Partial Discharge: Preformed Windings Sets the Baseline

In the Industry Press

When a Generator Tells You It's Time: Lessons from 38 Years of Service at Chief Joseph Dam

ESG Week 2022 — Increasing Hydro Capacity to Meet Global Demand

In Events

Comparison of New and Old High Voltage Diamond Coil Electrical Insulation Performance for Hydroelectric Generators

From the Preformed YouTube channel

The Moment Preformed Windings Officially Open Second Manufacturing Facility

See Our New Coil Measuring Laser Camera in Action

We have some BIG breaking news regarding our expansion!

High-performance De-Reeler Pay-Off stand rotating in the factory

Our 13.2kV resin rich QualCoil has another happy customer

Preformed Windings at EASA 2023 in Washington

How do you spot a HIGH-QUALITY coil?

What are we investing in this year and how much?

High-quality coils for the Hydro Industry

Thought Leadership and Innovation

High-quality coils for the Nuclear Industry

HV Windings — What is Quality?

Preformed Windings Corporate Video

Preformed Windings — 2023 Investment