Technical Expertise
The expertise and efforts of Waukesha's development engineering team are focused on the needs of the industry. Many Waukesha engineers and managers are recognized industry experts, actively involved in developing National and International Standards for products related to the electrical power industry:
Sam P. Mehta — Vice President, Research & Technology, Author, Instructor, and active member of the IEEE Transformers Committee since 1970. Also, appointed U.S. Delegate to CIGRE (International Council on Large Electric Systems) Transformers Committee A2, receiving the Atwood Associate Award in July 2009. Author of NIST Technical Note 1204, “Calibration of Test Systems for Measuring Power Losses of Transformers”.
H. Jin Sim, P.E. — Vice President and Chief Technology Officer, registered Professional Engineer, responsible for the overall activities of the company's Research & Development as well as all Engineering operations, responsible for industry standards strategy and liaison, Author, Instructor and past chairman of the IEEE Transformers Committee.
David L. Harris, P.E. — Customer Technical Executive, Author, Instructor, and U.S. Delegate to CIGRE Study Committee C3 — System Environmental Performance. Also, appointed Chair — Environmental Subcommittee for the Substation Committee.
Robert M. Del Vecchio, PhD — Programmer, Research & Development. Responsible for developing computer models for simulating transformer behavior when subjected to electrical, thermal and mechanical stresses. Member of the American Physical Society, the IEEE Magnetics Society, and IEEE Power Engineering Society (PES).
Raj Ahuja, P.E. — Vice President of Technology Development responsible for Power Equipment design technology and development, Author and Instructor. Registered Professional Engineer in California and active member of the IEEE Transformers Committee and IEEE Power Engineering Society (PES). Appointed as the only U.S. delegate/expert to represent our country and all U.S.-based manufacturers, users and general interest transformer groups in the revision of the International Standard, IEC 60076-3 which centers on transformer insulation levels, dielectric tests and external clearances in air and has not been revised since the year 2000.
Thomas M Golner — Sr. Materials Engineer. Author and creator of many novel concepts that are basis of numerous patented products utilized by Waukesha and are offered to our industry. Strong background in chemistry and electrical engineering. Provides special insight into selection, utilization, development and specification of critical materials used for transformers.
William R. Henning — Design & Development Engineer, Author, and active member of the IEEE Power Engineering Society (PES) and IEEE Transformers Committee since 1979. Chairman of the IEEE Working Group on Transformer Loss Tolerance & Measurement from 1984 until 1997. Chairman of the Working Group on Load Tap Changer (LTC) Performance from 1997 to the present.
IEEE/PES Transformers Committee
Waukesha actively participates in the IEEE/PES Transformers Committee, an industry group with the following scope:
- Treatment of all matters in which the dominant factors are the application, design, construction, testing and operation of transformers, reactors and other similar equipment. Included is treatment of the following:
- Transmission and Distribution Transformers
- Voltage Regulators (step and induction regulators)
- Reactors and Grounding Transformers
- HVDC Converter Transformers and Smoothing Reactors
- Power Semiconductor Rectifier Transformers
- Instrument Transformers (voltage and current transformers)
- Insulation and Dielectric Issues Relating to Transformers
- Outdoor Apparatus Bushings
- Insulating Fluids
- Underground Transformers and Network Protectors
- Phase Angle Regulating Transformers
- Sponsorship and development (either alone or jointly with other technical committees and/or organizations) of standards, recommended practices, guidelines and policies as well as preparation of position papers and/or documents, technical conferences and/or sessions on matters related to items above.
- Liaison and cooperation with other technical committees, societies, groups and associations concerned with various aspects of items above.
Meeting Document
IEEE - IEC Transformer Standards Comparison (.ppt)
Document was prepared by the Task Force under the Standards Subcommittee of the IEEE Transformers Committee
March 2011
Task Force Chair:
H. Jin Sim, Vice President and Chief Technology Officer — Waukesha Electric Systems, Inc.
Waukesha Task Force Members:
Vinay Mehrotra, Manager of Engineering
Ajith Varghese, Senior Electrical Design Engineer
Waukesha is an IEEE Standards Association Advanced Corporate Member.
Engineering & Design Tool Advancements
Waukesha engineers are also developing various analytical and design tools to continue manufacturing reliable products efficiently and economically. These tools are used for designing production units that are highly engineered and customized to meet specific requirements of the end user's power system:
- Design Optimization programs
- Finite Element Analysis (FEA) programs
- Electromagnetic Analysis tools (for stray loss and mechanical force analyses)
- Mechanical Stress Analysis
- Heat Transfer Analysis
- Statistical Process Development (Six Sigma)
- Dielectric Stress Analysis
Patent Innovations
Waukesha Electric Systems is recognized for the development of cost effective solutions and innovative products that continue to meet the application and operational needs of its customers. Newly developed products are certified through extensive prototyping and testing before being released for production. Products built by Waukesha manufacturing, whether in Goldsboro or Waukesha, undergo vigorous routine tests to ensure that Waukesha quality, reliability and long service life are part of the package.
Examples of patented Waukesha® product innovations in production today:
DETC (De-Energized Tap Changer) Patent No. 5,744,764
DETC Operation:
The electrical contacts of the fixed DETC contact blocks are connected to different taps of the transformer allowing the turns ratio to be adjusted to meet specific voltage requirements.
To make the appropriate connection between the fixed electrical contacts, each DETC has a cylindrical movable bridging bar that is mounted on a shaft and driven simultaneously through the hollow bores of the fixed contact blocks. The solid copper bridging bar has multiple contact bands for increased current carrying capacity and short circuit strength.
Each drive shaft is connected by a mechanism to a handle mounted outside the transformer tank. The handle can be manually operated to position the movable contacts a selected distance to change the tap connections to the transformer during “off-load” conditions.
For information regarding “on-load” tap changers to automatically compensate for demand load and supply voltage fluctuations, please review the section on our reliable and field-proven Waukesha® UZD-type LTC. |
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| The patented Waukesha® Linear DETC (De-Energized Tap Changer) features a rugged, compact, non-metallic and modular switch design that allows greater flexibility of placement and increased short circuit withstand capability. It features an innovative rack and spur gear drive system that provides accurate alignment and positive tap change. |
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ARDB (Auto-Recharging Dehydrating Breather) Patent No. 5,902,381
Patented Waukesha® Auto-Recharging Dehydrating Breathers are available in single small (5000 gal. capacity), single large (12,000 gal. capacity), dual large (24,000 gal. capacity) or any combination configuration of the two for new and retrofit applications. All ARDBs are manufactured and distributed by our components division.
ARDBs keep the air inside LTCs, conservators, sealed tanks and control cabinets dry, improving equipment reliability. The ARDB has an integrated heater that drives moisture out of the desiccant and is engineered to recharge automatically, eliminating the need for periodic maintenance of the desiccant.
 ARDB Flyer (258k)
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Oil Filtration System Patent No. 6,062,821
Patented LTC Oil Filtration and Sampling System products are available for new and retrofit applications and are distributed by our components division.
For high volume LTC oil maintenance applications, a Retrofit-Plus Oil Filtration System is also available.
Retrofit & Retrofit-Plus Oil Filtration Systems Flyer (463k)
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Nitrogen Generator System Patent No. 6,581,694
The patented Waukesha® Nitrogen Generator System provides a cost effective solution for transformer oil preservation and eliminates the need to replace nitrogen bottles. The unit supplies compressed nitrogen gas at only 125 psi (instead of the traditional 2,000 psi bottle pressure), which significantly reduces the possibility of system leaks. Waukesha’s innovative Nitrogen Generator design uses state-of-the-art membrane separation technology — a concept proven over many years in other industry applications.
The Nitrogen Generator is available for new and retrofit applications and is manufactured and distributed by our components division.
Nitrogen Generator System Flyer (415k)
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