Dielectrics & Electrical Insulation

Friday April 28, 2017 at 10:00 a.m. Philipp Legler will be presenting “Damped AC Partial Discharge Testing for Medium Voltage Underground Cables”. Day & Time: Friday April 28, 2017 10:00 a.m. – 12:00 p.m. Speaker: Philipp Legler Location: Megger, 550 Alden Rd Markham, ON L3R 3L5, Canada Contact: Ali Naderian Organizers: IEEE DEIS Toronto Chapter Event Abstract: Partial discharge (PD) measurements are increasingly used as a reliable and non-destructive diagnostic method for detecting weak spots in the insulation of underground cables. Partial discharge measurements are also routinely used in laboratories for testing cable reels prior to commissioning and in the field to verify installation quality. The most important factor to consider when choosing a test frequency is that the partial discharge characteristics at the new frequency must be like those at 50/60 Hz, otherwise the results cannot be reliably interpreted. This is especially true when measuring partial discharge inception voltage (PDIV), the voltage at which partial discharge first occurs. Over the past 10 years, the damped alternating current (DAC) technique has been established as a very effective method for partial discharge testing. This method is one of the voltage shapes listed for PD testing in IEEE 400.3: “Guide for Partial Discharge Testing of Shielded Power Cable Systems in a Field Environment”. In this presentation, the concept of DAC PD test will be discussed and some practical examples will be presented.

IEEE Dielectric and Electrical Insulation Ontario has arranged a facility tour of Voith Hydro Coil Factory in Mississauga on Wednesday, November 14th, 2018. Day & Time: Wednesday November 14th, 2018 12:00 p.m. ‐ 2:00 p.m. Organizers: IEEE Toronto Dielectrics & Electrical Insulation Chapter Location: 2185 N Sheridan Way Mississauga, Ontario Canada L5K 1A4 Contact: Ali Naderian, PhD., P.Eng., SM IEEE Register: https://events.vtools.ieee.org/m/177080 Abstract: Voith Hydro Mississauga has been serving many customers and all Voith Hydro locations worldwide by manufacturing coils and delivering distinctive services. The location combines both a high-tech facility, which was completely modernized in 2009, and highly experienced and specialized staff. The forward-looking decision in 1990 to relocate the old Westinghouse Hydro Generation Service to Mississauga was a great success. This helped us to innovate our products and create new jobs”, explains Peter MacLennan, COO of Voith Hydro Mississauga. Please register by Oct 2 2018 in order to attend.

On Thursday, May 14, 2020 at 1:00 p.m., Dr. Greg Stone will be presenting  “Rotating Machine Stator Winding Insulation Failure Processes”. Day & Time: Thursday, May 14, 2020 1:00 p.m. ‐ 2:30 p.m. Speaker: Dr. Greg Stone of Qualitrol Organizers: IEEE DEI Ontario Chapter Location: Virtual – Webinar Contact: Ali Naderian, DEIS Toronto Chapter Abstract: The electrical insulation used in motors and generators rated 3.3 kV and above is made from mica tapes bonded together with epoxy. The stator winding insulation is the one of the most common reasons for machine failure, and the most common reason for motor and generator maintenance. The insulation normally fails due to gradual aging of the insulation by thermal, mechanical, and electrical stresses in combination with contamination. This lecture will discuss the main insulation aging and failure mechanism both of conventional 60 Hz machines, as well as motors and wind turbine generators connected to voltage source PWM inverters. Register: RSVP is required for this event. Please visit https://events.vtools.ieee.org/m/229820 for more details and to register. Biography: Dr. Stone took his degrees from the University of Waterloo, Canada in 1975 (BSEE) and in 1991 (PhD). He began his career as an engineer working at Ontario Hydro’s Research Division. In time, he was responsible for the testing of the 1200 large motors and generators in Ontario Hydro’s system. Later Dr. Stone became one of the developers of on-line partial discharge test methods to evaluate the condition of the high voltage insulation in stator windings, used on most large generators and many large motors in North America, and now widely used around the world. Since 1990, he has been employed at Iris Power LP in Toronto Canada, a company he helped to form as a co-founder. Dr. Stone has published over 150 technical papers and has been awarded three patents concerned with rotating machine maintenance and testing. He has published two books, the latest, Electrical Insulation for Rotating Machines – Design Evaluation, Aging, Testing and Repair. An IEEE Fellow, Dr. Stone has chaired several IEEE committees responsible for creating standards for evaluation and testing of rotating machines. He is past President of the IEEE Dielectrics and Electrical Insulation Society, and continues to be active on many other IEEE committees. Other awards include the IEEE Forster Distinguished Service Award and the IEEE Third Millennium Medal. Dr. Stone is also a Fellow of the Engineering Institute of Canada. He is a registered professional engineer in Ontario.

On Wednesday, September 9, 2020 at 11:00 a.m., Cornelis Plet of DNV GL will present “Multi-Terminal HVDC Offshore Networks: Latest European Experience in Circuit Breaker Technology”. Day & Time: Wednesday, September 9, 2020 11:00 a.m. – 12:00 p.m. Speaker: Cornelis Plet Organizer: IEEE Toronto/King/Kitchener-Waterloo/Hamilton/London Joint Dielectrics & Electrical Insulation Chapter Location: Virtual – Zoom Contact: Mohsen Zadeh Abstract: The transmission of a growing amount of renewable energy resources, offshore wind in particular, can be implemented effectively and efficiently by multi-terminal HVDC transmission grids. Protection of these grids will require the interruption of DC fault currents. Traditional AC circuit breakers require current zero crossings to interrupt fault currents. The absence of this periodic current zero in DC systems has led to the development of DC circuit breakers, and entirely different approach towards interrupting DC short-circuit currents. This presentation will explain the basic operating principles of HVDC circuit breakers and different ways of implementing them in HVDC grids. Based on that, the testing challenges along with a description of a sample test circuit capable of performing all relevant electrical stresses in a one-circuit one-shot test will be presented. Finally, laboratory test results of three different types of HVDC circuit breakers will be presented and discussed. The presented information is a result of the work done in an EU-funded project (Progress On Meshed Offshore HVDC Transmission Networks or PROMOTioN for short – www.promotion-offshore.net) and coordinated by DNV GL as a partner. Register: Please visit https://events.vtools.ieee.org/m/236839 for more details and to register. Biography: Cornelis Plet is a senior consultant in HVDC Technologies & Offshore Power Systems in the Power Equipment Quality team of DNV GL’s Transmission & Distribution Technology section. He is currently technical coordinator of the European Union funded ‘Progress On Meshed HVDC Offshore Transmission Grids’ (PROMOTioN). As part of PROMOTioN, he led the development and validation of a high power HVDC circuit breaker test environment. He has extensive experience in failure investigations of cables and substation equipment. He holds an MEng in electrical engineering and a Ph.D in Fault Behaviour of Power Electronics in Power Systems, both from Imperial College London.

The course is intended for utility engineers, both young and senior, especially those responsible for condition assessment and maintenance of power transformers, manufacturers of transformers, transformer components, monitoring systems, sensors, etc., students and anyone wishing to understand the scientific foundation of PD measurement, anyone interested in a deeper awareness of partial discharge measurement and interpretation and staff who are responsible for transformers and want them to be more operational and efficient. Contact: Ali Naderian Register: Please Register Directly Using Link: https://lnkd.in/dnDybDc Speaker: Stefan Tenbohlen of Stuttgart University Topic: Partial Discharge Measurement for Power Transformers- Basics Biography: Stefan Tenbohlen (M'04, S'14) received his Diploma and Dr.-Ing. degrees from the Technical University of Aachen, Germany, in 1992 and 1997, respectively. 1997 he joined ALSTOM Schorch Transformatoren GmbH, Mönchengladbach, Germany, where he was responsible for basic research and product development. From 2002 to 2004, he was the head of the electrical and mechanical design department. 2004 he was appointed to a professorship and head of the institute of Power Transmission and High Voltage Technology of the University of Stuttgart, Germany. In this position his main research fields are high voltage technique, power transmission and electromagnetic compatibility (EMC). Prof. Tenbohlen holds several patents and published more than 400 papers.

The course is intended for utility engineers, manufacturers of transformers, transformer components, monitoring systems, sensors, etc., students and anyone wishing to understand the scientific foundation of PD measurement, anyone interested in a deeper awareness of partial discharge measurement and interpretation, staff who are responsible for transformers and want them to be more operational and efficient. ttend the session if you want to get familiar with: - Principle of measurement - Types of sensors for UHF PD Measurement - Calibration of UHF sensors and measurement system - Installation of UHF sensors Co-sponsored by: Transformer Magazine Speaker(s): Dr. Stefan Tenbohlen, Virtual: https://events.vtools.ieee.org/m/285677

The focus of this presentation is the fundamental aspects of electrical insulation materials, specifically for rotating equipment - generators and large motors. This talk will cover basic components of an insulation system, material selection criteria, review of intrinsic properties as well as aging parameters. Major test methodologies and standards used in selecting and qualifying insulation systems will be discussed. It is intended that this presentation help the audience to understand the critical working aspects of electrical insulation materials. The “why” of dielectrics for their specific applications. This knowledge can aid in maintenance decision processes, equipment repair decisions, as well as educate those in the industry understand the tradeoffs in the dielectric materials selection process. Speaker(s): Dr. Nancy Frost, Toronto, Ontario, Canada, Virtual: https://events.vtools.ieee.org/m/286734

As the energy transition picks up pace, and renewables are being built in larger capacities and more remote locations, HVDC transmission technologies is poised to play a vital role in integrating these clean energy resources into the existing grid. Particularly in offshore applications, the use of submarine cables means that HVDC is a preferable alternative to AC at much shorter distances than in onshore applications where overhead lines can be used. Because the power electronics used to convert AC to DC uses air as an insulating medium, offshore HVDC converter station platforms are bulky and thus costly components. Compact gas insulated HVDC switchgear has recently been developed which reduces the volumetric space requirements of the HVDC switchyard by 90%, realizing up to 10% total cost savings. Unclarity and a lack of standards regarding the approach towards qualifying cable sealing end (i.e. cable termination) technology, has hampered the uptake of such GIS. CIGRE joint working group B1/B3/D1.79 has characterized the electro-thermal stresses experienced by these components, and used this as a based to compare existing test recommendations for both HVDC GIS as well as HVDC cables, to develop a recommendation towards testing HVDC GIS cable connection assemblies. This webinar will give an overview of HVDC GIS cable connection assembly technology, its applications, its thermo-electric performance, and preliminary recommendations towards dielectric testing. Co-sponsored by: Mohsen Zadeh Speaker(s): Cornelis (Cees) Plet, PhD, Virtual: https://events.vtools.ieee.org/m/343520