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Transmission of electric energy at highest voltage levels (EHV and UHV) continuously increases. The dimensioning of insulator strings and tower windows for overhead lines operating at such voltage levels in contaminated areas is mainly determined by the insulator's pollution performance, and its proper completion strongly influences line reliability, cost and maintenance procedures.

This issue of the Magazine is entirely dedicated to outdoor insulation of electric power networks. We present articles written by authors from China, Sri Lanka, Ethiopia and South Africa illustrating the states of national awareness to pollution-related problems. We also have an article from Brazil that reports on research aiming to understand and model the lightning withstand of switches and cut-out

Power girds in different countries face different types of threats and in China the threats severely affecting grid reliability were in the past large power outage accidents caused by pollution flashovers. First records of pollution flashover accidents in China can be traced back to 1950s in industrial areas in Northeast and East China. Thereafter, such accidents occurred occasionally, but after 1970s

Ceramic insulators, specifically porcelain and glass insulators, have widely been used all over the world since the 19th century [1,2]. However, when such insulators are energized and exposed to different pollution environments under different climatic and weather conditions, leakage current (LC) develops along their surfaces [3–7] and eventually cause flashovers. Various remedial measures have been

Ethiopia is nowadays in urgent need of developing a modern power grid to meet the growing demand for reliable, cost-effective and environmentally friendly transmission and distribution of electric energy. The population growth, as well as development of various industries and agricultural and mining activities, increases pollution sources and yield new types of pollutants. Ensuring the safety and reliability

Lightning discharge activity causes overvoltages in the electric power system, which may result in damage to the equipment and apparatus of the system. The lightning incidence is divided into two types: direct strikes and side strikes [1–4]. Direct strikes are lightning discharges that directly hit the line, structure or equipment, resulting in overvoltages of higher amplitudes. However, they are less

For many years Eskom has followed international guidelines in selecting transmission and distribution insulator products for use in polluted environments.

With the advent of sophisticated electronic power control systems, the power efficiencies of electric and electronic devices and machines have been improved significantly. This improvement in efficiency is quite obvious in rotating electric machines such as motors. In other words, electric or hybrid electric vehicles would not gain so great a popularity, if motors in such vehicles were driven or controlled

The following seven books are reviewed: Magnetic Field Measurement with Applications to Modern Power Grids (Huang, Q., et al; 2020); College Physics Essentials— Volume One and Volume Two (Das, J.C.; 2020); Distributed Fiber Optic Sensing and Dynamic Rating of Power Cables (Cherukupalli, S. and Anders, G.J.; 2020); Lens Design—A Practical Guide (Sun, H.; 2017); The Finite Element Method in Engineering

DEIS sponsors a series of international conferences to provide a forum for members and non-members to participate and share research results, new developments, and practical experience in the Dielectrics and Electrical Insulation fields. Some conferences are held annually, while others are bi-annual or even every 3 years. The following is a listing of these events with a description, frequency, and

The President of the IEEE DEIS, Paul Gaberson, is pleased to announce that Dr. Gary Stevens has won the 2020 Thomas Dakin Distinguished Technical Achievement Award and Dr. Masahiro Sato has won the 2020 Steven Boggs Young Investigator Award. These are the top two technical awards sponsored by the IEEE Dielectrics and Electrical Insulation Society.

AdCom manages the affairs of the IEEE Dielectrics and Electrical Insulation Society (DEIS). It is made up of 18 Members-at-Large, plus 6 ex-officio members. The DEIS Nominations and Appointment Committee is inviting nominations for President, Administrative Vice President, Technical Vice President and 6 AdCom Members-at-Large of DEIS.

Donald E. Wiesenberg, 89, died on Friday, Nov. 29, 2019 in Kingman, Ariz. A native of Fort Wayne he attended local grade schools and Central High School before entering Yale University in New Haven, Conn., in 1948. He graduated from Yale with a B.A. degree in 1952, and one day after graduation married Barbara Warwick of Sherman, Conn. One year later, he earned a Master of Arts in teaching degree from

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As a background to this editorial, a simple search on Google was done on the term “capacitor”. It resulted in 146 million hits. Modifying the search to “power capacitor” resulted in 124 million hits, “high voltage power capacitor” gave 67 million hits, “low voltage capacitor” gave 55 million hits and “medium volt­age power capacitor” gave 17 million hits.

In this issue of the Magazine the focus is on materials for energy storage. We start with an extensive review on this subject and an editorial written by Birger Drugge, who explains power capacitor design and elucidates challenges that need to be considered during manufacturing. Thereafter, limitations that are overlooked in modelling of partial discharge activity under AC excitation are discussed

Polymer dielectrics are the key component in film capacitors, which are one of the most fundamental elements in modern electronics and power systems [1–3]. Film capacitors are capable of storing energy when voltage is applied, in the form of electric charges separated by a dielectric material sandwiched by a pair of metal electrodes. Film capacitors possess the advantages of high breakdown strength

Measurements of partial discharge (PD) activity are a commonly used technique to diagnose the health of insulation material within high voltage plant. The definition of PD is relatively broad, it is generally defined as a localized or confined discharge within an insulating medium [1]. Due to the high electric breakdown strength of insulation materials, PDs typically occur within low density defects

Previous works have shown that the accumulation of space charges in insulation systems of power equipment alters the operating electric field distributions, which in turn may accelerate material degradation and eventually yield premature failures. Moreover, as the injection and extraction of charges from electrodes and their migration are affected by temperature, it is, therefore, predicted that the

The completion of installation and the commencement of operation of a new high-voltage (HV) DC power interconnection system connecting between two major islands in Japan, Honshu and Hokkaido, using cross-linked polyethylene (XLPE) insulated cables, was reported in “News from Japan” in the November/December issue of the Electrical Insulation Magazine [1]. As a continuing article, the outline of a 400-kV

Electrical insulation systems are key elements of low, medium and high voltage (HV) equipment determining the operational reliability. The modern constructions of high voltage electric insulating systems must meet high standards of electrical, thermal, mechanical and chemical endurance. Further, the trends towards stronger, smarter and greener grids enforce the need for adequate diagnostics and monitoring

This monogram describes essential details of crystal structure and growth, mechanical properties, thermal properties, optical properties, and light scattering properties of diamond and sapphire materials. It focuses on the physical properties of these two materials by providing descriptions for each property and graphical data. The data provided describes the physical property over a range. For example

DEIS sponsors a series of international conferences to provide a forum for members and non-members to participate and share research results, new developments, and practical experience in the Dielectrics and Electrical Insulation fields. Some conferences are held annually, while others are bi-annual or even every 3 years. The following is a listing of these events with a description, frequency, and

Wide band gap (WBG) semiconductors are delivering on the promise of higher power and energy density circuits. In doing so, they are also opening an opportunity for a new generation of dielectric materials. Researchers from the University of Texas at Austin organized a 1.5 day workshop on "Next-generation dielectric materials for microelectronics/electrical applications" at the Massachusetts Institute

Fellowship in IEEE is intended to recognize major contributions to engineering, science, and technology, of significant value to society. No more than 0.1% of total membership may become fellows in any given year. Senior members who have been members of IEEE for at least five years may be nominated for fellowship. The nominator prepares the appropriate forms, determines the IEEE Society or Technical

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Greetings fellow DEIS members. It will be my honor to serve as your president during 2020. I want to thank the members of the Administrative Committee for putting their trust in me and I would also like to thank our past president Reimund Gerhard for his help and guidance over the last 2 years of my apprenticeship. I should also note and apologize for the fact that my initial presidential editorial

This issue of the Magazine brings a series of articles dedicated to insulation systems of electrical machines.

Partial discharges (PD) are small electrical discharges that occur within voids within the stator winding insulation system of a hydrogenerator. PD is harmful to the insulation: the repeated bombardment of electrons and ions on the void's surface gradually ruptures the chemical bonds of the insulation's organic materials and leads to electric treeing or electric tracking. In typical stator insulation

Large power generators, especially hydropower generators with a few hundred megawatts power and a few ten kV voltages, have high inertial power while operating, so they must not only withstand the operating torques and forces during operation, but also the transient forces that may arise at the time of failures, while also taking into account economic considerations. It is worth mentioning that for

As mentioned in a recent editorial in this magazine [1], distributed generation (renewables), automotive and, in general, transport and industrial utilization are fast changing the structure of electrical assets as well as the typologies and design of electrical apparatus. This is due mostly to the more widespread use of renewable generation and the electrification of transport, including power electronic

Polyimide (PI) is an important insulation material due to its high thermal, chemical and electrical resistance along with good mechanical strength [1]. It has been widely used in equipment such as high voltage motors, wind turbine and aerospace craft [2].

Japan is an archipelagic country surrounded by oceans. This means that the good use of sea would provide great advantages to Japan. One possible candidate for this is the ocean thermal energy conversion (OTEC). About half of the energy reaching the earth from the sun is absorbed by the surface of the earth or its ocean and land. Because of that, the yearly average temperature of seawater in the shallow

Nanodielectrics have garnered a considerable amount of attention and effort for nearly 20 years. The intense interest is a result of studies that have indicated material performance enhancements in both short- and long-term dielectric properties. In the DEIS (Dielectrics and Electrical Insulation Society) a technical committee was formed on nanodielectrics 10 years ago. The existence and sustainability

Power electronic drives consist of semiconductor switches arranged in a way such that the circuit can be controlled with certain gate pulse patterns to produce the desired output power waveforms. These circuits can be used to convert DC-DC, AC-DC, DC-AC, or AC-AC. Typical applications include variable speed drives for motors, both AC and DC motors (VSD), uninterruptible power supplies (UPS), Flexible

DEIS sponsors a series of international conferences to provide a forum for members and non-members to participate and share research results, new developments, and practical experience in the Dielectrics and Electrical Insulation fields. Some conferences are held annually, while others are bi-annual or even every 3 years. The following is a listing of these events with a description, frequency, and

The DEIS is seeking applicants for the position of Editor-in-Chief (EiC) of the IEEE Electrical Insulation Magazine (EIM). Potential applicants should be members of DEIS and be willing and able to carry out the duties of an Editor-in-Chief (described below) from 1 January 2021 to 31 December 2024 with a transition from the previous EiC during 2020.

The DEIS is seeking applicants for the position of Editor-in-Chief (EiC) of the IEEE Transactions on Dielectrics and Electrical Insulation (TDEI). Potential applicants should be members of DEIS and be willing and able to carry out the duties of the EiC as described below from 1 January 2021 to 31 December 2023 with a transition from the previous EiC during 2020. He or she will be expected to have relevant

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