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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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