
Column: Tap-changer know-how
Hermetical sealing of transformers and tap-changers 1. Introduction Every oil-filled electrical equipment must be able to handle a certain thermal expansion of the oil, which...
BY MLADEN Banovic, PhD, Editor-in-Chief
Hermetical sealing of transformers and tap-changers 1. Introduction Every oil-filled electrical equipment must be able to handle a certain thermal expansion of the oil, which...
Pfisterer at a glance Pfisterer is a family-owned German company, with its headquarters close to Stuttgart. We employ about 2,700 people, and our revenue is...
Company overview Oxyweld, a leading Italian manufacturer of oxyhydrogen gas generators for brazing, marked its 36th anniversary and today, thanks to its experience, supports many...
Transformer market development Demand and supply – Are they ever in balance Historical development Between 1960 and 1970 the world installed generating capacity grew...
Start in a rented workshop Huaming was founded in the 1990s. At that time, there was a great demand, but also a great shortage of...
New test technologies respond to increasing demands Reduce costs, switch to renewable energy sources, create de-centrally supplied grids, maintain high grid quality – we know...
A technical guide to condition monitoring: Where to begin? Introduction When you own a transformer, it is often challenging to decide whether you have the...
Güdel at a glance Güdel is a Swiss, family-owned company in third generation, established in 1954, which employs about 1,200 people worldwide. The company’s revenue...
The new VACUTAP® VR. Maximum performance, wide range of applications. MR’s VACUTAP® tap-changers have been used around the world in a wide variety of applications...
Transformer specification and sustainability 1. Introduction To secure the quality of the installed asset base, in this case power transformers, utilities and industries rely on...
Abstract This paper discusses DVtest or Dynamic Resistance Measurement, a new diagnostic method used in detecting on load tap changer (OLTC) operational problems, as applied...
Introduction What we refer to broadly as the “national power grid” is in fact three joined systems: the Eastern, Western, and Texas interconnections. Taken as...
Abstract Part 1 of this article, published in Volume 3 Issue 4, pages 100ff, describes the measurements of excitation, winding resistance, turns ratio and accuracy...
Abstract Skin depth and proximity effects in transformer windings are important phenomena influencing the design even at power frequencies (50-60 Hz). They become critically important...
Abstract This article investigates the generation of high harmonics in the magnetizing current of small three-phase transformers using the magnetic field analysis, the Finite Element...