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Arnhem, The Netherlands

Erbrink J.J.,Technical University of Delft | Gulski E.,Technical University of Delft | Smit J.J.,Technical University of Delft | Seitz P.P.,Seitz Instruments AG | And 3 more authors.
IEEE Electrical Insulation Magazine | Year: 2010

On-load tap changers (OLTCs) are designed to change current from one winding tap to another without interrupting the load and without short-circuiting adjacent taps on the transformer windings. Many OLTCs installed in power transmission systems operate on only one or a limited number of tap positions for an extended time period, and this contributes to degradation of the less frequently used contacts. A routine inspection of an OLTC can involve opening the diverter switch compartment, cleaning the soot-covered insulation, and checking the diverter contacts and mechanisms, but it usually does not include inspection of the tap-selector contacts inside the transformer tank. The addition of an important element to OLTC inspection, namely checking the condition of the OLTC contacts without accessing them physically, is discussed below. © 2006 IEEE. Source


Van Overbeeke F.,EMforce | De Groot R.,Enexis | Bozelie J.,Liandon Inc. | Slootweg H.,Enexis
IET Conference Publications | Year: 2013

In the framework of an R&D project called "Smart Storage", Enexis has developed a boxed electricity storage system called the Smart Storage Unit (SSU). The SSU is a concrete housing in which a set of batteries and DC/AC converters is pre-assembled. After local installation, 50% of the SSU is below ground level. The thermal concept of the system has been chosen to minimise reliance on active cooling. This paper presents the design considerations, discusses the thermal balance on various time scales, and describes the chosen solution. Extensive functional and cyclic testing of the assembled system was performed in KEMA's Flex Power Grid Laboratory in Arnhem in March- April 2012. These tests have led to modifications on the internal air flow, which have been implemented and have been put to test in December 2012. The paper presents the results and discusses the achieved performance improvements. Source


Erbrink J.J.,Technical University of Delft | Gulski E.,Technical University of Delft | Smit J.J.,Technical University of Delft | Leich R.,Liandon Inc. | And 2 more authors.
IEEE Electrical Insulation Magazine | Year: 2011

On-load tap changers (OLTC) that are in critical condition and require maintenance can be selected on the basis of diagnostic measurement results. Resistance measurements are particularly suitable for assessment of OLTC degradation and to reveal OLTC defects that could lead to failure (see Figure 1). This article discusses dynamic resistance measurements (DRM) on OLTCs. In Part 1 of this series [1], DRM as a diagnostic method for OLTCs was discussed, and a few case studies were presented. In this part the interpretation of the results will be discussed. © 2011 IEEE. Source


Liandon Inc. | Entity website

Duiven Liandon heeft een mobiele applicatie ontwikkeld voor de DONG Energy Solar Challenge. Deelnemers en belangstellenden van het evenement kunnen op de app de Solar City Quiz spelen dat zich afspeelt in Friesland


Zuijderduin R.,Technical University of Delft | Chevtchenko O.,Technical University of Delft | Smit J.J.,Technical University of Delft | Aanhaanen G.,TenneT TSO bv | And 2 more authors.
Physics Procedia | Year: 2012

Due to increasing power demand, the electricity grid of the Netherlands is changing. The future transmission grid will obtain electrical power generated by decentralized renewable sources, together with large scale generation units located at the coastal region. In this way electrical power has to be distributed and transmitted over longer distances from generation to end user. Potential grid issues like: Amount of distributed power, grid stability and electrical loss dissipation merit particular attention. High temperature superconductors (HTS) can play an important role in solving these grid problems. Advantages to integrate HTS components at transmission voltages are numerous: more transmittable power together with less emissions, intrinsic fault current limiting capability, lower ac loss, better control of power flow, reduced footprint, less magnetic field emissions, etc. The main obstacle at present is the relatively high price of HTS conductor. However as the price goes down, initial market penetration of several HTS components (e.g.: cables, fault current limiters) is expected by year 2015. In the full paper we present selected ways to integrate EHV AC HTS cables depending on a particular future grid scenario in the Netherlands. © 2011 Published by Elsevier B.V. Selection and/or peer-review under responsibility of the Guest Editors. Source

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