Fortunately, these days electrical degradation is no longer a potential problem for experienced arrester manufacturers. This is because, due to permanent connection to the line, a gapless MO arrester can theoretically suffer thermal runaway after excessive energy input or due to deterioration of its non-linear voltage-current-characteristic. SEM images of alternative improved ZnO resistor formulations prepared with various contents of indium.Įnergy handling capability and potential electrical degradation of MO resistors has been a concern from the start. Among the most recent developments is application as indispensable energy absorbers in emerging HVDC circuit breakers (also being discussed at this 2019 INMR WORLD CONGRESS). for overvoltage protection of series capacitors in case of line fault. as in China and India for 1100 kV), HVDC arresters at converter stations (of which valve protection arresters are the most important), distribution and transmission line arresters, with and without a series gap, up to the highest system voltages, huge arrester banks in Flexible AC Transmission Systems, e.g. Examples are multi-column UHV station arresters for systems above 1000 kV (e.g. Transmission line arresters at line entrance to protect open breaker.įollowing virtually complete replacement of the former gapped silicon carbide (SiC) arrester technology, new MOV arresters have expanded beyond ‘simply’ overvoltage protection at substations to include important new applications. Progress has also been achieved when it comes to significantly improved performance of MO resistors, helping to make arresters among the most reliable components found today in any electrical power system. This has since become state-of-the-art in distribution and now increasingly widely applied in transmission systems. For example, by the mid-1980s in the case of distribution class and by the early 1990s in the case of high voltage station class, MO arresters were among the first power system apparatus equipped with polymeric insulation. Nonetheless, these have undergone rapid development during the past three decades. As such, gapless MO arresters are comparatively young devices with only short service history. The first test standards on these novel devices were published only around 1990. World’s first installation of MO surge arresters at Hayato Substation in Japan. Gapless Metal-Oxide (MO) arresters came to market in 1975, after the serendipity discovery of ZnO resistors by Matsushita Electric Industrial in 1968 and subsequent intensive development towards overvoltage protection devices for application on electrical power systems. His most recent research activities in the field of surge arresters have been on energy handling capability and on optimization of external grading systems for UHV arresters. He is member of several IEC, IEEE & CIGRE Committees and is Chairman of IEC TC37 (Surge Arresters) as well as Convenor of IEC TC37 MT4 – the maintenance team responsible for all high-voltage arrester test standards. Since then he has been full professor in high-voltage engineering at one of Germany’s leading academic institutions in high voltage power engineering – Technische Universität of Darmstadt. Hinrichsen worked with Siemens from 1989 to 2001 in the position of R&D Director of the Surge Arrester Division. One of the world’s leading experts and opinion leaders in the field of surge arresters, Dr. Attend the 2019 INMR WORLD CONGRESS this October in Tucson, Arizona to hear a landmark presentation by Professor Volker Hinrichsen.
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