Jože Pihler - Fuse application in medium voltage switchgear

Jože Pihler, Marjan Stegne,  Peter Kitak, Adnan Glotić, Bogdan Fluher, Igor Tičar, Jože Voršič

University of Maribor, Faculty of Electrical Engineering and Computer Science, Smetanova ulica 17,
2000 Maribor, Slovenia,

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Switch-fuse combinations are built in to most distribution and industrial medium-voltage switchgear cells. These fuses are responsible for protecting the distribution transformers. They are usually used to protect both voltage-transformers and auxiliary-transformers. In pole-mounted transformer substations, it is possible to combine the disconnector with the fuses (fuse-disconnector, disconnector-fuse) or the fuses only at the medium-voltage level of transformer protection. However, recently-constructed switchgear may exclude fuses. Instead of fuses, circuit-breakers with defined (usually lower) short-circuit breaking capacities are combined with protection devices that take over the role of protection. Moreover, it is possible that smaller pole-mounted transformer substations are no longer protected by fuses anymore when considering the medium-voltage level.

The purpose of this paper is to explore the roles and functions of those fuses mounted on indoor or outdoor systems, and applied for the protection of the medium-voltage level. Those other possibilities that exclude fuses for device protection for medium-voltage switchgear are also explored and analyzed.

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