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- W596523916 abstract "Based on the system voltages for AC and DC railway systems the required voltage ratings for modern gapless MO surge arresters are given. The origin of overvoltages occurring in railway systems are explained, and some typical figures are presented. VDV recommendation 525 gives a protection concept for railway systems with Un = 600 V and Un = 750 V DC, including requirements for MO arresters. This protection concept is becoming common praxis in other DC railway systems as well, e.g. in 1500 V DC and 3000 V DC systems. The described concept provides protection of equipment against overvoltages originating from lightning and switching. For the protection against dangerous touch voltages low voltage limiters are used. These devices, generally based on gap technology, have the disadvantage of short-circuiting when stressed with impulses due to lightning. To overcome this problem a new hybrid voltage limiter, a combination of MOsurge arrester and low voltage limiter was developed and introduced. Tests with LVLs prove that these devices go in short-circuit conditions after the first impulse stress. LVLs with claimed lightning resistance withstand impulse stresses originated by lightning phenomena. Anyhow, the discharge voltage is changing after applied impulse stresses, being then in some cases out of the declared tolerances. The hybrid voltage limiter HVL turns out to be the only device that protects against overvoltages and touch voltages and provides reliable and safe protection." @default.
- W596523916 created "2016-06-24" @default.
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- W596523916 date "2007-01-01" @default.
- W596523916 modified "2023-09-27" @default.
- W596523916 title "Protection against unacceptable voltages in railway systems" @default.
- W596523916 hasPublicationYear "2007" @default.
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