Particularly for protection against accidental arcs, EVS trust in ABB technology and know-how, since any arc occurring has fatal consequences in the open-air installation at Biberach: the entire installation is affected, the expense of cleaning is huge, and the outage can be as long as ten hours.

The TVOC arc-monitoring protection system from ABB Switchgear and Control-gear Engineering is used at EVS to maintain and increase availability of the installation. Six arc monitors with 40 detectors monitor the continuity of the power supply. In addition, the arc monitors are combined with two current-monitor relays. Not only is spurious tripping reliably prevented, in particular, selective disconnection of parts of the installation is possible. The area of gear affected by the arc can be isolated within 60 ms; the remaining areas of the installation remain in service - for an undisturbed power supply in the district.