Apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity, In particular choking coils (impedance) for current limitation, current flow regulation, capacitor switching, harmonic filtering, reactive power compensation and/or AC high voltage smoothing; Current-limiting reactors; Short-circuit current limitation reactors; Neutral grounding reactors, in particular for installation in large power transformers for limiting fault currents; Capacitor damping reactors; Filter reactors, HVDC reactors, in particular for transmitting large quantities of electricity over long distances, and being trunk lines between transmission networks; Shunt reactors, In particular variably adjustable shunt reactors; Thyristor shunt reactors for VAR systems; Electric arc furnace reactors; Test reactors for use in high-voltage testing laboratories; Arc suppression coils, in particular for compensating a capacitive earth-fault current and for use in earth-fault protection systems; Iron core coils, in particular dry core-type iron core coils, predominantly for use in smoothing reactors, shunt reactors and energy storage chokes; Capacitor/filter protection relays, in particular for protecting capacitive, inductive and ohmic elements of capacitor banks and harmonic filter circuits; Line traps, in particular for use in high-voltage transmission lines and for use in power-line communication systems, in particular power-line carrier communications systems

Maintenance of apparatus and instruments for conducting, switching, transforming, accumulating, regulating and controlling electricity, in particular choking coils (impedance), arc suppression coils, iron core coils, capacitor/filter protection relays and line traps

Development of apparatus and instruments for conducting, switching, transforming, accumulating, regulating and controlling electricity, in particular choking coils (impedance), arc suppression coils, iron core coils, capacitor/filter protection relays and line traps