Protective device, in particular a fault current protective device
AssigneeSiemens Aktiengesellschaft
InventorsManfred Kleemeier, Gerald Lehner, Reinhard Schmid
Life of this patent
Estimating the term…
Abstract
Two detection systems are provided for a protective device, in particular an FI protective device, having a core balance transformer whose secondary winding is followed by a tripping relay for operating a switching mechanism, which switches a conductor network. In this case, a first detection system carries out the tripping function for fault currents at a fault current frequency below a changeover frequency. The second detection system carries out the tripping function for fault currents above the changeover frequency. The changeover frequency is in this case preferably not less than 1 kHz.
Claims21
A protective device comprising:
- at least two detection systems with a core balance transformer whose secondary winding is followed by a tripping relay for operating a switching mechanism which switches a conductor network, wherein a first detection system carries out a tripping function for a fault current at a fault current frequency below a changeover frequency, and wherein a second detection system carries out the tripping function for fault currents above the changeover frequency.
Dependencies are inferred from the claim text.