Patent ID: 11955792
Assignee: FRAUNHOFER GESELLSCHAFT ZUR FÖRDERUNG DER ANGEWANDTEN FORSCHUNG E.V.
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H  G  Y | IPC H

Claim 0:
1. A method for protecting at least a part of a network segment of an electrical power distribution network which comprises one or more line arrangements which are each connected to a supply device for supplying electrical energy to the respective line arrangement at one or more supply regions via a line protection device for protecting the respective line arrangement, each line protection device comprising a receiving device, a triggering device and a disconnecting device, wherein one or more intermediate feeding device for feeding intermediately fed electrical energy into the respective line arrangement and/or one or more electrical loads are connected to at least one of the line arrangements, wherein at least one of the intermediate feeding device and/or at least one of the electrical loads comprise a voltage dip detection device and a signal generation device, the method comprising:
detecting voltage dips at the intermediate feeding devices and/or at the electrical loads of the line arrangements by means of the voltage dip detection devices;
generating and feeding an electrical signal into the respective line arrangement by means of the signal generating device at each of the intermediate feeding device and at each of the electrical loads at which one of the voltage dips is detected, the electrical signal or the electrical signals comprising one or more frequencies different from a network frequency of the network segment;
receiving the electrical signal or the electrical signals via the line arrangements by the receiving devices of the line protection devices;
detecting electrical faults on the respective line arrangement of the respective line protection device using the electrical signal received by the receiving device of the respective line protection device or the electrical signals received by the receiving device of the respective line protection device by means of the triggering device of the respective line protection device; and
triggering the disconnecting device of the line protection device of the line arrangement, at which one of the electrical faults is detected, by the respective triggering device so that the respective line arrangement is electrically disconnected from the respective supply device.