Patent ID: 9716407
Date: 2017-07-25
CPC Classifications: H02J,Y02B,Y04S

Claim:
1. A method for disconnecting a local power distribution grid from a superordinate power supply grid, wherein the local power distribution grid and the superordinate power supply grid are connected by a grid disconnection device comprising at least two series-connected switching elements, each of the at least two series-connected switching elements having assigned switching contacts, wherein a switching contact of a first of the at least two series-connected switching elements is connected to the superordinate power supply grid, and at least one local power supply device is provided in the local power distribution grid, the at least one local power supply device comprising an island detector configured to detect an island situation of the local power distribution grid, an internal switching element for disconnecting the at least one local power supply device from the local power distribution grid, a control contact of a second of the at least two series-connected switching elements is connected to the superordinate power supply grid, comprising: monitoring the local power distribution grid for a presence of an island situation using the island detector; opening the second switching element by signaling the control contact thereof, and disconnecting the local power supply device from the local power distribution grid using the internal switching element to open the first switching element.