Pulse circuit for providing a fault current in a DC voltage power supply grid
AssigneeSiemens Aktiengesellschaft
InventorHubert Schierling
Life of this patent
Estimating the term…
Abstract
Electrical devices are connected to a DC voltage power supply grid being connected to a power source and having a supply voltage. Protection devices protect the electrical devices against an unintentional overcurrent sensed by a sensor unit. The protection devices disconnect the electrical devices from the DC voltage power supply grid when an overcurrent is detected. A pulse circuit having a capacitor with a semiconductor switching element connected in series with the capacitor is connected to respective inputs of the protection devices and supplies an amount of electric charge when a voltage dip occurs, wherein the amount of supplied electric charge is determined based on the detected overcurrent and a predetermined time period.
Claims12
A DC voltage power supply grid for electrically coupling at least two electrical devices to an electrical power source connected to the DC voltage power supply grid having an electrical DC supply voltage, comprising:
- a protective device having a sensor unit and a switching unit which are arranged between a respective one of the at least two electrical devices and the DC voltage supply grid for protecting the respective electrical device against an unintended overcurrent, with the switching unit being designed to deactivate a device connection between the DC voltage power supply grid and the respective electrical device when an unintended overcurrent has been detected,
- a pulse circuit connected to an input of the protective device for discharging a predefined electrical charge stored in a capacitor of the pulse circuit when the electrical DC supply voltage dips, wherein the predefined electrical charge is determined as a function of the unintended overcurrent and a time required for discharging the predefined electrical charge, and
- a first semiconductor switching element connected in series with the capacitor.
A method for electrically coupling at least two electrical devices to a DC power supply grid connected to an electrical power source and having a predefined electrical supply voltage, comprising:
- protecting the at least two electrical devices against an unintended overcurrent by arranging respective protective devices between the DC power supply grid and respective ones of the at least two electrical devices,
- detecting with a sensor unit disposed in a respective one of the protective devices a respective electrical current and disconnecting the respective electrical device from the DC power supply grid with a switching unit when an unintended overcurrent has been detected,
- discharging a predefined electrical charge from an electrical charge stored in a capacitor of a pulse circuit when a voltage detected at an input of the respective protective device dips below the supply voltage, wherein the discharged electrical charge is determined at least as a function of the unintended overcurrent and a predefined period of time required for discharging the predefined electrical charge, wherein the capacitor is connected in series with a semiconductor switching element.
Dependencies are inferred from the claim text.