A drive system includes a current sensor configured to generate a first current signal representative of a current flowing in one or more electrical devices electrically coupled together through a power supply bus, a power output bus, and a common ground. The drive system also includes a voltage sensor configured to generate a first voltage signal representative of a voltage with respect to the common ground in the one or more electrical devices. The drive system further includes a ground fault detection controller configured to determine a ground fault in the one or more electrical devices based on a change in at least one of the first current signal and the first voltage signal.

A drive system includes a current sensor configured to generate a first current signal representative of a current flowing in one or more electrical devices electrically coupled together through a power supply bus, a power output bus, and a common ground. The drive system also includes a voltage sensor configured to generate a first voltage signal representative of a voltage with respect to the common ground in the one or more electrical devices. The drive system further includes a ground fault detection controller configured to determine a ground fault in the one or more electrical devices based on a change in at least one of the first current signal and the first voltage signal.

A drive system includes a current sensor configured to generate a first current signal representative of a current flowing in one or more electrical devices electrically coupled together through a power supply bus, a power output bus, and a common ground. The drive system also includes a voltage sensor configured to generate a first voltage signal representative of a voltage with respect to the common ground in the one or more electrical devices. The drive system further includes a ground fault detection controller configured to determine a ground fault in the one or more electrical devices based on a change in at least one of the first current signal and the first voltage signal.

An overvoltage protection circuit for a first subsystem of a multivoltage vehicle electrical system, in which the first subsystem having a first vehicle electrical system voltage, a second subsystem having a second vehicle electrical system voltage, and an electric machine for supplying the second subsystem. The first system voltage is less than the second system voltage. The overvoltage protection circuit includes a first ground connection for connecting a shared ground potential of the first subsystem, the second subsystem, and the electric machine, an additional second ground connection for connecting a reference ground potential, and a control connection for controlling the electric machine. The overvoltage protection circuit checks whether a ground differential voltage between the first and second ground connections reaches a threshold value, and for reducing the second vehicle electrical system voltage when the ground differential voltage between the first and second ground connections reaches the threshold value.

An overvoltage protection circuit for a first subsystem of a multivoltage vehicle electrical system, in which the first subsystem having a first vehicle electrical system voltage, a second subsystem having a second vehicle electrical system voltage, and an electric machine for supplying the second subsystem. The first system voltage is less than the second system voltage. The overvoltage protection circuit includes a first ground connection for connecting a shared ground potential of the first subsystem, the second subsystem, and the electric machine, an additional second ground connection for connecting a reference ground potential, and a control connection for controlling the electric machine. The overvoltage protection circuit checks whether a ground differential voltage between the first and second ground connections reaches a threshold value, and for reducing the second vehicle electrical system voltage when the ground differential voltage between the first and second ground connections reaches the threshold value.

An electrical network includes feed-in means, loads, and a distribution network located therebetween which includes at least one dynamic isolator and busbars. The feed-in means and the loads together with associated busbars are disposed in groups which can be electrically interconnected or disconnected by the at least one dynamic isolator. The at least one dynamic isolator monitors the voltage on the busbars adjacent thereto for a voltage difference. In a normal state without a voltage difference, the at least one dynamic isolator electrically disconnects the groups from one another, and in the event of a voltage difference between the busbars adjacent thereto, the at least one dynamic isolator electrically connects the groups to one another.

An electrical network includes feed-in means, loads, and a distribution network located therebetween which includes at least one dynamic isolator and busbars. The feed-in means and the loads together with associated busbars are disposed in groups which can be electrically interconnected or disconnected by the at least one dynamic isolator. The at least one dynamic isolator monitors the voltage on the busbars adjacent thereto for a voltage difference. In a normal state without a voltage difference, the at least one dynamic isolator electrically disconnects the groups from one another, and in the event of a voltage difference between the busbars adjacent thereto, the at least one dynamic isolator electrically connects the groups to one another.

A method for detecting a phenomenon in an electrical power network including at least one protection zone with at least two subzones. The method including measuring in the subzones of the protection zone at least one current signal actual in the respective subzone, determining linear dependency between the at least one measured current signal actual in at least one subzone of the protection zone and the corresponding at least one measured current signal actual in at least one another subzone of the protection zone, and detecting the phenomenon in the protection zone of the electrical power network based on the at least one determined linear dependency. Furthermore, a system for detecting a phenomenon in an electrical power network.

A method for detecting a phenomenon in an electrical power network including at least one protection zone with at least two subzones. The method including measuring in the subzones of the protection zone at least one current signal actual in the respective subzone, determining linear dependency between the at least one measured current signal actual in at least one subzone of the protection zone and the corresponding at least one measured current signal actual in at least one another subzone of the protection zone, and detecting the phenomenon in the protection zone of the electrical power network based on the at least one determined linear dependency. Furthermore, a system for detecting a phenomenon in an electrical power network.

A described example includes a circuit. The circuit can include a current sense circuit having a sense input and a sense output, in which the sense input is coupled to an input terminal. A comparator has a first comparator input, a second comparator input, and a comparator output, in which the first comparator input is coupled to the sense output, the second comparator input is coupled to a threshold terminal, and the comparator output is coupled to a fuse terminal. A current programming circuit has a current input and a current output, in which the current input is coupled to the sense output. A first circuit is coupled between the sense output and a ground terminal. A second circuit is coupled between the current output and the ground terminal.