A hybrid switch assembly for a circuit breaker assembly is provided. The circuit breaker assembly includes a housing assembly and an operating mechanism. The housing assembly defines a power electronic switch assembly cavity. A hybrid switch assembly includes a number of conductor assemblies, each conductor assembly including a movable conductor, and a stationary conductor. Further, each movable conductor is structured to move between an open, first position, wherein each movable conductor is spaced from and not in electrical communication with an associated stationary conductor, and a closed, second position, wherein each movable conductor is coupled to and in electrical communication with an associated stationary conductor. A number of the conductor assemblies further include a power electronic switch assembly. Each power electronic switch assembly includes an isolation contact assembly. Each isolation contact assembly is selectively coupled to, and in electronic communication with, the stationary conductor and the movable conductor.

In one embodiment, a solid state circuit breaker is to couple between a distribution grid network and a power conversion system. The solid state circuit breaker includes at least one switch circuit and a controller. The at least one switch circuit may include modules, each having: at least one bidirectional switch formed of bare die power transistors; a surge protection device coupled in parallel with the at least one bidirectional switch; a bypass switch coupled in parallel with the at least one bidirectional switch; and a voltage detector coupled to the at least one bidirectional switch to detect a voltage across the at least one bidirectional switch and output a first feedback signal. The controller is configured to receive the first feedback signal from the modules and control the bypass switch of at least one of the modules based at least in part on the first feedback signal.

A hybrid circuit breaker and a pre-charge control method are provided. The hybrid circuit breaker includes an outer branch, a first branch, a first mechanical switch module, a second branch, an electronic switch and a current commutation circuit. The first branch is connected with the outer branch in series. The first mechanical switch module is located on the first branch. The second branch is connected with the first branch in parallel. The electronic switch is located on the second branch. The current commutation circuit includes a voltage source module and an inductor. The voltage source module is located on the second branch. The inductor is located on one of the first branch or the second branch.

A system for operating an on-load tap changer (OLTC) includes a plurality of legs that include mechanical switches. At least one leg switches from a first to a second tap of the OLTC on receipt of a tap change signal. At least one mechanical switch is activated to establish an electrical connection between one of the first and the second tap and a power terminal of the OLTC. Further, the system includes semiconductor switches that are parallel to the mechanical switches and when activated electrically couple one of the first and the second tap and the power terminal. The system includes a processing unit that selectively activates and deactivates the mechanical and semiconductor switches in such a way that electrical contact is maintained between at least one of the taps and the power terminal during the transition of at least one leg from the first tap to the second tap.

A hybrid switch assembly for switching AC current in a circuit interrupter includes a power electronics (PE) branch connected in parallel with a mechanical branch. The PE branch includes two series connected modules, PE+ and PE. The mechanical branch includes two series connected pairs of separable contacts, MEC+ and MEC. The PE+ module and MEC+ contacts interrupt current during a positive voltage half-cycle, and the PE module and MEC interrupt current during a negative voltage half-cycle. Including two sets of separable contacts requires only the PE module oriented in the direction of the current at the time of interruption to be powered on and enables the other PE module to remain powered off, so that excess resistive heat losses and impedance-based losses that would otherwise be incurred by powering on both PE modules are avoided.

Disclosed are an arc extinguishing control system and method for a relay of an emergency power supply. A relay serves as a main switching circuit for controlling an emergency power supply, and electronic switching tubes are connected in parallel to two ends of the relay, so as to withstand a voltage jump when the relay is disconnected, and common problems of existing relays, such as arc damage and an internal resistance increase, are solved. When a heavy reverse charging current occurs after the vehicle is started, a reverse charging sensing circuit and a reverse charging feedback circuit are used, so that a reverse charging current is directly fed back to a control end of an electronic switching tube when a storage battery is reversely charged by a load, thereby realizing quick disconnection of the electronic switching tube.

The present disclosure relates to a switching apparatus for DC electric grids. The switching apparatus comprises first and second electric terminals for electrical connection with corresponding conductors of an electric line. The switching apparatus further comprises a primary switching arrangement including primary switching devices configured to conduct or block a current along a conductive path between the first and second electric terminals. The switching apparatus additionally comprises a control stage configured to control one or more components of the switching apparatus and a power supply stage electrically connected to the control stage to feed the control stage with electric power. The switching apparatus also comprises a secondary switching arrangement including secondary switching devices controllable by the control stage. The secondary switching devices are configured to electrically connect the power supply stage with said first electric terminals or with said second electric terminals.

A control circuit of a hybrid switch comprising a main current path, which has a disconnecting element, and an auxiliary current path, which is connected in parallel with the main current path and has a semiconductor switch. The control circuit has a first terminal for the disconnecting element and a second terminal for the semiconductor switch and is configured to carry out a method in which a request for interrupting a current flow via the hybrid switch is recognized. A temporal sequence of an electrical voltage applied to each of the two terminals is chosen depending on the disconnecting element connected to the first terminal and the semiconductor switch connected to the second terminal. Furthermore, a hybrid switch is also provided.

For a low-voltage protective device, comprising: at least a first outer conductor path with a bypass switch, a first semiconductor circuit arrangement connected in parallel to the mechanical bypass switch, the first semiconductor circuit arrangement comprising at least one power semiconductor, at least a first voltage-dependent resistor is arranged in parallel with the bypass switch and the first semiconductor circuit arrangement, a control and driver unit configured to drive the first semiconductor circuit arrangement with a control voltage, it is suggested, that the low-voltage protective device comprises a voltage-detection-arrangement for detecting a voltage drop at the first voltage-dependent resistor and/or at least one temperature-detection-device to measure the temperature of the first voltage-dependent resistor at least before a switch on of the low-voltage protective device.

A hybrid circuit breaker includes: input connectors configured to receive electrical energy from a power grid; output connectors configured to transfer electrical energy to a load; current paths, each connecting a respective input connector, of the input connectors, and a respective output connector, of the output connectors; an electro-mechanical bypass switch in at least one of the current paths; a semiconductor circuit in parallel with the electro-mechanical bypass switch; a controller configured to control a commutation from the current path in which the electro-mechanical bypass switch is arranged to the semiconductor circuit in a switching operation; and an active cooling device in a vicinity of the electro-mechanical bypass switch. The active cooling device is adopted to cool movable parts of the electro-mechanical bypass switch.