The present disclosure provides a DC mechanical circuit breaker that can utilize two switches, one of which can generate zero-crossing with an alternate oscillatory circuit for the other one, which can be a conventional zero-crossing-based AC breaker and can be used in the main circuit. This is different from the conventional single-switch commute-and-absorb method currently used. The present disclosure shows that disclosed circuit breaker improves the fault current extinction and significantly reduces the voltage rate-of-change while creating the current zero-crossing faster compared to the available technology. Thus, disclosed circuit breaker is capable of interrupting high DC currents with minimal arc through a less expensive AC circuit breaker. Simulation and hardware results are provided to show the efficiency of the disclosed circuit breaker.

In order to test substations from different manufacturers and of different types in a simple manner, it is provided that a control unit (6) for a switching device (5) of a substation (4) is connected via an adapter cable (11) to a test device (10), which simulates the switching device (5) for the test and the test device (10) reads configuration-specific data from a memory unit (15) on the adapter cable (11) and the test unit (10) thus configures its signal inputs (BE) and signal outputs (BA, AA) that are required for conducting the test.

A testing apparatus for imposing a traveling wave signal on an electric system signal for testing a fault detector is disclosed herein. The fault detector may be configured to simulate a fault at a particular location by controlling the timing of the traveling wave signal. The testing apparatus may be configured to impose multiple traveling wave signals to test the accuracy of the fault location determined by the fault detector. The testing apparatus may be configured to determine the calculation accuracy of the fault detector. The testing apparatus may impose a traveling wave signal on a signal simulating an electrical signal on an electric power delivery system. The testing apparatus may be used to test capabilities of a fault detector of detecting a fault using traveling waves or incremental quantities.

A remote blade closing detector switch is positioned on or near the jaws of an electric power disconnect switch, where proper seating of the blade in the jaws activates a detector switch. An extended conductor lead electrically connects the detector switch an RFID tag placed in a convenient reading location. The detector switch is configured to control a data signal, power to the antenna of the RFID tag, the power supply to the RFID tag, or a data signal between an RFID chip and an antenna as mechanisms for enabling and disabling the tag to report a status indicator. An antenna tuning compensator may be utilized to compensate for the impedance of the long conductor lead connected to the antenna. A noise filter may also be used to suppress electrical noise picked up by the long conductor lead in the harsh electrical environment of the disconnect switch.

A power distribution system is disclosed and may include an input power source and at least one circuit breaker associated with each branch circuit receiving power from the input power source. The power distribution system may also include a monitoring subsystem configured to detect when a line side voltage of the at least one circuit breaker is above an undervoltage fault value and when the current through the at least one circuit breaker is above a minimum value for at least one line cycle, and notifying of a breaker trip condition when the current through the at least one circuit breaker falls below the minimum value and then below a zero current level or a circuit breaker magnetizing current level within a threshold number of line cycles and the line side voltage of the at least one circuit breaker remains above the undervoltage fault value.

A power supply processing device includes three electric control valve groups, a positive output terminal and a conversion control switch group. The conversion control switch group includes a selection switch group configured to selectively connect the current valve control components in each electric control valve group to the positive output terminal or the phase output terminal, and a connection switch group configured to connect or disconnect a current path between two electric control valve groups connected one another. In such a way, both AC experiments and DC experiments of high voltage and large capacity may be performed to the connectors without changing experimental site and experimental equipment, thereby effectively reducing the experimental cost.

A ground and test (G&T) device includes a test device housing having upper terminals and lower terminals carried by the test device housing and engaging the load and line conductors when the test device housing in installed within the compartment of the switchgear frame. A plurality of grounding bars include a first set of grounding bars that connect the upper terminals to a lower ground bar and a second set of grounding bars that connect the lower terminals to the lower ground bus bar when the first set of grounding bars are not connected. A ground shoe assembly is connected to the lower ground bus bar and configured to engage a grounding circuit carried by the switchgear frame and includes a ground shoe bracket, bus bars, and die springs.

A synthetic test circuit for testing a submodule performance in a power compensator includes a submodule test unit which is an object of testing the submodule performance, a current source and a controller. The current source is connected to the submodule test unit to supply a voltage to the submodule test unit such that a charging voltage having a capacity set in the submodule test unit is stored in order to operate the submodule test unit. The controller is configured to perform control to perform a submodule performance test of the submodule test unit using the stored charging voltage.

A system and method are provided for a floating reference recloser voltage sensor that measures low energy analog voltage from a voltage divider connected to a high energy transmission line electrode. A floating reference cylindrical voltage screen is coaxially positioned between a high energy transmission line electrode and a cylindrical ground plate, and is positioned closer to the transmission line electrode. The floating reference recloser voltage sensor is filled with a solid dielectric material. A voltage divider network is formed when a voltmeter of a recloser controller is connected to the high-voltage electrode and the floating reference voltage screen, and connected in parallel with another divider network capacitance. The voltmeter reads a low energy voltage drop between the high energy transmission line electrode and the floating reference voltage screen. The recloser controller and the voltmeter are both disconnected from ground.

A failure prediction assembly is structured to monitor circuit breaker assembly sub-assemblies and their component's characteristics. The failure prediction assembly includes a sensor supported D-shaft and a sensor assembly including a housing and a number of sensors. The sensor assembly housing defines a D-shaft passage. A control unit is in electronic communication with the sensor assembly. The sensor assembly housing is coupled to the circuit breaker sidewalls with the sensor assembly housing D-shaft passage aligned with the circuit breaker sidewall D-shaft passages. The sensor supported D-shaft is rotatably coupled to the sensor assembly with the sensor supported D-shaft disposed through said sensor assembly housing D-shaft passage.