A sliding power contact and method includes a mobile load device connector and a socket. The mobile load device connector includes a non-current power pin having a first length, a current power pin having a second length less than the first length, a neutral pin, and a ground pin. The socket includes a non-current power contact configured to electrically couple with the non-current power pin, a current power contact configured to electrically couple with the current power pin, a neutral contact configured to electrically couple with the neutral pin, and a ground pin configured to electrically couple with the ground pin. An arc suppressor is directly coupled to at least one of the non-current power pin and the non-current power contact, wherein the arc suppressor, the non-current power pin and the non-current power contact form a current path between the current power pin and the current power contact.

A testing system includes a truck carrying a circuit breaker, a fixed contact, and an actuator piston connected to a movable contact. A test platform supports the truck in a contact testing position and includes a sensor circuit mounted on the test platform and positioned under the truck and aligned with the circuit breaker when the truck is on the test platform in the contact testing position. The sensor circuit is configured to acquire displacement data of the actuator piston when the movable electrical contact is moved between the open and closed positions. A controller is coupled to the sensor circuit and configured to receive the displacement data and determine electrical contact erosion within the circuit breaker.

In a method for adapting an arc sensor (35) to a position in an electrical installation system, according to the invention a specifiable number of specifiable arcs are simulated and/or produced at least at a first position in the installation system, wherein after each simulated or produced arc, at least one current curve and/or voltage curve is recorded in a measured-value recording unit (2), wherein at least one characteristic of the recorded current curves and/or voltage curves is determined and stored, and the arc sensor (35) is trained for the electrical installation system.

A synthetic test circuit, comprising: a device under test including a chain-link converter under test, comprising a plurality of test modules, each test module including module switches connected with an energy storage device; a terminal connected to the device under test; at least one injection circuit operably connected to the terminal, the injection circuit including a source, the source including a source chain-link converter, which includes a plurality of source modules, each source module including a plurality of module switches connected with at least one energy storage device; a controller being configured to operate each source module to selectively bypass the corresponding energy storage device and insert the corresponding energy storage device into the corresponding source chain-link converter so as to generate a voltage across the source chain-link converter and thereby operate the injection circuit to inject a current waveform and/or a voltage waveform into the chain-link converter under test.

An interface test device for testing a circuit, the interface test device including a module assembly including a plurality of modules, wherein a test block assembly is formed from individual test blocks that are arranged at one another in parallel and fixated at one another, wherein a test plug assembly is formed from individual test plugs that are arranged at one another other in parallel and fixated at one another, wherein a movement of a lever arm out of a plane of an insertion direction of the test plug assembly into the test block assembly is transferred by strut elements to pinions of the test plug assembly and inserts test fingers of the test plug assembly into openings of the test block assembly, wherein one of the test fingers of the test plug assembly opens a medium to high voltage monitoring circuit.

A testing device is provided. The testing device comprises a processor and a switching AC to AC power converter that has no DC link. The processor is configured to set a plurality of bi-directional switches in the power converter in a configuration of on/off states that cause a substantially set electric current to flow through a component being tested by the testing device.

A diagnostic apparatus diagnoses a symptom of anomaly in a device that operates for making or breaking a circuit. The diagnostic apparatus includes a factor probability calculation unit that calculates a factor probability. The factor probability calculation unit calculates a factor probability for each matter that may be a factor in a symptom observed in the device, the factor probability being a probability that the matter truly corresponds to a factor for the observed symptom. The diagnostic apparatus can obtain useful information for improving the operating state of the device.

A testing method has corresponding a contacts group to a key of a computer keyboard; corresponding a contacts group state to a key state; corresponding a first keys group and a second keys group to a first power contacts group and a second power contacts group respectively; obtaining and storing a first values group and a second values group when the first keys group and the second keys group are closed respectively; respectively calculating difference values between one value in the first or second values group and other values thereof; dividing the difference values by the device frequency value to obtain a first or second difference values group; and storing the difference values groups. The first and second difference values groups accurately reflect conduct synchronism of each pole of dual power transfer switch.

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.

A ground and test (G&T) device includes a test device housing having load and line conductors and a plurality of upper terminals and plurality of lower terminals carried by the test device housing and configured to engage the load and line conductors when the test device housing in installed within the compartment of the switchgear frame. A lower ground bus bar is carried by the test device housing and a plurality of grounding bars selectively connect either the upper terminals to the lower ground bus bar or connect the lower terminals to the lower ground bus bar. A ground shoe assembly is connected to the lower ground bus bar and configured to engage a grounding circuit carried by the switchgear frame.