Systems and techniques are disclosed that monitor an area adjacent to power system components and detect objects that may pose a probable risk of causing a fault, for example, making contact with the power system component. Various embodiments initiate a preventative, a corrective, and/or a mitigative action in advance of the fault. Examples of possible actions include, but are not limited to, an audible alert, a visual alert, a tactile alert, a remote notification, a limiting of machinery motion, a stopping of machinery motion, a reversing of machinery motion, de-energization of the power system component, or combinations thereof.

A shutdown control system and a shutdown control method are provided. A main circuit is a series circuit formed by connecting output ends of multiple shutdown circuits in series or a series-parallel circuit formed by connecting output ends of multiple such series circuits in parallel. Each of the multiple shutdown circuits is connected to at least one of direct current power supplies in a distributed power generation system. A control circuit includes a SCU, one or more ACUs, and multiple PCUs corresponding to the multiple shutdown circuits. The SCU and the ACU are configured to transmit respective mode control instructions when respective condition is satisfied. Each of the multiple PCUs is configured to obtain multiple criteria based on the mode control instructions, determine a target operation mode of a corresponding shutdown circuit, and control the shutdown circuit to operate in the target operation mode.

An electrical installation includes: a switchgear cabinet; a protective switch arranged in the switchgear cabinet; at least one optical triggering device which is operatively connected to the protective switch and for triggering or switching off the protective switch upon optical detection of an arc; a detection device for detecting an access or an access request to a secured area of the electrical installation by detecting a presence of the at least one optical triggering device in a danger area of the electrical installation; and an electronic circuit which is connected to the detection device and allows, and otherwise prevents, a triggering or switching off of the protective switch by the at least one optical triggering device upon detection of the access or the access request, when the at least one optical triggering device is present in the danger area.

A circuit for minimizing energy provided to a ground fault includes a source, a multiple switches, an output filter, and a controller. The switches include a first side pair of switches and a second side pair of switches configured to provide an output signal based on the source. The output filter includes one or more energy storage elements coupled to the first side pair of switches or the second side pair of switches. The controller is configured to receive a ground fault signal that indicates a fault has occurred and configured to generate a switch signal for the switches for a minimum energy state of the output filter and in response to the ground fault signal.

A system is provided that includes a power transmitter configured to provide power to a current loop, a power receiver configured to receive the power from the current loop. The power receiver is configured to, on a periodic basis, disconnect from the current loop to stop pulling power from the current loop for a period of time to enable a safety check to be performed by the power transmitter. The power transmitter is configured to: monitor current on the current loop; determine whether a current level on the current loop passes the safety check within a predetermined time interval since a determination that the current level was not within a safe range; and control connectivity of the power to the current loop depending on whether the safety check has or has not passed within the predetermined time interval.

An improved long range coil and driver assembly for a magnetic field generator wherein the driver and coil generate a large magnetic field is provided. The coil and driver assembly includes a source impedance control network which includes a plurality of pairs of resistors and amorphous noise suppression devices, and a coil that utilizes a unique basket weave winding pattern to reduce the effect of the back EMF from one wire on the adjoining wires, thereby reducing the impedance of the coil. The reduced impedance and improved impedance control increases the current that can flow creating a larger field.

Aspects of the present disclosure are directed to increasing protection against electric shocks when a person is working on an electrical system. In some embodiments, the electrical system includes at least two different circuits and a safety module. An emergency signal input is provided on the safety module, and when an external emergency signal is received via the emergency signal input, the safety module shuts off a configured first circuit the associated switch and at least one further circuit via the associated switch if the safety module still receives the emergency signal at the emergency signal input after a predetermined period of time.

Aspects of the present disclosure are directed to increasing protection against electric shocks when a person is working on an electrical system. In some embodiments, the electrical system includes at least two different circuits and a safety module. An emergency signal input is provided on the safety module, and when an external emergency signal is received via the emergency signal input, the safety module shuts off a configured first circuit the associated switch and at least one further circuit via the associated switch if the safety module still receives the emergency signal at the emergency signal input after a predetermined period of time.

A vehicle power supply device converts power from high voltage to low voltage by selectively connecting a predetermined power storage element group to a low voltage electric load from a high voltage power supply formed by connecting power storage elements in series. A leakage current from the high voltage power supply is measured during the dead time period when the power storage element group is not connected to the low voltage electric load. When the value exceeds a predetermined value, the connection between the power storage element group and the low-voltage electric load is interrupted, so that electric shock is prevented.

An object is to provide a DC power supply connector that can suppress occurrence of an arc discharge at DC power off with a small-scale configuration without reducing power efficiency during DC power supply and can reduce heat generation. The connector includes, on at least any of a positive-electrode-side electrode side and a negative-electrode-side electrode side, a movable contact piece (20c) that touches a first contact (25) in a state where a terminal (11) on a power receiving side has been inserted and to touch a second contact (24) in a state where the terminal has not been inserted, and a current limiting circuit (30) including a switching element (T1). The current limiting circuit (30) does not flow a current to the switching element (T1) in the case where the movable contact piece (20c) is touching the first contact (25), and flows a current to the terminal (11) through the movable contact piece (20c) until the movable contact piece (20c) is linked to the second contact (24) after separation from the first contact (25), and gradually decreases the flowing current.