An arc suppressing circuit configured to suppress arcing across a power contactor coupled to an alternating current (AC) power source having a predetermined number of phases, each contact of the power contactor corresponding to one of the predetermined number of phases includes a number of dual unidirectional arc suppressors equal to the predetermined number of phases of the AC power source. Each dual unidirectional arc suppressor includes a first phase-specific arc suppressor configured to suppress arcing across the associated contacts in a positive domain, a a second phase-specific arc suppressor configured to suppress arcing across the associated contacts in a negative domain, and a coil lock controller, configured to be coupled between a contact coil driver of the power contactor, configured to detect an output condition from the contact coil driver and inhibit operation of the first and second phase-specific arc suppressors over a predetermined time.

A testing device for testing a control unit of a switching device of an electrical switchgear installation. The testing device has a signal input, and to which a controlled current sink is provided, which is connected to the signal input. The controlled current sink shunts an input current from the signal input in order to provide a dynamically adjustable input impedance. A method for testing a control unit of a switching device of a switchgear installation, includes the testing device having a signal input, to which an input voltage may be applied. In the testing device, a controlled current sink shuts an input current from the signal input and thus provides a dynamically adjustable input impedance.

A high speed arc suppressor and method include a first phase-specific arc suppressor configured to suppress arcing across contacts of the power contactor in a positive domain and a second phase-specific arc suppressor configured to suppress arcing across the contacts in a negative domain. First and second high speed switches are configured to enable and disable operation of an associated one of the first and second phase-specific arc suppressors. First and second drivers are configured to drive the first and second high speed switches.

A high speed arc suppressor and method include a first phase-specific arc suppressor configured to suppress arcing across contacts of the power contactor in a positive domain and a second phase-specific arc suppressor configured to suppress arcing across the contacts in a negative domain. First and second high speed switches are configured to enable and disable operation of an associated one of the first and second phase-specific arc suppressors. First and second drivers are configured to drive the first and second high speed switches.

An arc suppressing circuit configured to suppress arcing across a power contactor coupled to an alternating current (AC) power source having a predetermined number of phases, each contact of the power contactor corresponding to one of the predetermined number of phases includes a number of dual unidirectional arc suppressors equal to the predetermined number of phases of the AC power source. Each dual unidirectional arc suppressor includes a first phase-specific arc suppressor configured to suppress arcing across the associated contacts in a positive domain, a a second phase-specific arc suppressor configured to suppress arcing across the associated contacts in a negative domain, and a coil lock controller, configured to be coupled between a contact coil driver of the power contactor, configured to detect an output condition from the contact coil driver and inhibit operation of the first and second phase-specific arc suppressors over a predetermined time.

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.

Systems and methods for measuring low energy voltage in a high energy transmission line electrode divider network. A floating reference voltage screen is positioned between a high energy transmission line electrode and a ground plate at a distance from the high energy transmission line electrode that is shorter than a distance between the ground plate and the floating reference voltage screen. A first conductive lead electrically couples the high energy analog transmission line electrode to a first input of a voltmeter that is connected to a controller. A second conductive lead electrically couples the floating reference voltage screen to a second input of the voltmeter. An alternating voltage drop is measured across the high energy transmission line electrode and the floating reference voltage screen by electronics of the voltmeter connected to the controller. The controller and the voltmeter are both disconnected from the ground plate.

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 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.

Ground and test devices (G&TD) have an interchangeable test configuration using serially releasably mountable first and second ground assemblies and releasably mounted primary arm conductors thereby allowing for onsite field modification of a base test unit for use to test either the load side or line side terminals without requiring two separate base test devices providing an economic and less bulky test solution for end users.