A circuit interrupter including a line conductor, a neutral conductor, a printed-circuit board coil, and a test circuit. The printed-circuit board coil has an aperture configured to receive the line conductor. The test circuit is electrically connected to the printed-circuit board coil. The test circuit is configured to determine an arc fault condition based on a signal of the printed-circuit board coil.

A system including an arc flash sensor that detects an arc flash event and an arc flash mitigation device in communication with the sensor. The mitigation device includes a path of least resistance having a path input and a path output. The arc flash sensor is located downstream the output. The mitigation device includes an electro-mechanical switch between the input and the output and an actuator. The mitigation device also includes a bypass power switch device that includes a solid-state circuit interrupter and that conduct current between the input and the output in response to an open-circuit condition of the switch. A system controller is provided to generate a trigger to activate the actuator to generate the open-circuit condition of the switch, which causes the power switch device to interrupt a fault current associated with a fault event in response to detection of the arc flash event.

A system including an arc flash sensor that detects an arc flash event and an arc flash mitigation device in communication with the sensor. The mitigation device includes a path of least resistance having a path input and a path output. The arc flash sensor is located downstream the output. The mitigation device includes an electro-mechanical switch between the input and the output and an actuator. The mitigation device also includes a bypass power switch device that includes a solid-state circuit interrupter and that conduct current between the input and the output in response to an open-circuit condition of the switch. A system controller is provided to generate a trigger to activate the actuator to generate the open-circuit condition of the switch, which causes the power switch device to interrupt a fault current associated with a fault event in response to detection of the arc flash event.

A circuit interrupter including a line conductor, a printed-circuit board, and a test circuit. The printed-circuit board coil is embedded on a printed circuit board. The printed circuit board includes a slot through the printed-circuit board coil, wherein the line conductor is received by the printed-circuit board coil. The test circuit is electrically connected to the printed-circuit board coil. The test circuit is configured to determine a condition of the line conductor based on a signal of the printed-circuit board coil.

A circuit interrupter including a line conductor, a printed-circuit board, and a test circuit. The printed-circuit board coil is embedded on a printed circuit board. The printed circuit board includes a slot through the printed-circuit board coil, wherein the line conductor is received by the printed-circuit board coil. The test circuit is electrically connected to the printed-circuit board coil. The test circuit is configured to determine a condition of the line conductor based on a signal of the printed-circuit board coil.

Method and system allowing more accurate detection and identification of unwanted arcing include novel processing of signal voltage representing recovered power-line current. In one implementation, arc-faults are detected based on numerical analysis where individual cycles of line voltage and current are observed and data collected during each cycle is processed to estimate likelihood of presence of arc-event within each individual cycle based on pre-defined number of arc-events occurring within pre-defined number of contiguous cycles. In another implementation, fast transient current spikes detection can be done by: computing difference values between consecutive line-current samples collected over a cycle, average of differences, and peak-to-peak value of line-current; comparing each difference value to average of difference; comparing each difference value to peak-to-peak value; and, based on calculation of composite of two comparisons, using thresholds to determine if arcing is present within processed cycle.

A method for identifying one or more simultaneously occurring partial discharge sources from partial discharge measurement signals of an electrical device to which an AC voltage is applied includes determining area parameters of at least one enclosed area of partial discharge pulse matrix arrays. For each enclosed area of partial discharge pulse matrix arrays, area parameters of the enclosed area of partial discharge pulse matrix arrays are compared to predetermined rule sets. Predetermined fault rules are applied which allocate characteristic partial discharge pulse area basic forms and characteristic combinations of partial discharge pulse area basic forms to known partial discharge sources, to the ascertained partial discharge pulse area basic forms in order to determine those partial discharge sources which have rendered the corresponding partial discharge pulses.

A gas-insulated switching apparatus of a three-phase-isolated type includes: two first main buses and extending in parallel at an identical height; a first connection bus interconnecting the first main buses; a first divergence bus diverging downward from the first connection bus; and a first circuit breaker connected to the first divergence bus, wherein a connection portion between the first connection bus and the first divergence bus is disposed at a position lower than the height at which the first main buses extend, and a grounding switch is disposed above the connection portion between the first connection bus and the first divergence bus.

A gas-insulated switching apparatus of a three-phase-isolated type includes: two first main buses and extending in parallel at an identical height; a first connection bus interconnecting the first main buses; a first divergence bus diverging downward from the first connection bus; and a first circuit breaker connected to the first divergence bus, wherein a connection portion between the first connection bus and the first divergence bus is disposed at a position lower than the height at which the first main buses extend, and a grounding switch is disposed above the connection portion between the first connection bus and the first divergence bus.

An arc eliminator includes a housing having a space formed therein and including an opening, an arc extinguishing part installed in the housing and including a moving rod disposed to be movable to the space, an indicator rotatably installed within the housing and seen through the opening, and an indicator rotating mechanism interworking with the moving rod when the moving rod moves, to rotate the indicator. A closing state and opening state of an arc extinguishing part may be easily recognized through an indicator and an arc accident may be minimized.