Abstract:
An arc fault circuit interrupter (2) includes separable contacts (4), a neutral conductor (27), an operating mechanism (6) structured to open and close the separable contacts, at least one current sensor (8,50,52) structured to sense current flowing through the separable contacts and output a sensed current value; and a processor (14). The processor (14) includes a first routine (34) structured to provide parallel arc fault detection, a second routine (200) structured to provide series arc fault detection, and a third routine (400) structured to enable (404) the first routine and disable the second routine for a predetermined time when the sensed current value is greater than a predetermined value and to enable (405) the second routine and disable the first routine for the predetermined time when the sensed current value is less than the predetermined value.
Abstract:
An electrical distribution system includes a switchgear or motor control center cabinet, a plurality of first protective, metering or control devices internal to the cabinet, and one or more second devices. The second devices include display devices mounted on the cabinet, display devices external to the cabinet and monitoring devices structured to monitor the system and communicate to a remote location. Communications among the first devices and the second devices are wireless communications.
Abstract:
A system displays information from and controls electrical switching apparatus, such as circuit breakers. The system includes a plurality of circuit breakers having separable contacts and a plurality of conditions, such as bus temperature and contact wear. A plurality of sensors are structured to sense the conditions of the circuit breakers and to communicate the sensed conditions over corresponding wireless signals. A display and control unit is operatively associated with the circuit breakers and is structured to receive the corresponding wireless signals and display information corresponding to the sensed conditions or to control the circuit breakers based upon one or more of the sensed conditions.
Abstract:
A system displays information from and controls electrical switching apparatus, such as circuit breakers. The system includes a plurality of circuit breakers having separable contacts and a plurality of conditions, such as bus temperature and contact wear. A plurality of sensors are structured to sense the conditions of the circuit breakers and to communicate the sensed conditions over corresponding wireless signals. A display and control unit is operatively associated with the circuit breakers and is structured to receive the corresponding wireless signals and display information corresponding to the sensed conditions or to control the circuit breakers based upon one or more of the sensed conditions.
Abstract:
A releasable net system using a releasable net attachment mechanism is provided. The releasable net system includes two or more upright structures with lateral support structures extending therebetween, and at least one net configured with the lateral support structures to form a net wall. The at least one net is attached to the lateral support structures using one or more releasable attachment mechanisms that are adapted to break under a predetermined load. In this way, the releasable attachment mechanisms may release the net from the support structures under environmental load conditions (high winds, snow, freezing rain) prior to the collapse of the support structures. The system may be used with outdoor netting systems such as those used for errant ball containment at golf driving ranges.
Abstract:
An electrical distribution system includes a switchgear or motor control center cabinet, a plurality of first protective, metering or control devices internal to the cabinet, and one or more second devices. The second devices include display devices mounted on the cabinet, display devices external to the cabinet and monitoring devices structured to monitor the system and communicate to a remote location. Communications among the first devices and the second devices are wireless communications.
Abstract:
A sensor apparatus (2) for a power bus (4) including a current and a temperature includes a housing (6) and one or more sensors (44, 114, 118). Each of the sensors is adapted to sense one of the current or the temperature of the power bus. A radio transceiver circuit (50, 110) is adapted to transmit a first wireless signal (130) and to receive a second wireless signal. A processor (88, 122) is adapted to input the sensed current and the sensed temperature from the sensors and to output corresponding signals to the radio transceiver circuit in order to transmit the first wireless signal. A power supply (24) is adapted to employ voltage produced by magnetically coupling the power bus to one or more coils, in order to power the sensors, the radio transceiver circuit and the processor from flux arising from current flowing in the power bus.