摘要:
Disclosed is an electrical receptacle which is safe for children yet easy for adults to use. This electrical receptacle provides power only to a properly inserted plug and makes use of one or more sensors which are able to detect blade insertion, ground plug insertion, presence of the plug face motion near the receptacle face or a combination thereof The receptacle includes a contact assembly adapted and configured to conductively couple each blade of the plug to a conductor, one or more sensors, and a control circuit; wherein the control circuit determines whether or not to provide power to the properly inserted plug by determining if substantially simultaneous insertion has occurred.
摘要:
A clocked power supply is proposed which contains a fault current detection means (32) which evaluates a voltage drop occurring at an ohmic measuring resistor (25), and emits a switch-off signal (40) to a clocked voltage converter (5). The ohmic measuring resistor (25) is arranged in a line (24) of the clocked voltage converter (5) in which the alternating operating current of the clocked voltage converter (5) flows, the frequency of which alternating operating current is equal to the frequency of a switching signal (23) with which a circuit breaker (16) is operated. In order to suppress the portion of the voltage drop which can be tapped at the ohmic measuring resistor (25) and whose frequency corresponds to that of the switching signal (23), means, for example a low pass filter (33) and/or a parallel capacitor (26) which bridges the ohmic measuring resistor (25) are provided. The clocked power supply according to the invention is particularly suitable for operating gas discharge lamps (7) which are installed for example in motor vehicles, an effective protection of persons (30) against inadvertent contact with live components being provided.
摘要:
An electrical safety apparatus arranged to be connected between an electrical power source and a load to provide protection against electric shock due to, for example, the insertion of probes or needles into a potentially live socket by a child, and against shock form exposed conductors (e.g. the severed cable of an electrical appliance) connected to the power source. When the apparatus is connected to an electrical power source and then connected to a load, the apparatus first applies a low test voltage or test current to determine that the impedance of the load is within a safe range which excludes that of the human body, before connecting the load to the normal electrical power supply or mains. After the apparatus has been connected to a load of suitable impedance the apparatus monitors the power drawn by the load so that should the impedance of the load change to an unsafe value during operation of an electrical appliance (e.g. due to the power lead to the appliance being severed) the apparatus operates to disconnect the load from the electrical power source.
摘要:
Apparatus for discharging residual high voltage charge associated with electrostatic paint spraying equipment, including a safety enclosure for confining equipment which becomes highly voltage-charged and which discharges such voltage when entry is made into the safety enclosure.
摘要:
This electric field proximity detector enables a worker to detect the presence of a dangerous power line or other electrical source and to then maintain a safe separation from it. A power line need not carry any current as a condition for detection since the device operates on the electric field about the conductor. Response to spurious radiation is eliminated, a sensitivity control is provided to permit setting the device to respond to various fixed combinations of field strength and distance from power lines, a threshold circuit will mark the boundary of safe operation within very narrow limits once the device is adjusted for a particular set of conditions; and a self-testing feature permits the operator to determine the working condition of the device. This miniaturized device contains its own power supply and loudspeaker, making for easy installation on cranes, aerial personnel baskets, and other types of lifting and construction equipment which may be used near power lines. The alarm circuit may also be used to activate other electrical circuits causing machinery to shut down when the alarm is activated. This device may also be used as a test instrument to detect energized lines and sources.
摘要:
A power supply control device comprises a controller and power connection circuitry. The power connection circuitry comprises a switchable power connection path between a source side and a load side. The power connection path is switchable to operate in a first operation state or an on-state in which state impedance between the source side and the load side is very low to permit flow of operation current through the power connection path, or a second operation state or an off-state in which state impedance between the source side and the load side is very high to impede flow of operation current through the power connection path. The controller is to operate to transmit at least one type of enquiry signals to the load side and to determine with reference to at least one type of received responsive signals whether a load on the load side is eligible for power supply connection. The controller is to switch the power connection path to the on-state or to maintain the power connection path to the on-state if the responsive signals indicate eligibility for power supply connection.
摘要:
The personal electrical injury protection device includes a first wireless transmitter, a first receiver, and a second receiver. The first wireless transmitter is adapted to be worn on an end user. The first wireless transmitter is in wired connection with at least one electrical sensor. The at least one electrical sensor is adapted to be attached to a limb of said end user, and is able to detect a change in voltage, and upon doing so shall signal the first receiver. The first receiver is in wireless communication with the first transmitter, and includes a speaker, and at least one light. The second receiver is adapted to turn off the main circuit breaker in order to stop electricity to be transmitted to all applicable circuits, and of which an end user has come into contact.
摘要:
A power line proximity sensing and warning system. The embodiments disclosed herein may be configured as standalone systems or may be used in conjunction with each other or with other conventional systems.
摘要:
The present invention relates to a method (100) and a device for discharging an intermediate circuit (9) of a power supply network (10), in particular a high-voltage network, wherein a consumer (7) can be connected to the power supply network (10). A first (11) and a second (12) discharge circuit for discharging the intermediate circuit (9) are provided. In a first step, the intermediate circuit (9) is discharged at least partially by means of the first discharge circuit (11) and, in a subsequent second step (104), the intermediate circuit (9) is further discharged (104) by means of the second discharge circuit (12).