By a News Reporter-Staff News Editor at Journal of Engineering -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Fischer, Andreas (Amberg, DE); Widmann, Stefan (Freudenberg, DE), filed on February 3, 2015, was published online on August 8, 2017.
The assignee for this patent, patent number 9726727, is SIEMENS AKTIENGESELLSCHAFT (Munich, DE).
Reporters obtained the following quote from the background information supplied by the inventors: "Switches in the low-voltage range comprising electromechanical releases are known, for example, as power circuit breakers. The power circuit breakers interrupt the current flowing, for example, when a preset current value, which is detected by an electronic trip unit, is exceeded. The release furthermore comprises a latching magnet (Maglatch), which has a permanent magnet, a winding and a ferromagnetic plunger, wherein the plunger is attracted, counter to the force of a spring, by the magnetic field of the permanent magnet. The tripping takes place by virtue of an opposing magnetic field being generated by the winding arranged on the permanent magnet, which opposing magnetic field compensates for the magnetic field of the permanent magnet in the region of the plunger, such that the plunger is shifted by the spring in the direction of its longitudinal axis in order to actuate the switch. The plunger in this case interacts with an actuator in the form of a switching mechanism, in which a switching shaft is held under mechanical prestress, which switching shaft unlatches the plunger. The switching shaft rotating about its longitudinal axis separates the contact elements and thus opens the switch.
"The winding of the latching magnet forms, with an electrical energy store in the form of a capacitor, a circuit which is closed (and opened again) when the tripping condition of the trip unit is met. In general, the capacitor is only partially discharged.
"In order to test the latching magnet, i.e. in particular the winding for wire breakage, it is known to pass a test current through the winding which is too low to release the plunger. The test current is monitored, wherein an interruption in the current in particular indicates a wire breakage."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "An embodiment is directed to a solution for testing the latching magnet.
"An embodiment discloses a method and an embodiment discloses a test device.
"An embodiment, based on the method, provides that the circuit is closed for a second closing time for test purposes, which closing time is so short that no separation of the contact elements by the actuator takes place, and that a test is performed during the closure to ascertain whether a current is flowing via the winding of the latching magnet. This solution makes use of the fact that the current for actuating the actuator needs to flow with a certain (preset) intensity for a certain (preset) time.
"Based on an embodiment of the test device, the test device a) closes the circuit for test purposes for a closing time, which is so short that no separation of the contact elements by the actuator takes place, and b) tests in each case, during the closing time, whether there is a current flowing via the winding of the latching magnet."
For more information, see this patent: Fischer, Andreas; Widmann, Stefan. Method for Testing a Latching Magnet of a Switch and Test Device for the Latching Magnet. U.S. Patent Number 9726727, filed February 3, 2015, and published online on August 8, 2017. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=9726727.PN.&OS=PN/9726727RS=PN/9726727
Keywords for this news article include: SIEMENS AKTIENGESELLSCHAFT.
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