Method for testing self-holding magnets of switches and testing device for carrying out the method
An inspection device and self-maintaining technology, applied in the direction of measuring device, electromagnetic relay, electromagnetic relay detailed information, etc., can solve the problem of high inspection cost and so on
Active Publication Date: 2020-06-16
SIEMENS AG
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- Description
- Claims
- Application Information
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Problems solved by technology
[0004] The disadvantage here is that such a test is relatively expensive
Method used
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Embodiment Construction
[0016] The switch 1 has a switching contact 2 which has mechanical contact elements 3 , 4 which, when the switching contact 2 is closed, bear against each other as shown in the figure. The switching contact 2 is plugged into the line L. In order to interrupt the current flowing through the line L, the switching contact 2 is opened by separating the contact elements 3 , 4 from one another.
[0017] Also belonging to the switch 1 is an electronic triggering unit ETU, which in each case monitors the current flow through the switching contacts 2 (contact elements 3 , 4 abutting against each other) and checks here whether a predetermined current-dependent triggering condition is fulfilled. The trigger condition here is, for example, the exceeding of a predetermined current threshold.
[0018] To detect the current flowing through the line L, the current-proportional voltage signal of the sensor coil 9 which is arranged in the magnetic field (in the region) of the line L is used. ...
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The invention relates to a method for testing a self-retaining magnet of a switch, and to a testing device for carrying out the method, wherein the switch comprises: a) a switch contact, which consists of a contact element for opening the switch contact to mechanically separated from one another, b) an electronic triggering unit, which monitors the current through the contact elements and checks whether a current-dependent triggering condition is fulfilled, c) an actuator, which, if the triggering condition of the triggering unit is fulfilled, The contact elements are actuated by the self-holding magnets and separated by the actuator after actuation, and d) an electrical energy store which is charged to a predetermined voltage before triggering and discharged by the self-holding magnets for separating the contact elements. To simplify the test regulations for self-retaining magnets, the voltage of the energy store after triggering after a predetermined duration is compared with a predetermined reference value, and a fault signal is output if the voltage of the energy store is still above the reference value.
Description
technical field [0001] The invention relates to a method for testing a self-retaining magnet of a switch and a testing device for carrying out the method according to the subject matter of the present application. Background technique [0002] Switches in the low-voltage field with electromechanical triggers are known, for example, as power protection switches. The switch interrupts the flowing current, for example, if a predetermined current value is exceeded. The trigger comprises a trigger unit which is designed as a self-retaining magnet (magnetic latch) with a permanent magnet, a winding and a ferromagnetic tappet, wherein the tappet is controlled by the magnetic field of the permanent magnet. Attract against spring force. Triggering is achieved in that a winding arranged on the permanent magnet generates a counter-magnetic field which compensates the magnetic field of the permanent magnet in the area of the tappet in such a way that the tappet for tripping the swit...
Claims
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IPC IPC(8): G01R31/327G01R31/54G01R31/72
CPCG01R31/3278H01H47/002G01R31/333H01H50/20H01H50/32H01H50/64H01H51/01
Inventor A·菲舍尔S·维德曼
Owner SIEMENS AG