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Testing device for assessment of elastic materials for transmission of force impulses in ultra fast electrical switches - modelling
Circuit breakers and various types of switches are installed at all voltage levels in the power system. The most common way to operate them is to use an actuator or drive that relies on stored energy in springs to perform the operation. Such actuators or drives give a typical operating time in the order of 20-30 ms or longer.
For some apparatus or equipment there is a need for operating times much faster than that; typically in the ms range. One physical principle that can be used for a fast drive or actuator is to use the repelling force between two current carrying coils. If one of the coils is fixed and the other free to move, it is possible to achieve a very fast operation by releasing stored energy from a capacitor through the coils. This type of drive or actuator is often referred to as a Thomson coil.
To transmit the generated force impulse to the movable part of an ultra fast electrical switch an elastic material is used. The repetitive force impulses can give rise to stresses up to 100 MPa and the knowledge regarding the endurance and fatigue of tentative elastic materials needs to be improved.
Therefore, a testing device for assessment of elastic materials for transmission of force impulses will be developed.
Based on literature studies the task in this master thesis project is to specify and outline a testing device for assessment of elastic materials for transmission of force impulses in ultra fast electrical switches.
A simulation model of the testing device comprising a so-called Thomson coil will be developed and used to dimension the device such that it fulfils the set up specification. The work will lead to sufficient design data for the build-up of the testing device.
KTH, Göran Engdahl, 070-6584851, [email protected]
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