Abstract
To evaluate the electrical contact behaviors of silver metal oxide contact materials in relays application more accurately, and to guide the selection of contact materials, the test device and testing method for simulating electrical contact performance in relays application were analyzed in this paper. The electrical contact simulation test system was designed and developed, which can easily simulate contact materials. The contact resistance, static force and rebound energy degradation parameters of AgSnO2, AgCdO and AgNi contact materials under the same load conditions were obtained through experimental research, the contact resistance and arcing energy degradation parameters of AgSnO2 under different opening distances were acquired at the same time. The result indicated that accurate data are received by the electrical contact simulation testing method. Finally, based on the test data, the degradation performance of three selected test materials was tested, and the failure mechanism of AgSnO2 materials was analyzed.
Highlights
The electrical properties of the contact material play a key role in the reliability of the automation system
Because the silver-based contact material has good conductivity and thermal conductivity and has high oxidation resistance and small contact resistance, it is widely used in the field of low-voltage relays application [15]
Main functions: The system can change contact materials which were processed into rivet shapes freely to carry out electrical contact simulation test; adjust the mechanical parameters arbitrarily, including contact opening distance, pushrod position, empty travel and super-path, etc., to assist in obtaining high-precision test data; real-time monitoring of the contact voltage, contact current, contact voltage drop and force signal in each switching/closing process; the static force, contact resistance, arc energy, rebound energy and relevant time parameters in each operation process were calculated according to the comprehensive electrical performance parameter program
Summary
The electrical properties of the contact material play a key role in the reliability of the automation system. The latter method can make a real analysis of the action characteristics of the actual electrical apparatus, it is limited by the structure of the electrical apparatus themselves, so it is impossible to change the mechanical parameters and accurately observe the erosion condition of the surface of the electrical equipment In this test system, the electromagnet coil is used to drive the pushrod to act on the moving reed, and the dynamic and static contact points are used to simulate the on-off process of the electrical switch
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