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How to extend the service life of relay power switchRelease time:2023/5/22 13:05:19 |
| With the excellent performance of electromechanical engineering relays once again playing an important role in military and aerospace engineering applications, the demand for relay products is also increasing day by day. The service life of relays is one of the factors that measure the quality of a product. Therefore, during the development process of the product, technical engineers will conduct NTC testing on the relay NTC Life Test NTC life test describes peak surge protection and stable step function current pulse signal waveform to determine all practical development trends. As expected, the rapid cycling of relay combinations did indeed increase their respective peak and stepper motor current levels over time; However, even at very low NTC values, surge protection is less than the rated current of larger relay contacts. Tests have shown that for a 1-ohm NTC, the main gain value for peak surge voltage is 36%, which increases to 58% when a 5-ohm NTC is on the circuit board. The increase in step current is much softer, ranging from 6% to a maximum of 38%. During the testing period, the NTC casing temperature was compared and slightly increased by 6 to 7 ° F or 8% to 10% compared to the natural ambient temperature. The small change in NTC temperature confirms that it can harm the peak value and stepper motor current level during the relay life testing cycle system stage. Contact evaluation, NTC post life testing After the end of the life test, cut each of the five relays from the NTC/relay transfer switch and conduct electrical testing to confirm that each relay has reached the test parameter limit after reaching its service life. Looking back at the normally open and internally movable contacts in the first relay indicates that the actual contacts are subject to chemical corrosion and transfer as expected. The relay converted the full capacitive load without NTC current limit, and the detection terminated at a 26K cycle time, which is much lower than the 50K cycle time due to continuous contact welding. There are visual signs of adhesion and fracture of raw materials on the movable contact area, which is conducive to mechanical bonding between welding and moving friction surfaces. When the relay containing NTC on the circuit board is turned on and analyzed, a completely different visual effect story is told. According to the 1 ohm NTC conversion load, the relay may reduce raw material transmission by 40% to 50% and greatly reduce the impact of "cone and crater". Through detection, the relay switches based on the maximum resistor NTC (5 ohms), with slight raw material deposition on the open and close contacts, and relatively small corresponding pits on the movable contacts. |
