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Factors affecting relay reliability Sep 27, 2018

Reliability

Factors affecting relay reliability

1. The impact of the environment on the reliability of the relay: The average fault interval of the relay working under GB and SF is the highest, reaching 820,000h, while in the NU environment, it is only 60000h [2].

2 The impact of quality level on the reliability of the relay: When the relay of A1 quality grade is selected, the average fault interval can reach 3660000h, and the average fault interval of the relay with C grade is 110000, the difference between them is 33 times, and the quality level of the relay can be seen. The impact on its reliability is very large [2].

The effect of the three-contact form on the reliability of the relay: the contact form of the relay also affects its reliability. The reliability of the single-throw type relay is higher than that of the double-throw type relay of the same number of tools, and the number of passes increases. The reliability is gradually reduced, and the average time between failures of single-pole single-throw relays is 5.5 times that of four-pole double-throw relays [2].

4 Influence of structure type on relay reliability: There are 24 types of relay structures, and different types have an impact on their reliability [2].

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5 The effect of temperature on relay reliability: The operating temperature range of the relay is between -25 and 70 °C. As the temperature increases, the average fault interval of the relay gradually decreases [2].

6 The effect of the action rate on the reliability of the relay: As the action rate of the relay increases, the mean time between failures is exponentially decreasing [2]. Therefore, if the designed circuit requires the relay to operate at a very high rate, then the relay needs to be carefully checked during circuit repair in order to replace it in time [2].

7 The effect of current ratio on the reliability of the relay: The so-called current ratio is the ratio of the working current of the relay to the rated load current. The current ratio has a great influence on the reliability of the relay. Especially when the current ratio is greater than 0.1, the average fault interval decreases rapidly. When the current ratio is less than 0.1, the average fault interval is basically unchanged. Therefore, the rated current should be selected in the circuit design. Larger load to reduce the current ratio, which ensures that the relay and even the entire circuit are not degraded due to fluctuations in operating current.