电子式漏电断路器双应力加速退化试验方案研究

Research on Accelerated Degradation Test Scheme with Two Accelerating Stresses of Electronic Leakage Circuit Breaker

漏电断路器属于高可靠性、长寿命产品,在短时间内无法获取足够的失效数据对其可靠性进行评估。在不改变漏电断路器失效机理的条件下,提出了双应力交叉步进加速退化试验方案,通过分析漏电断路器的失效机理,确定温度、湿度作为加速应力,选择双应力交叉步进的应力加载方式;根据Peck模型中加速因子的计算,选择应力组合方案,通过摸底试验选择性能退化特征量,并确定了试验样品数量、试验周期等试验参数,制定出试验程序。该方案有效解决了电子式漏电断路器可靠性评估试验样本多和试验时间长的问题。

Residual current circuit breakers are highly reliable and long-life products and therefore it is impossible to obtain sufficient failure data to evaluate their reliability in a short period.This paper proposed a dual-stress cross-step accelerated degradation test scheme under the condition of not changing the failure mechanism of the leakage circuit breaker.It analyzed the failure mechanism of the leakage circuit breaker and determined the temperature and humidity as the acceleration stress.Moreover,it selected the stress loading mode of double stress cross-stepping.This research chose the stress combination scheme according to the calculation of the acceleration factor in the Peck model,elected the characteristic quantity of performance degradation through the bottom-up test.It determined the testing parameter,such as the number of test samples and the test period.Besides,it formulated the test program.This study effectively solves the problems which excessive test samples and tediously long testing time for reliability evaluation of electronic leakage circuit breakers.