电压继电器指示灯闪烁现象的失效机理分析  

Failure Mechanism Analysis of Voltage Relay Indicator Light Flashing Phenomenon

作　　者：罗遐 梁营友 许洁璇 LUO Xia;LIANG Yingyou;XU Jiexuan(CEPREI,Guangzhou 511370,China)

机构地区：[1]工业与信息化部电子第五研究所,广东广州511370

出　　处：《电子产品可靠性与环境试验》2024年第4期21-24,共4页Electronic Product Reliability and Environmental Testing

基　　金：广东省重点领域研发计划(2022B0701180002)资助。

摘　　要：电压继电器作为电力系统中常用的保护器件得到了广泛的应用。根据组件失效分析的方法步骤对电压继电器现场出现的报警灯闪烁失效的原因进行了分析,结合继电器的电路和测试结果,采用无损分析和破坏性分析,定位到了失效的薄膜电容器。再进一步对失效的薄膜电容器进行分析,确定了薄膜电容器内部电极箔腐蚀氧化,造成容量下降,从而引起VCC电源电压波动,最终导致电压继电器报警灯闪烁。建议高湿环境下,电压继电器需采用更好的封装,避免薄膜电容氧化腐蚀。Voltage relays are widely used in power systems as protective devices.The causes of voltage relay indicator light flashing phenomenon are analyzed based on the failure analysis method of PCBA.Combined with the circuit and test results of the relay,the failed thin film capacitor is located through non-destructive analysis and destructive analysis step by step.After further analysis of the failed thin film,it is confirmed that the internal electrode foil of the thin film capacitor is corroded and oxidized,resulting in a decrease in capacity,which causes the fluctuations of VCC power supply,and finally causes the alarm light flashing of voltage relay.It is recommended that using better packaging in high humidity environments to avoid oxidation and corrosion of thin film capacitors.

关 键 词：电压继电器 报警灯闪烁 薄膜电容器 腐蚀 失效机理 

分 类 号：TM581[电气工程—电器]