动车组大功率触点元件电寿命试验方法研究OA

As a core control component in the EMU traction system,the electrical life of high-power DC contactors directly affects the operational reliability of the traction system.This study designed a dedicated test system and proposed a comprehensive test method that combines rated working condition life test and ultimate breaking capacity exploration aiming at the electrical life evaluation requirements of this type of contact element.By constructing a high-power electrical circuit and a high-precision measurement system,precise control of the contactor breaking process and acquisition of key parameters are realized.The rated breaking test was terminated at 300 operations due to the occurrence of open flames,revealing a potential failure mode beyond conventional electrical parameter monitoring.The step-breaking current test determined that the contactor's ultimate breaking capacity is 2900 A,with a safety margin of 16%.The established test method effectively identify the potential reliability risks of contactors,providing an important support for product improvement and reliability evaluation.