Aging Performance of DC-Link Capacitors Under Alternating Humid and Thermal Environment

Metallized film capacitors are now widely used in DC-Link capacitors. Voltage, temperature and humidity are the three main factors affecting capacitor aging. This paper mainly combines the common alternating humid and thermal environment in the practical application of DC-Link metallized film capacitors and the existing alternating humid and thermal standards, proposes to build an alternating humid and thermal aging platform for the alternating humid and thermal aging conditions of DC-Link capacitors, conducts alternating humid and thermal aging of two groups of capacitors, and studies the alternating humid and thermal aging characteristics of the two groups of capacitors. The results show that Group 2 capacitors have better resistance to alternating humid and thermal aging, and the Group 1 capacitors is more susceptible to moisture intrusion.