Research on Capacitor Aging Behavior and Prediction of Remaining Service Life

The AC filter capacitor is an important equipment of DC transmission projects, its safe and reliable operation is a key issue. The existing research lacks a comprehensive life assessment method for the aging stage of capacitors. For this reason, this paper investigates two groups of capacitors with different operating years, and obtains the change law of key aging characteristic quantities during the operation of capacitors by testing and analyzing the insulation performance and durability performance of the body capacitors and their internal materials after dissection; compares multiple characteristic quantities in the time domain, and summarizes the aging mechanism of capacitors; Based on the aging mechanism, a multidimensional assessment method of equipment life state for operation and maintenance is proposed, which provides some reference for predictive maintenance strategy.