This article is originated from an accident of high voltage tuning reactors burnout caused by errors of type selection and design of reactor.Through the correct guidance of type selection and design calculation of foreign power capacitors

re-thinking of design and type selection of tuning reactor is initiated further

showing that mismatching of design capacity of high voltage tuning core reactor brings serious harm to the system.And

finally

different types of incorrect matching of high voltage tuning iron core reactor （type selection is too big or small） will bring a definite hidden fault or danger to system stability

which provides good help for the treatment of similar fault.