METHOD FOR MEASURING DC CHARGING LIFE OF ZNO ELEMENT

摘要

PURPOSE:To enable the concrete calculation of a DC charging life by detecting leakage current from the temp. rising condition of an element and the changing condition in the electrical characteristic of said element and discriminating the life characteristic of the element. CONSTITUTION:DC is charged on a ZnO element and the relation between leak current and charging time is made by utilizing the continuous increase of the leak current generated at said time on account of a change in the electrical characteristic of the element and taking the temp. rise of the element into consideration for the leak current. A current-time curve is drawn by using actually measured heat radiating conditions and performing repetitive operation with a computer, and the time till thermal runaway is calculated. The leak current is thus detected from the temp. rising condition of the element and the changing condition in the electrical characteristic of the element and the life characteristic of the element is discriminated from the result of the measurement when the current values attains a prescribed value or above, whereby the DC charging life is concretely calculated.