METHOD FOR INSPECTING CAPACITORS.

摘要

IN A METHOD FOR JUDGING THE CONFORMITY OR NON-CONFORMITY OF A CAPACITOR FROM THE CHARGING CHARACTERISTIC AT THE TIME WHEN A DIRECT-CURRENT VOLTAGE IS APPLIED TO THE CAPACITOR, A THRESHOLD CURRENT VALUE IO OF THE DIELECTRIC POLARIZATION COMPONENT OF THE CAPACITOR IS DETERMINED IN ADVANCE, AN EVALUATION FUNCTION N(T) IS DETERMINED BASED ON A LOGARITHMIC VALUE OF THE DIFFERENCE BETWEEN THE MEASURED CHARGING CURRENT VALUE M(T) OF THE CAPACITOR AND THE THRESHOLD CURRENT VALUE IO OR THE DIFFERENCE BETWEEN THEIR LOGARITHMIC VALUES, AND THE EVALUATION FUNCTION N(T) IS APPROXIMATED TO A QUADRATIC CURVE. WHEN THE QUADRATIC COEFFICIENT OF THE QUADRATIC APPROXIMATION EQUATION HAS A PLUS SIGN THE CAPACITOR IS JUDGED TO BE NON-CONFORMING, AND WHEN THE COEFFICIENT HAS A MINUS SIGN, THE CAPACITOR IS CONFORMING.(FIGURE 6)