To improve the insulation diagnosis of a medium-voltage (MV) switchgear. we have developed a four-terminal surface current sensor and a method to estimate the direction of partial discharge occurrence. In this method. the accuracy of the direction estimation is improved by referring only to the direct wave. https://wxbmqm2qx7v9.blog2freedom.com/34914807/l-autonomie-dans-l-invisibilité-les-accompagnantes-des-élèves-en-situation-de-handicap