Abstract: A deterioration regeneration system includes a pre-post regeneration determination part configured to determine whether or not to execute, with respect to an electric contact to which an electrical or mechanical first external action is applied during an operation of a later-stage device, a deterioration regeneration process of regenerating a connection performance that has been deteriorated due to an increase in a contact resistance of the electric contact, and a deterioration regeneration part configured to execute a process of removing a foreign object present at the electric contact by applying a second external action to the electric contact, as the deterioration regeneration process, according to the determined result from the pre-post regeneration determination part, the second external action being of the same kind as the first external action and larger than the first external action.

Abstract: A deterioration degree diagnosis device includes a measurement unit and a diagnosis unit. The measurement unit measures an impedance related to a contact resistance of an electrical connection portion by measuring an AC voltage between metal members and an AC current flowing between the metal members in a state where an AC signal of a predetermined frequency is applied to an electric circuit that connects two metal members in contact via the electrical connection portion. The diagnosis unit diagnoses a deterioration degree of the electrical connection portion based on a reactance component value in the impedance measured by the measurement unit.

Abstract: A deterioration regeneration system includes a pre-post regeneration determination part configured to determine whether or not to execute, with respect to an electric contact to which an electrical or mechanical first external action is applied during an operation of a later-stage device, a deterioration regeneration process of regenerating a connection performance that has been deteriorated due to an increase in a contact resistance of the electric contact, and a deterioration regeneration part configured to execute a process of removing a foreign object present at the electric contact by applying a second external action to the electric contact, as the deterioration regeneration process, according to the determined result from the pre-post regeneration determination part, the second external action being of the same kind as the first external action and larger than the first external action.

Abstract: A terminal fitting structure includes a first terminal which includes a protruding convex portion, and a second terminal to be inserted and fitted into the first terminal, the second terminal including a conducting portion which is configured to be in contact with the convex portion to be electrically connected when fitting the second terminal into the first terminal. A silver-based plating layer is formed on an outermost surface of the conducting portion. A tin-based plating layer is formed on an outermost surface of the convex portion.

Abstract: A deterioration degree diagnosis device includes a measurement unit and a diagnosis unit. The measurement unit measures an impedance related to a contact resistance of an electrical connection portion by measuring an AC voltage between metal members and an AC current flowing between the metal members in a state where an AC signal of a predetermined frequency is applied to an electric circuit that connects two metal members in contact via the electrical connection portion. The diagnosis unit diagnoses a deterioration degree of the electrical connection portion based on a reactance component value in the impedance measured by the measurement unit.