Diagnostic solutions for medium voltage switching apparatuses

A diagnostic method to check operating conditions of one or more components of one or more electric poles of a medium voltage switching apparatus,

• wherein said switching apparatus comprises said electric poles, each electrically coupleable with a corresponding electric line,
• wherein said switching apparatus further comprises:
• for each electric pole, a fixed contact and a movable contact, said movable contact being reversibly movable between a decoupled position from said fixed contact and a coupled position with said fixed contact, said movable contact moving from said decoupled position to said coupled position during a closing manoeuvre of the switching apparatus and moving from said coupled position to said decoupled position during an opening manoeuvre of the switching apparatus;
• a servomotor unit including at least one servomotor and adapted to provide a servomotor status signal indicative of an angular position of said at least one servomotor;
• a motion transmission assembly adapted to mechanically couple said servomotor unit with the movable contact of said one or more electric poles;
• and
• a control unit to control an operation of said switching apparatus, the diagnostic method comprising:
• basing on a selectable ideal position curve, obtaining one or more first curves indicative of an ideal behaviour of said switching apparatus, during the opening manoeuvre or the closing manoeuvre of the switching apparatus;
• basing on detection signals provided by a closed-loop control arrangement of said control unit by processing said servomotor status signal, calculating one or more second curves indicative of an actual behaviour of said switching apparatus, during the opening manoeuvre or the closing manoeuvre of said switching apparatus;
• and
• carrying out a comparison procedure among said one or more first curves and the one or more second curves.