Method for sectioning with a section switch a medium-voltage electric power distribution line exhibiting a disturbance, section switch for medium-voltage electric power distribution line applicable thereon and electronic circuit for detecting a fault current and comprised by said section switch

A section switch for medium-voltage electric power distribution lines, said section switch being of the kind suitable to be installed on auxiliary branches of a distribution network wherein a main line is protected by an automatic reset circuit breaker, said section switch comprising:

• an opening mechanism having a coil;
• and an electronic circuit comprising:
• a power source for both said electronic circuit and the coil of the opening mechanism;
• a detector to detect a current in said network having a wave form;
• and an analyzer to analyze said wave form to determine if said detected current in said network is either a transient fault current or a permanent fault current or a transformer input current or in-rush current.

An electronic circuit for detecting a fault current, said electronic circuit adapted for use with a section switch for medium-voltage distribution lines, said section switch being of the kind suitable to be installed on auxiliary branches of a distribution network wherein a main line is protected by an automatic reset circuit breaker, said section switch comprising an opening mechanism having a coil, said electronic circuit comprising:

• a power source for both said electronic circuit and the opening mechanism coil;
• a detector to detect a current in said network having a wave form;
• and
• an analyzer to analyze said wave form to determine if said detected current in said network is either a transient fault current or a permanent fault current or a transformer input current or in-rush current.