RESISTANCE INSERTION TYPE CIRCUIT-BREAKER

摘要

A high-voltage circuit-breaker comprises a first insulative support column carrying a first current terminal and a pivoting cut-off arm provided with a first contact. An insulative column rotates to maneuver the cut-off arm. A second insulative support column carries a second current terminal and a jaw-type second contact cooperating with the first contact when the circuit-breaker is closed. The pivoting arm rotates about its axis through 90 DEG at the start of an opening maneuver or at the end of a closing maneuver to close the jaw on opening the circuit-breaker and to open the jaw on closing the circuit-breaker. The cut-off arm is extended by a cylindrical assembly containing a resistance and comprising a metal exterior tubular portion connected electrically to the resistance. The tubular portion comes into contact at the end of a circuit-breaker closing maneuver or at the beginning of a circuit-breaker opening maneuver with two pole horns mechanically attached to the second column and electrically connected to the second current terminal. The resistance is then inserted into the circuit of the circuit-breaker via the pole horns and the tubular portion. The resistance is short-circuited when the cut-off arm has rotated 90 DEG therefor about its axis at the end of the closing maneuver.