| 摘要 |
A breaker facilitating rapid movement and elongation of an arc comprises a static contact (1), a moving contact (3), and an arc-extinguishing chamber (2). A contact surface (14) of an electrical contact (13) of the static contact and an electrical contact (32) of the moving contact and a bottom plane (4) of a base form an acute angle that is located in the first quadrant. The moving contact comprises a conducting rod (31) and the electrical contact. The conducting rod has a projecting portion (314). The electrical contact is welded on an end surface of the projecting portion in a direction facing the electrical contact of the static contact. The arc-extinguishing chamber is a grid-plate arc-extinguishing chamber. The bottom and the top of the arc-extinguishing chamber are respectively provided with arc-ignition grid plates (24, 22). The arc-ignition grid plate on the bottom of the arc-extinguishing chamber is arranged lower than the electrical contact of the static contact. The arc-ignition grid plate on the top of the arc-extinguishing chamber is arranged higher than the maximum position of the electrical contact of the moving contact when the moving contact is opened. The breaker facilitates rapid movement and elongation of the arc generated on the electrical contacts of the moving contact and the static contact when the moving contact is opened. By means of the breaker, the arc moving speed and the arc drawing length of the breaker can be effectively improved without changing the operating mechanism and the housing of an existing breaker. When the breaker is applied in a photovoltaic direct current breaker, the working voltage of the breaker can be raised, and the problems of large volume and high power consumption can be solved. |
