The utility model relates to a sensor rapid replacement structure of an SF6 on-line
monitoring system, which comprises a high-
voltage switch cabinet and an SF6 monitoring sensor, the lower end of the SF6 monitoring sensor extends into the high-
voltage switch cabinet through a mounting port, a fixing device is arranged between the high-
voltage switch cabinet and the SF6 monitoring sensor, and the SF6 monitoring sensor is arranged in the fixing device. The fixing device comprises a connecting rod, a vertical rod, an
extrusion block, a fixing groove, a sliding block, a connecting shaft and an arc-shaped clamping block. According to the utility model, when the SF6 monitoring sensor extends into the high-voltage switch cabinet along the mounting port, the
extrusion block extrudes the sliding block in the fixing groove, so that the sliding block moves towards the sensor, the arc-shaped clamping block clamps and fixes the sensor, and when the
extrusion block completely enters the fixing groove, the arc-shaped clamping block cannot transversely move any more, so that the SF6 monitoring sensor is fixed. When the SF6 monitoring sensor is disassembled and replaced, only the sensor needs to be pulled out of the installation opening, a new sensor needs to be replaced, then the installation operation is repeated, the replacement steps are simple, the consumed time is short, and rapid replacement of the SF6 monitoring sensor is achieved.