Tripping mechanism and surge protection device equipped with tripping mechanism

Abstract

The invention discloses a tripping mechanism and a surge protection device equipped with the tripping mechanism. The tripping mechanism comprises a base, a push-off piece, a traction component, an interception piece and a blockage point, wherein an electrode connecting component of a to-be-tripped protective device is welded to an electrode connecting point of the to-be-tripped protective device through soldering tin; one end of the push-off piece is rotatably mounted on the base, and the other end of the push-off piece presses the electrode connecting component downwards through the tractionof the traction component; and the interception piece is rotatably mounted on the push-off piece, and the blockage point is fixed on the base. When the soldering tin on an electrode point is molten, the push-off piece which presses the electrode downward continuously presses and moves downwards under the continuous traction of the traction component so as to pull the interception piece to move therewith; and the interception piece is blocked by virtue of the blockage point and then rotates, one end of the interception piece can utilize the blockage force of the blockage point, and thus the relative other end of the interception piece is rotated towards the electrode to the space between the electrode point and the electrode.

Description

technical field [0001] The invention relates to the field of lightning protection equipment, in particular to a tripping mechanism and a surge protector equipped with the tripping mechanism. Background technique [0002] The tripping mechanism and tripping monitoring or indication of the surge protector are the necessary mechanisms for the safe operation of the surge protector. The current tripping mechanism mostly adopts the thermal tripping method, which mainly includes push-off type and cut-off type. Its representative organizations are as follows: figure 1 and figure 2 shown. The principle is that when the surge protector fails to generate heat, the low-temperature welding at the electrode connection point in the figure melts, and the contact electrodes are separated, thereby achieving the purpose of tripping. [0003] figure 1 The push-off mechanism is mainly composed of surge protector (ie surge protector) connecting electrode A, push-off piece B and spring F. Whe...

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Problems solved by technology

[0005] but either figure 1 The push-off mechanism is still figure 2 There are examples of tripping failures in the actual use and experiments of the cut-off mechanism

The reason is figure 1 The release mechanism has insufficient separation range and occasional wire drawing of welding materials, so that the distance between the electrode of the surge protector and the electrode welding point of the varistor is not enough, resulting in arc discharge

figure 2 In order to make the mechanism run stably, the breaking mechanism of the varistor adopts a large-area cutting piece, but when the piezoresistor heats up, there is a phenomenon that the breaking piece deviates, and at the same time, due to the thickness limit of the spacer in the process, there is a breakdown phenomenon

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