Hoisting method of outer cover of main transformer

Abstract

The invention discloses a hoisting method of an outer cover of a main transformer, which comprises the following steps: (1) preparing before hoisting; (2) trying to hoist: hoisting is slowly started to guarantee that all hoisting ropes are stressed; a round steel temporary positioning bar passes through four-corner bolt holes of the main transformer from top to bottom, and four sway ropes are tied on the top; the center-of-gravity shift condition of the main transformer is checked; a hoisting hole on a hoisting tool is adjusted according to the hoisting center-of-gravity shift condition; the optimum balance point of the hoisting cover is found; and the balance while hoisting the outer cover of the main transformer is guaranteed by utilizing a lever principle; (3) hoisting; and (4) hoisting back. In the hoisting course, the outer cover of the main transformer is vertically hoisted so as to accurately grasp the center of gravity, thus preventing from tilting and avoiding crash or damage in the courses of hoisting and reassembling, ensuring better safety performance of the whole cover-hoisting operation and improving operating efficiency and quality.

Description

technical field [0001] The invention belongs to the technical field of substation maintenance, and in particular relates to a hoisting method for a main transformer cover. Background technique [0002] The maintenance of the main transformer is a complicated task, the workload is heavy, and the maintenance time is long, and the long-term power failure will directly affect the reliability of the power supply. The traditional lifting method is to remove the radiator, bushing and other accessories before the main transformer hanging cover, and install the radiator, bushing and other accessories after the main transformer cover is reinstalled. The task of the main transformer hanging cover is huge. The four-point lifting method is adopted for lifting the main transformer cover. The specific method is to use a crane as a lifting device, and use a steel wire sling, a lifting ring, etc. as a sling to lift the outer cover of the main transformer. Before hoisting the main transform...

AI Technical Summary

Problems solved by technology

[0005] In the second step, in order to improve the phenomenon of uneven stress on the lifting ropes due to the different effective lengths of the lifting ropes during the lifting process of the main transformer, U-shaped rings can be added to the lifting ropes with shorter effective lengths to make each lifting rope The effective length of the sling is equal to

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