Method of installing traction dollies under plus or minus 500 kV converter transformer with oil and accessories

Abstract

The present invention relates to a method of installing traction dollies under a plus or minus 500 kV converter transformer with oil and accessories. The method comprises the steps of setting two sets of jacks ( two jacks in each set) at a casing pipe at a valve-side of the converter transformer and at a cooler side respectively, and using the two sets of jacks to alternately jack the valve side and the cooler side of the converter transformer and alternately heighten the insurance supporting wooden stacks at the two sides until the traction dollies can come in and go out fully; orderly disassembling the jacks and the insurance supporting wooden stacks at the valve side and the cooler side of the converter transformer for a short time, orderly pulling the two traction dollies to the bottom of the converter transformer, penetrating the bolts in the connecting holes of the traction dollies and the converter transformer, and then immediately assembling and recovering the disassembled insurance supporting wooden stacks and operating the jacks to recover the stress supporting states of the jacks and the insurance supporting wooden stacks; then operating the jacks to jack and return repeatedly, alternately withdrawing the skids on the supporting wooden stacks until all weight of the converter transformer falls on the two traction dollies. According to the present invention, the traction dollies can be installed under the installed and tested converter transformer safely and reliably.

Description

technical field [0001] The invention relates to the technical field of electric power construction methods, in particular to a method for installing a traction trolley after installing accessories, oil filling, electrical tests and BOX-IN fixed parts of the converter transformer for a large ±500kV converter transformer. Background technique [0002] In recent years, DC transmission projects have been more and more widely used in power grids due to their large transmission capacity and low line loss. The converter transformer is the core equipment of the converter station. It is heavy and expensive, and it is more difficult to install and place than conventional power transformers of the same voltage level. Due to the limitation of the special layout of the converter station, the converter transformer is generally installed in an open space, and after the test is completed, it is pulled to the operating position and put in place. Due to the large volume and heavy weight of t...

AI Technical Summary

Problems solved by technology

In this way, after the installation and test are completed, the converter transformer with a total weight of more than 420 tons needs to be lifted by about 800 mm, and then the traction trolley is installed at the bottom of the converter transformer. The safety risk of the whole operation process is relatively high.

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