Direct-current switch cabinet and channel steel connection insulation technology in metro traction substation

Abstract

The invention discloses a direct-current switch cabinet and channel steel connection insulation technology in a metro traction substation. The direct-current switch cabinet and channel steel connection insulation technology comprises basic channel steel and a switch cabinet body, wherein an insulating plate is arranged on the basic channel steel; the switch cabinet body is arranged above the insulating plate; an epoxy resin coating is arranged between the switch cabinet body and the insulating body; a connecting piece is fixed on the inner side of the lower end of the switch cabinet body through a fixing bolt; a fixing hole is formed in the insulating plate; silicon grease is smeared in the fixing hole; an insulating bolt is arranged in the fixing hole; an insulating spacer and an insulating sleeve are arranged on the exterior of the insulating bolt; and an insulating nut is arranged at the end part of the insulating bolt. The direct-current switch cabinet and channel steel connectioninsulation technology disclosed by the invention has the following beneficial effects: the technology and the construction method are greatly improved from the change of construction tool to the use of a novel material; and meanwhile, the construction efficiency is increased, the construction cost is saved, the working time is shortened, and the construction quality is guaranteed.

Description

technical field [0001] The invention relates to the technical field of subway construction, in particular to the connection and insulation technology of a DC switch cabinet and a channel steel in a subway traction substation. Background technique [0002] With the continuous improvement of the functions of large and medium-sized cities in various parts of our country, subway projects have been implemented in various places. In the subway traction substation, the DC system is the part directly connected to the catenary. It undertakes the important task of directly supplying power to the train. Its safe and stable operation is a prerequisite for the normal operation of the subway train. The DC switchgear is the main electrical equipment of the DC power supply system in the subway traction substation. Their safe and stable operation is a necessary prerequisite for the normal operation of the DC system of the traction substation. Therefore, the installation quality of the 1500V ...

AI Technical Summary

Problems solved by technology

At present, there are mainly the following problems in the installation of switchgear: (1) The foundation parts of the insulation board and the channel steel are damp and dust accumulates, the construction environment on site is complicated, the construction of each unit is different, the water in the cable interlayer is deep, and the lower part of the insulation board The phenomenon of water dripping is serious; (2) The deviation between the connection holes between the cabinet body and the channel steel is large, and pistol drills are used for drilling holes on site. Secondary reaming, which reduces the tightness of the hole; (3) The fixing bolts are used in conjunction with galvanized bolts and insulating gaskets. In principle, the switchgear cabinet is isolated from the basic channel steel, which has an insulating effect. During the installation process, since there is no insulation between the bolts and the cabinet fixing piece, and the deviation of the holes, it is easy to cause the bolts to directly contact with the cabinet connecting piece, and there is an invisible problem, which directly leads to insulation drop or frame voltage leakage; ( 4) Bolt holes are poorly sealed. Since the subway was opened late after the equipment was installed, the construction site was not fully completed, and other construction units still need to continue construction, which may easily cause dust and debris to spread into the holes.

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