Grounding method and grounding system of GIL electric power shield pipe gallery

Abstract

The invention provides a grounding method and a grounding system of a GIL electric power shield pipe gallery. The grounding method comprises the following steps that connecting positions are reservedon components of the shield pipe gallery; reserved connecting pieces are correspondingly arranged according to the reserved connecting positions; post-cast strip steel bars of the shield pipe galleryare connected through the reserved connecting pieces; steel bars in the adjacent components are connected through the post-cast strip steel bars to form a natural grounding body; and GIL grounding isachieved through the natural grounding body. According to the grounding method and the grounding system, the maximization of the area of a grounding conductor can be guaranteed so as to reduce the grounding impedance value, so that the design investment of a special grounding grid can be reduced while the personnel safety is guaranteed, the scheme is simple, and the construction is convenient.

Description

Technical field [0001] The invention relates to the technical field of grounding system design, in particular to a grounding method for a GIL power shield tunnel and a grounding system for a GIL power shield tunnel. Background technique [0002] At present, due to limited land resources and increasing public awareness of environmental protection, it is becoming more and more difficult to acquire land for overhead line corridors. As the scale of cities increases, the urban power consumption density is also increasing. It is necessary to lay high-voltage and large-capacity undergrounds in urban areas. Transmission lines, these factors are conducive to the application of GIL (Gas-Insulated transmission Lines) in the power system. The main advantage of GIL equipment is that it has a large transmission capacity, but the cost is higher than that of cables. Usually, the advantages of GIL equipment can be fully utilized at voltage levels of 500kV and above. At present, my country’s 500kV...

AI Technical Summary

Problems solved by technology

The main advantage of GIL equipment lies in its large transmission capacity, but the cost is higher than that of cables. Usually, the advantages of GIL equipment can be fully utilized at a voltage level of 500kV and above. At present, my country's 500kV and above power grids usually have the characteristics of large short-circuit current, so GIL tubes The corridor has high requirements on the design of the grounding system

[0003] However, the current grounding system designed for the requirements of pipe racks is mainly for comprehensive pipe racks or cable pipe racks. However, due to the relatively small short-circuit current of this type of pipe rack project, a special grounding body is usually laid on the pipe rack and used to work on both sides. However, if the short-circuit current is too large, or the resistivity of the working well area is high, the grounding scheme will be difficult, and additional measures should be taken to solve the problem.

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