Transformer substation high-voltage bus two-stage voltage reduction power taking method and station power wiring structure

Abstract

According to the substation high-voltage bus two-stage step-down power taking method and the substation electric wiring structure, a 330kV bus takes power and is connected with the 330kV bus through an HGIS circuit breaker, the first stage is changed into 10kV through a step-down transformer with the transformation ratio of 330 / 10kV, a lightning arrester is added to the 330kV side of the 330 / 10kV step-down transformer to achieve 330kV side overvoltage protection; and the second stage is changed into 0.38 kV through a step-down transformer with the transformation ratio of 10 / 0.38 kV, and a voltage transformer is additionally arranged on the 10kV side of the step-down transformer with the transformation ratio of 10 / 0.38 kV, so that voltage measurement is realized. According to the invention, the early investment of the project is saved, the construction and the installation are convenient, the installation, the maintenance and the operation are more convenient, safer and more reliable, and the method can be effectively applied to the actual project.

Description

technical field [0001] The invention belongs to the field of power transmission and transformation, and relates to a two-stage step-down step-down power-taking method of a high-voltage bus bar in a substation and a substation power connection structure. Background technique [0002] With the rapid development of power grid construction, the coverage of power grid construction is getting wider and wider. In order to strengthen the grid structure, more and more new substations were built in remote areas that were rarely covered in the past. few, and the distribution is sparse, there is often a difficult situation where there is no off-station power source within hundreds of kilometers of the newly-built site. If long-distance transmission is adopted, the overall demand power of the station load is very small, resulting in high transmission costs, large losses, and a large amount of line maintenance in the later period, which is very uneconomical; if new energy photovoltaics ar...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem of the inconvenient power supply outside the substation of the new substation in the remote area in the above-mentioned prior art, to provide a substation high-voltage bus two-stage step-down power supply method and a substation power connection structure, through the high-voltage bus through two Step-down to meet the demand of the load in the station, can effectively control the initial equipment investment, and the later operation and maintenance workload is small

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