10kV side low-voltage bus connection structure of transformer substation and corresponding planning and transformation method

Abstract

The invention provides a transformer substation 10kV side low-voltage bus connection structure, which is characterized in that in a 110kV transformer substation, the 10kV side comprises six sections of 10kV buses, each section of bus adopts an annular wiring mode, and each section of bus is powered by two main transformers; two 10 kV lines are adopted for loop closing operation at each section of bus, and the average load rate of the lines is controlled to be below 50%; wherein a connection circuit breaker is arranged between buses of two adjacent ring networks, and the ring closing unit of each ring network is connected with the ring closing units of other substations through a connection line so as to realize power-on transfer when the line of the ring network fails, and the load of the ring network is completely transferred to the other ring network through the connection line. The invention further provides a corresponding planning and transformation method. According to the invention, the total number of outgoing lines at the 10kV side of the transformer substation can be increased, the power supply capability of the whole network is improved, and the utilization rate of power grid equipment is improved.

Description

technical field [0001] The invention relates to the technical field related to substations, in particular to a connection structure of low-voltage busbars on the 10kV side of a substation and a corresponding planning and reconstruction method. Background technique [0002] With the continuous development of large cities and the growth of high-reliability demand loads in cities, how to use scarce land resources and limited power grid equipment assets to achieve improvement on the basis of existing substations and 10kV power supply systems The purpose of grid power supply reliability and power supply capacity. [0003] Such as figure 1 As shown in the figure, it shows a bus wiring diagram of an existing 110kV substation. It can be seen from the above that in the existing traditional 110kV substation (take the common single main transformer 63MVA as an example), the 10kV side is generally 4-section bus connection, and the 10kV outgoing line of each main transformer low-voltag...

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Problems solved by technology

In this mode, there is a waste of land construction resources for substations with certain resources, or it is difficult to adjust loads between different 10kV lines

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