Contact method in double-looped network nodes of 10-kV circuit

Abstract

The invention relates to a contact method in double-looped network nodes of a 10-kV circuit. The contact method comprises the following steps of (1) determining a wiring mode to form a double-looped network, wherein the double-looped network structure is a looped network formed by two circuits respectively from two substations, looped network circuits are lay in parallel, each looped network circuit adopts a copper cable to connect, the copper cables are connected by a looped network cabinet, and two looped networks are formed by connecting nine looped network cabinets in series; and (2) determining a contact node, wherein the contact node comprises an opened annular contact point and a substation contact point, the opened annular contact point serves as a contact point of two circuits in an unified looped network circuit and is arranged at the middle position of the looped network and selected in the same looped network cabinet, and the substation contact point serves as contact between outgoing lines of the same substation and is selected at the middle position of each circuit. According to the method disclosed by the invention, the maximum allowable value of the load rate of the original circuit is improved to 56% from 50%, the average transfer of a load is facilitated, and the power grid is ensured to still run reliably after load transferring.

Description

technical field [0001] The invention belongs to the technical field of electric power engineering in power grid transformation, in particular to a method for inter-node connection of double-ring network nodes of a 10 kV line. Background technique [0002] At present, the power grid structure presents the characteristics of multi-branch, multi-connection, and complex structure, especially the cable line, there is no clear distinction between the main line and the branch line, and there are multiple connections between the same substation and different substations. With the development of automation technology, the automatic research and judgment function of distribution automation has become a major trend in the fault handling of distribution networks. The non-faulty part of the load is transferred to other lines, so as to ensure the reliable power consumption of users. If the grid structure is too complex and there are too many connections, on the one hand, it will increase...

AI Technical Summary

Problems solved by technology

[0004] At present, the line is connected by wiring, and the line has too many branches, resulting in a messy line structure. Each line contains two or more branches, and one of the branches is in contact with other lines. In the process of load transfer, it is also necessary to consider the problem of branch load transfer. 3 as an example, the fault point is in the cable between 1# ring main unit and 2# ring main unit. The increase is too large; the contact position is concentrated at the end of the line, which causes the line load to be transferred when the line load is transferred, so as to figure 1 Take line 2 as an example, line 2 is faulty, since its connection with line 1 and line 8 is in the 6# ring main unit, no matter which line is transferred, all line loads after the fault point need to be transferred to the two lines Lines bring a lot of load transfer pressure, so the maximum load rate of the line is required to be less than 50% of the line carrying capacity; the ring main unit has three types: 1 in 3 out, 2 in 6 out, 2 in 4 out, considering the later power grid According to the needs of construction and load opening, there will be the possibility of secondary transformation and investment

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