Energy-saving and environment-friendly high-voltage closed bus

Abstract

The invention provides an energy-saving and environment-friendly high-voltage closed bus. The bus comprises a shell and three busbars, wherein the three busbars are uniformly and fixedly arranged in the shell; and the included angle alpha between the adjacent busbars is 120 degrees. The bus has the following beneficial effects: as the three busbars are uniformly and fixedly arranged in the shell and the included angle alpha between the adjacent busbars is 120 degrees, the synthetic magnetic potential among the busbars is zero; and during distance power transmission, the three busbars are uniformly symmetric, thus avoiding the problem of complex phase change needing to be considered due to the proximity effect and nonuniform three-phase power transmission loss, so the bus is more convenient and safer to use.

Description

technical field [0001] The invention relates to a closed busbar, in particular to a high-voltage closed busbar, which belongs to the technical field of power transmission equipment. Background technique [0002] With the rapid development of the power system, there are more and more power transmission and distribution methods using power cables. The increase in power cable lines leads to a sharp increase in the capacitive current of the system. When grounding, the arc cannot be extinguished due to excessive capacitive current, and the overvoltage caused by the intermittent arc grounding will pose a serious threat to the insulation of the equipment and the safe operation of the power grid. Modern power transmission and distribution lines basically have two types: overhead power lines and power cable lines. Restricted by the location of the ground, it is not allowed to erect towers and overhead lines; and in some severely polluted areas or national defense military projects to...

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of the power system, there are more and more power transmission and distribution methods using power cables. The increase in power cable lines leads to a sharp increase in the capacitive current of the system. When grounding, the arc cannot be extinguished due to excessive capacitive current, and the overvoltage caused by intermittent arc grounding will pose a serious threat to the insulation of the equipment and the safe operation of the power grid.

Modern power transmission and distribution lines basically have two types: overhead power lines and power cable lines. Restricted by the location of the ground, it is not allowed to erect towers and overhead lines; and in some severely polluted areas or national defense military projects to avoid exposure and other areas, it is necessary to use the power transmission and distribution method of power cable lines. Take the 10KV system as an example, 1km The capacitive current of the power cable line is about 30 times that of the overhead power line. A large number of power cables will inevitably cause a sharp increase in the capacitive current of the system. The 6-66KV power grid in my country uses a neutral point ungrounded system. When there is one-way grounding No tripping is allowed in the event of a fault, and the system can continue to run for 2 hours. Excessive capacitive current makes the arc caused by the grounding short circuit unable to be extinguished, and the overvoltage caused by the intermittent arc grounding poses a serious threat to the insulation of the equipment and the safe operation of the power grid.

Images