T and Pi hybrid grid wiring structure for high voltage power distribution

Abstract

The invention provides a T and Pi hybrid grid wiring structure for high voltage power distribution. The T and Pi hybrid grid wiring structure for high voltage power distribution is used for wire-transformer wiring between a first high-voltage substation and a second high-voltage substation and a first low-voltage substation, a second low-voltage substation and a third low-voltage substation, and each low-voltage substation is provided with three transformers. The first transformer of the first lower-voltage substation is connected with a first bus of the first high-voltage substation, the second transformer of the first lower-voltage substation is connected with a second bus of the first high-voltage substation, and the third transformer of the first lower-voltage substation is connected with a third bus of the first high-voltage substation. The first transformer of the second low-voltage substation is connected with the second bus of the first high-voltage substation, the second transformer of the second low-voltage substation is connected with the third bus of the first high-voltage transformer, and the third transformer of the second low-voltage substation is connected with a second bus of the second high-voltage substation. The first transformer of the third low-voltage substation is connected with the third bus of the first high-voltage substation, the second transformer of the third low-voltage substation is connected with the second bus of the second high-voltage substation, and the third transformer of the third low-voltage substation is connected with a first bus of the second high-voltage substation. The T and Pi hybrid grid wiring structure for high voltage power distribution has the advantages of being simple in structure, economical, practical, favorable for grid operation and maintenance and the like.

Description

technical field [0001] The invention relates to a line-transformer wiring structure for high-voltage power distribution. Background technique [0002] At present, the grid connection mode of the high-voltage distribution network is mainly double-circuit chain and three-T connection. The double-circuit chain mostly uses inner bridge connection, which is conducive to load reverse supply and is suitable for central areas of important cities such as provincial capitals. However, the 110kV side of the substation needs to use two-input-two-outlet or three-input-three-outlet wiring with a busbar. The wiring is the most complicated, the number of switches is the largest, and the component failure rate is high; the T-shaped structure wiring is relatively simple and requires less investment. , the impact range of the fault is large; therefore, from the perspective of not losing the load after the fault, the reliability of the double-circuit chain connection is relatively high, and fro...

AI Technical Summary

Problems solved by technology

[0002] At present, the grid connection mode of the high-voltage distribution network is mainly double-circuit chain and three-T connection. The double-circuit chain mostly uses inner bridge connection, which is conducive to load reverse supply and is suitable for central areas of important cities such as provincial capitals. However, the 110kV side of the substation needs to use two-input-two-outlet or three-input-three-outlet wiring with a busbar. The wiring is the most complicated, the number of switches is the largest, and the component failure rate is high; the T-shaped structure wiring is relatively simple and requires less investment. , the impact range of the fault is large; therefore, from the perspective of not losing the load after the fault, the reliability of the double-circuit chain connection is relatively high, and from the perspective of component failure rate, the reliability of the three-T connection is relatively high, and the current urban high-voltage distribution network cannot be very reliable. To realize the smooth transition of the wiring mode well, facing the problem of rebuilding and demolition

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