Mechanism for non-interrupting power of medium-voltage side of main transformer during repair

Abstract

The invention discloses a mechanism for non-interrupting the power of a medium-voltage side of a main transformer during repair. The mechanism comprises a transformer station, wherein the transformer station consists of I# and II# transformers which operate in parallel; 10-kV low-voltage sides of the I# and II# transformers are respectively connected with a reactor DK1 and a reactor DK2 in series and then connected to a 10-kV busbar through a switch and front and rear knives; the I# and II# transformers are 220-kV / 110-kV / 10-kV transformers or 110-kV / 35-kV / 10-kV transformers; a first isolation knife is added between the 10-kV low-voltage side of the I# transformer and the reactor DK1; and a second isolation knife is added between the 10-kV low-voltage side of the II# transformer and the reactor DK2. During the test and repair of the reactors, the main transformer can be no longer powered down, so that a10-kV medium-voltage side of the same main transformer can continuously supply power to a user.

Description

technical field [0001] The invention relates to a substation system, in particular to the substation primary equipment with 220kV / 110kV / 10kV and 110kV / 35kV / 10kV as the main transformer. Background technique [0002] In the power system, there are three-turn transformers such as 220kV / 110kV / 10kV and 110kV / 35kV / 10kV. The 10kV on the low-voltage side is often connected with the limit short-circuit current and the capacitor in the line to absorb the capacitive reactive power of the grid and limit the high voltage. The reactor DK of the subharmonic is connected in series, such as figure 1 Middle I ＃ 、Ⅱ ＃ Main transformer △ side to DK1, DK2. [0003] figure 1 It is the main simulation diagram of the Wulitui Substation of Deyang Electric Power Bureau of Sichuan Electric Power Company. It is a clear introduction to this technical transformation. Only two connected 220kV high-voltage power supply lines and 110kV medium-voltage load lines are drawn respectively. There are many mor...

AI Technical Summary

Problems solved by technology

[0008] 1. In the power system, the power supply will be reduced, which will cause power outages to users, and will suffer economic losses

[0009] 2. Even if the power supply can be transferred to another main transformer without equipment maintenance, it will increase the load of the main transformer and increase the operation, which will definitely affect the safety factor

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