Inverse Scott transformer with harmonic elimination function

Abstract

The invention discloses an inverse Scott transformer with a harmonic elimination function and relates to the field of transformers. A high-order harmonic of a specific order often causes a problem that traction equipment cannot normally work or even gives a wrong control instruction. The inverse Scott transformer comprises a bracket, an M transformer core, a T transformer core and a harmonic elimination component group, wherein an M transformation network side coil and an M substation side coil are arranged outside the M transformer core; a T transformation network side coil and a T substationside coil are arranged outside the T transformer core; insulated fixing frames are arranged between the M transformer core and the T transformer core; the harmonic elimination component group is arranged on the insulated fixing frames and comprises a T transformer harmonic elimination inductor, an M transformer harmonic elimination inductor, star harmonic elimination capacitors, triangular harmonic elimination capacitors, star harmonic elimination inductors and triangular harmonic elimination inductors; and equal air gaps are kept between the harmonic elimination component group and the M transformer core and the T transformer core at two sides. According to the inverse Scott transformer, the high-order harmonic is eliminated, and the high-order harmonic is prevented from interfering withthe traction equipment, so that normal operation of the equipment is ensured.

Description

technical field [0001] The invention relates to the field of transformers, in particular to an inverse Scott transformer with the function of eliminating harmonics. Background technique [0002] With the advancement of China's high-speed rail technology, locomotives with a speed of more than 300 kilometers per hour have begun to be widely used. The power plant of this locomotive generally adopts the AC-DC-AC power supply mode, that is, the single-phase power supply of the railway grid is supplied to the on-board transformer-rectifier inverter Integrated device-DC-rectification inverter-integrated device-three-phase AC-locomotive The three-phase AC motor drives the locomotive. This process is reversible. The core technology of this reversible process lies in the automatic switching between the rectification state and the inverter state, ensuring The automatic power feeding of the locomotive to the railway grid when the locomotive brakes in the station makes the railway grid h...

AI Technical Summary

Problems solved by technology

[0002] With the advancement of China's high-speed rail technology, locomotives with a speed of more than 300 kilometers per hour have begun to be widely used. The power plant of this locomotive generally adopts the AC-DC-AC power supply mode, that is, the single-phase power supply of the railway grid is supplied to the on-board transformer-rectifier inverter Integrated device-DC-rectification inverter-integrated device-three-phase AC-locomotive The three-phase AC motor drives the locomotive. This process is reversible. The core technology of this reversible process lies in the automatic switching between the rectification state and the inverter state, ensuring The automatic power feeding of the locomotive to the railway grid when the locomotive brakes in the station makes the railway grid have a very high power supply efficiency and energy-saving effect, but the vehicle-mounted transformer in this system itself does not have the effect of intercepting the fundamental wave and high-order harmonics. There is a certain amount of high-order harmonics in the railway grid, which is called electric pollution. In the railway traction station, the reverse Scott transformer is used to convert the two-phase alternating current of the railway network into three-phase Phase-to-phase alternating current provides power for the equipment in the traction station, but since this type of transformer takes power from the railway grid (referred to as the road network), high-order harmonics enter the transformer from the two-phase side of the road network (referred to as the grid side) come, and transmitted to the three-phase side of the transformer, that is, the equipment side of the traction station (abbreviated as the side), and then continue to be transmitted to the equipment of the power supply station. This high-order harmonic often appears as a harmonic of a specific order. It can also be detected with an oscilloscope. Since the equipment of the traction station is directly related to the high-speed rail locomotive and plays a control role on the high-speed rail locomotive, a certain number of high-order harmonics often causes the traction equipment to fail to work normally, and even wrong control instructions occur, with extremely serious consequences.

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