Star-shaped, reverse open-triangular and triangular tie line combined traction transformer

Abstract

The invention discloses a star-shaped, reverse open-triangular and triangular tie line combined traction transformer. A secondary coil comprises a first secondary coil and a second secondary coil. The first secondary coil is formed by connecting a first coil a1x1, a second coil b1y1, and a third coil c1z1, to form a reverse open-triangular tie line, that is, a Z-shaped structure. The second secondary coil is formed by connecting a first coil a2x2, a second coil b2y2, and a third coil c2z2, to form a triangular tie line structure. The traction transformer is advantaged by simple structure and convenient installation, and is clever in design, and is safe and reliable. A three-phase power supply system of a power supply network is converted to a single-phase traction power supply system, and three-phase current balanced power supply converts single-phase load to three-phase balanced load, negative-sequence current generated in power supply is thoroughly eliminated, harm on a power grid is reduced to the largest extent, thereby improving power supply quality and safe and stable operation level of the power grid. The traction transformer is advantaged by providing a station power supply and three-phase power of a railway region.

Description

technical field [0001] The invention relates to a star-shaped, reverse-opened triangle and triangle-connected combined traction transformer, which belongs to the technical field of improving traction power supply systems for electrified railway electric locomotives. Background technique [0002] At present, with the full popularization of electrified railways and the large-scale construction of high-speed railways, railways are increasingly dependent on electricity, and electricity has become the main energy source for locomotive traction power. The traction transformer is one of the most important equipment, and it is the core part of the entire electric traction system. At present, the traction transformers for railway traction power supply operation in my country include: single-phase junction transformer, single-phase V.v junction transformer, three-phase YN.d11 double Winding transformer, Scott tie-line transformer, YN. tie-line impedance matching transformer, YN. tie-li...

AI Technical Summary

Problems solved by technology

The traction transformer is one of the most important equipment, and it is the core part of the entire electric traction system. At present, the traction transformers for railway traction power supply operation in my country include: single-phase junction transformer, single-phase V.v junction transformer, three-phase YN.d11 double Winding transformer, Scott tie-line transformer, YN. tie-line impedance matching transformer, YN. tie-line balance transformer, non-impedance matching YN. The power supply is three-phase. At present, the wiring forms of traction transformers in operation in my country include: single-phase wiring, three-phase / two-phase wiring, and three-phase / two-phase balanced wiring. No matter which wiring form can effectively solve the three-phase The problem of phase balance power supply; as a result, the three-phase load current of the grid power supply is extremely unbalanced, and thus a large negative sequence current and harmonics are generated, resulting in increasing damage to the grid voltage quality and power equipment. For a long time It has brought a greater threat to the safe and stable operation of the power supply network; this is also an unsolved technical problem that has plagued the power supply network for electric traction power supply for decades

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