Traction transformer series-connected in one box by two low voltage winding layers for AT (Auto-Transformer) power supply

Abstract

The invention discloses a traction transformer series-connected in one box by two low voltage winding layers for AT (Auto-Transformer) power supply, relating to traction transformers. The ordinary traction transformer for AT power supply comprises a T single phase traction transformer and an M single phase traction transformer, the two transformers are necessarily and independently designed, the structure is complex, the manufacturing difficulty is big, and design requirements are difficultly satisfied. The traction transformer is characterized in that a core limb group comprises four core limbs, and three winding layers are sleeved on the core limbs from inside to outside; the first winding layers of the first core limb and the third core limb are power supply side windings, and the second winding layer is a feed side winding; the first winding layers of the second core limb and the fourth core limb are the feed side windings, and the second winding layer is a power supply side winding; and the power supply side windings on the first core limb and the second core limb and the power supply side windings on the third core limb and the fourth core limb are respectively connected in series. In the invention, because the T single phase traction transformer and the M single phase traction transformer are uniformly designed into the traction transformer, the structure is simple, the design requirement is satisfied, and the design cost and the production cost are reduced.

Description

technical field [0001] The invention relates to a traction transformer. Background technique [0002] At present, the traction transformers commonly used in my country for AT power supply include Scott wiring traction transformer and VX wiring traction transformer. The Scott transformer is composed of two single-phase traction transformers, T transformer and M transformer. T transformer and M transformer need to be designed separately. , the structure of the whole transformer is complex and difficult to manufacture, the outlet voltage of the secondary side is 55kV, the outlet autotransformer 55 / 27.5kV is required for power transformation, and the cost is high; it cannot meet the AT power supply mode VX wiring traction transformer Z 21 = Z 31 , (3Z 21 +Z 31 -Z 23-1 ) / 4<0.3Ω design requirements. where Z 21 is the impedance seen from the supply side winding after the primary winding is short-circuited, Z 31 is the impedance seen from the feed-side winding after the pri...

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Problems solved by technology

[0002] At present, the traction transformers commonly used in my country for AT power supply include Scott wiring traction transformer and VX wiring traction transformer. The Scott transformer is composed of two single-phase traction transformers, T transformer and M transformer. T transformer and M transformer need to be designed separately. , the structure of the whole transformer is complex and difficult to manufacture, the outlet voltage of the secondary side is 55kV, the outlet autotransformer 55 / 27.5kV is required for power transformation, and the cost is high; it cannot meet the AT power supply mode VX wiring traction transformer Z 21 = Z 31 , (3Z 21 +Z 31 -Z 23-1 ) / 4<0.3Ω design requirements

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