Single-phase traction transformer for high-speed electrified railway in AT (auto-transformer) power supply way

Abstract

The invention relates to a single-phase traction transformer for a high-speed electrified railway in an AT (auto-transformer) power supply way. The conventional traction transformer for AT power supply consists of a T-transformation single-phase traction transformer and an M-transformation single-phase traction transformer, and the two transformers need to be separately designed, have complicated structures and high manufacturing difficulty and difficultly meet design requirements. The single-phase traction transformer is characterized in that: an iron core is in a single-phase two-column structure; iron core columns are sleeved with five concentric winding layers from the inner side to the outer side; a first winding, a second winding, a third winding and a fourth winding on a power supply side are connected in series to form a power supply side output end; a third winding, a fourth winding, a first winding and a second winding on a feed side are connected in series to form a feed side output end; and a primary side first winding is connected in series with a primary side second winding to form a phase A input end and a phase B input end. In the single-phase traction transformer, the T-transformation single-phase traction transformer and the M-transformation single-phase traction transformer are uniformly designed into the traction transformer, so that the single-phase traction transformer has a simple structure, meets design requirements and lowers design and production cost.

Description

technical field [0001] The present 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...

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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, and the outlet autotransformer 55 / 27.5kV is required for power transformation, and the cost is relatively 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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