Traction transformer for Scott wiring

Abstract

The invention relates to a traction transformer for Scott wiring. Outlet voltage on the secondary side of the conventional Scott transformer is 55 kV, and a 55 / 27.5 kV of outlet autotransformer needs to be arranged, so that the cost is high, the occupied area is large, the power loss is high, the equipment layout of the traction substation is complicated, and operation and maintenance cost is high. The traction transformer is characterized in that: a first principal post, a second principal post, a third principal post and a fourth principal post are sleeved with three concentric winding layers from the inner side to the outer side, wherein the first winding layer and the second winding layer which are sleeved on the outer sides of the first principal post and the second principal post are divided into power supply side windings and feed side windings respectively; one feed side winding is arranged on the outer layer of one power supply side winding, and another power supply side winding is arranged on the outer layer of one feed side winding; the first winding layer of the third principal post is provided with a power supply side winding, and the second winding layer of the third principal post is provided with a feed side winding; and the first winding layer of the fourth principal post is provided with a feed side winding, and the second winding layer of the fourth principal post is provided with a power supply winding. The 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 our country for AT power supply include the traditional Scott connection traction transformer and VX connection traction transformer. The output voltage of the secondary side of the traditional Scott transformer is 55kV, and the outlet autotransformer 55kV is required for power transformation. / 27.5kV, high equipment and engineering costs; large area, high cost of land acquisition and demolition; large power loss, complex equipment layout of traction substation, high operation and maintenance costs. Although the VX connection traction transformer can reduce the investment, it cannot guarantee the symmetry of the three-phase current on the primary side, which has a great impact on the negative sequence generated by the power system. Contents of the invention [0003] The technical problem to be solved and the t...

AI Technical Summary

Problems solved by technology

[0002] At present, the traction transformers commonly used in our country for AT power supply include the traditional Scott connection traction transformer and VX connection traction transformer. The output voltage of the secondary side of the traditional Scott transformer is 55kV, and the outlet autotransformer 55kV is required for power transformation. / 27.5kV, high equipment and engineering costs; large area, high cost of land acquisition and demolition; large power loss, complex equipment layout of traction substation, high operation and maintenance costs

Although the VX connection traction transformer can reduce the investment, it cannot guarantee the symmetry of the three-phase current on the primary side, and has a great impact on the negative sequence generated by the power system.

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