Series-parallel tapping method and device for reducing vacancy rate of tapping turns of distribution transformer

Abstract

The invention discloses a series-parallel tapping method and device for reducing the vacancy rate of tapping turns of a distribution transformer, and belongs to the field of transformers. According to the series-parallel tapping method, a first tapping winding and a second tapping winding are connected through a series-parallel tapping switch or a short-circuit piece capable of changing the number of operation turns of a high-voltage winding, and idle tapping turns are connected in parallel to participate in operation in at least one middle tapping gear state. The operation loss of the distribution transformer at a middle gear (especially a rated gear) is reduced, the copper consumption of the coil winding can be reduced under the condition that the loss index of the rated gear is ensured, the material cost of the distribution transformer is reduced, the filling rate of the transformer winding and the economical efficiency of the transformer are improved, and the economic benefit is increased. The operation loss and the economical efficiency of the distribution transformer can be well considered; moreover, the device can be applied to an oil-immersed transformer by adopting a series-parallel tapping switch, and also can be applied to a dry-type transformer by adopting a short-circuit piece, so that the application range is wide.

Description

technical field [0001] The present invention relates to a distribution transformer tapping method and device, and more particularly, to a series-parallel tapping method and device for reducing the idle rate of distribution transformer tapping turns. Background technique [0002] The distribution transformer high-voltage winding tap is used to adjust the output voltage to meet the difference of the grid line voltage. It changes the turns ratio of the primary side and the secondary side by changing the number of operating turns on one side, and finally changes the output voltage of the secondary side. . [0003] There are generally three gears and five gears for the tapping gears of the existing distribution transformers. figure 1 As shown in the figure (only one phase winding is shown in the figure), the tap position of the five-speed voltage regulating distribution transformer is as follows figure 2 (only one of the phase windings is shown in the figure). by figure 2 T...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of existing distribution transformers such as the low utilization rate of tap turns and the difficulty in realizing multi-level tap turns in series and parallel, and to provide a series-parallel split switch that reduces the idle rate of tap turns in distribution transformers. The connection method and device, adopting the technical scheme of the present invention, for the high-voltage winding connection of the multi-level voltage regulating distribution transformer, the parallel operation of the idle tap turns of the distribution transformer is realized by using the series-parallel tap changer or the shorting piece, which reduces the The operating loss of the distribution transformer in the middle gear (especially the rated gear), and in the case of ensuring the loss index of the rated gear, can reduce the amount of copper used in the winding, reduce the material cost of the distribution transformer, and improve the filling rate of the transformer winding and The economy of the transformer makes the operating loss and economy of the distribution transformer well balanced, and can be used in oil-immersed distribution transformers and dry-type distribution transformers

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