Transformer split-type arcless on-load tap switch

Abstract

The invention discloses a transformer split-type arcless on-load tap switch, which comprises a plurality of singular taps connected with a transformer winding, a plurality of double taps, and a changeover switch moving contact which is connected with an outgoing line terminal and is dragged by a motor under the drive of the changeover switch, and further comprises a first two-way switch and a second two-way switch, and a first tapping selector and a second tapping selector, wherein a plurality of static contacts of the first tapping selector are respectively connected with a singular static tap of the transformer winding; the moving contacts of the first tapping selector are respectively connected with one end of a first straight-through contact and one end of the first two-way switch; a plurality of static contacts of the second tapping selector are respectively connected with the double taps of the transformer winding, and the moving contacts of the second tapping selector are respectively connected with one end of the second two-way switch and one end of a second straight-through contact. The transformer split-type arcless on-load tap switch can realize the arcless changeover of the taps of the transformer winding, is low in cost and reliable in operation.

Description

technical field [0001] The invention relates to the field of transformers, in particular to a transformer split type arcless on-load tap changer. Background technique [0002] In the prior art, due to changes in the primary side voltage (grid voltage), load size and nature of the distribution transformer in operation, the secondary side voltage may have a large change. Distribution transformers in my country cover voltage levels below 35kV. In order to maintain the load voltage within the specified range (±5% UN) and ensure the normal needs of electrical equipment, the distribution transformer must be adjusted. [0003] The basic principle of transformer on-load voltage regulation is to draw several taps from the coil on one side of the transformer (usually the high-voltage side), and switch from one tap to Another tap is used to change the effective number of turns to adjust the voltage. The on-load tap changer is composed of two parts, one part is the transformer body, w...

AI Technical Summary

Problems solved by technology

[0008] The existing problems are: the mechanical tap changer generates arc during the tap switching process, causing contact ablation; when the vacuum tap changer adopts a fixed structure, the off-state vacuum switch is always under voltage, and it needs to be designed according to the system voltage. Due to the slow opening and closing time of the vacuum switch in the type structure, the moving speed of the moving contact needs to be coordinated with it, which is difficult to control

In this scheme, since the thyristor is a semi-controlled device, it is difficult to realize the timing coordination of the thyristor on and off when the moving contact moves.

Images