Split blowout on-load tap changer for transformer

Abstract

The invention discloses a split blowout on-load tap changer for a transformer. The split blowout on-load tap changer comprises a tap selector and a diverter switch; the diverter switch comprises a power circuit, a control circuit and a control power supply; the tap selector realizes selection of the number of winding turns of the transformer, and a moving contact of the tap selector is connected with one fixed contact of the power circuit; each fixed contact of the power circuit is connected with a direct contact and a bilateral switch branch; the bilateral switch branch is formed by connecting two electronic power switches, then parallelly connecting the two connected electronic power switches with a buffer circuit and finally serially connecting the three with a fuse; buffer circuits are parallelly connected among the fixed contacts of the power circuit; the control circuit comprises a communication unit, a trigger unit and a detection unit; on and off of the bilateral switch branch are controlled according to data detected by the detection unit. Blowout switching of the split blowout on-load tap changer is realized, expansion of accidents caused by faults of a bilateral switch is prevented, devices are protected from damages, and the split blowout on-load tap changer is simple in structure and reliable in operation.

Description

technical field [0001] The invention relates to the technical field of voltage regulation of transformers, and more specifically relates to a transformer split-type arcless on-load tap changer. Background technique [0002] In the prior art, for a distribution transformer in operation, due to changes in the primary side voltage, load size and nature, the secondary side voltage may have a large change. my country's distribution transformers cover a voltage level below 35kV. In order to maintain the load voltage within the specified range 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, generally the high-voltage side, and switch from one tap to the other through the on-load tap changer without cutting off the load current. A tap to change the number of effective turns to adjust the volt...

AI Technical Summary

Problems solved by technology

[0008] The problems existing in the existing technology are: the mechanical tap changer generates an 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. When the mobile structure is adopted, due to the slow opening and closing time of the vacuum switch, the moving speed of the moving contact needs to be coordinated with it, which is difficult to control; and the above-mentioned tap changers need transition resistance, which increases the loss

This solution still has an arcing process during the switching process, and cannot realize arc-free on-load tap-changers

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