An on-load tap changer

Abstract

The invention provides an on-load tapping switch. The on-load tapping switch comprises a switch control loop and bypass loops, wherein the switch control loop consists of an electronic power switch basic assembly and is connected with an outgoing line of a transformer regulating winding; the bypass loops are connected with two ends of the switch control loop in parallel; the electronic power switch basic assembly comprises a path switch pathway which consists of electronic power switches and a crossing switch pathway which consists of electronic power switches; one end of a path switch is connected with the outgoing line of one end of the transformer regulating winding in series and is further connected with one end of a crossing switch in parallel; the other end of the crossing switch is connected with the next group basic assembly in series; a connection line led from the serial connection point is connected with the other end of the regulating winding, so that the on-load tapping switch can bear any high pressure regulation. The on-load tapping switch provided by the invention is simple in control method, can reduce the use quantity of the electronic power switches in the electronic on-load tapping switch, thereby reducing the manufacturing cost.

Description

technical field [0001] The invention relates to the on-load tap changer technology of switching technologies such as transformer on-load voltage adjustment and arc-suppression coil turn adjustment in the power system. Background technique [0002] At present, the voltage adjustment in the operation of the power grid mainly depends on the transformer on-load tap-changer to achieve, and the existing on-load tap-changers are all mechanical. Although the mechanical on-load tap-changer technology tends to be mature, its inherent problems cannot be solved and it is difficult to break through. Inherent problems are: (1) Overvoltage impact on the power grid is inevitable during adjustment; (2) Arcs are easily generated during the switching process, which polarizes the transformer oil and causes frequent maintenance; (3) Cannot be adjusted quickly and frequently; (4) It is not suitable for phase adjustment. [0003] After the advent of high-power power electronic switches (triacs, ...

AI Technical Summary

Problems solved by technology

Using multiple tubes in series to solve the problem of pressure, not only the economic indicators are not good, but also the number of devices is too large, resulting in the use of tubes in series, resulting in technical complexity

[0009] It is the above-mentioned two major problems of technology and economy that plague the researchers, making it difficult for this substitution to break through to the 35KV voltage level

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