Bicontinuous inner-shielding network-side winding structure for series transformer of unified power flower controller (UPFC) engineering

Abstract

The invention relates to a bicontinuous inner-shielding network-side winding structure for a series transformer of unified power flower controller (UPFC) engineering, and belongs to the technical field of transformers. According to the technical scheme, a bicontinuous inner-shielding winding structure is employed, the bicontinuous inner-shielding network-side winding structure is formed by windinga plurality of parallel winding working wires (2) and winding shielding lines (3), the working wires are arranged in parallel in an axial direction in a paired way, axial parallel wires are separatedby oil duct cushion blocks and are not changed at positions, two or more than two working wires are connected in parallel in an amplitude direction, amplitude parallel working wires are crossed and changed at positions, the shielding lines are arranged among the amplitude parallel working wires and among winding turns, and the numbers of the shielding lines are same as the numbers of the workingwires. By the bicontinuous inner-shielding network-side winding structure, the technical problems of high gradient among network-side winding segments, high oscillation voltage of the network-side winding, high transformer overvoltage of the network-side winding to a valve-side winding and high potential difference between the network-side winding and the valve-side winding when waves enter both of an initial end and a tail end of the network-side winding in lightning impact experiment of the series transformer of the UPFC engineering are solved.

Description

technical field [0001] The invention relates to a double-continuous inner-shielded network-side winding structure of a UPFC engineering series transformer, belonging to the technical field of transformers. Background technique [0002] With the continuous improvement of the demand for fast and precise control of power transmission, flexible AC transmission technology is becoming more and more practical, and the unified power flow controller (UPFC) is currently the most representative and most versatile system control component. The UPFC project series transformer is a transformer device with very high technical content that is directly connected to the high-voltage power grid in the entire UPFC. The service conditions of UPFC engineering series transformers are quite different from those of ordinary power transformers. The salient features and conditions of use of UPFC engineering series transformers are: [0003] 1) The series transformer is composed of grid side winding,...

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Problems solved by technology

[0004] 2) The grid-side winding is directly connected in series with the line, and there is no grounding point

However, when the spiral winding structure enters the wave at the head and end of the grid side winding at the same time, the gradient between the grid side winding segments, the oscillation voltage of the grid side winding itself, the transfer overvoltage of the grid side winding to the valve side winding, and the potential between the grid side winding and the valve side winding The difference is very high, which brings great difficulties to the insulation structure design of the transformer.

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