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Large generator stator transposition bar strand short circuit fault positioning method

A technology of generator stator and transposition bar, which is applied in the direction of fault location, short-circuit test, and electrical measurement. It can solve the problem that the short-circuit fault of strands cannot be effectively located, and achieve reliable and easy-to-implement results in maintenance and testing.

Active Publication Date: 2021-07-09
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention aims to solve the problem that the strand short-circuit fault inside the stator transposition bar cannot be effectively located in the existing large-scale generator diagnosis technology, and now provides a large-scale generator stator transposition bar strand short-circuit fault location method

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  • Large generator stator transposition bar strand short circuit fault positioning method
  • Large generator stator transposition bar strand short circuit fault positioning method
  • Large generator stator transposition bar strand short circuit fault positioning method

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specific Embodiment approach 1

[0038] Specific implementation mode one: refer to Figures 1 to 3 This embodiment will be described in detail. In the method for locating the short-circuit fault of the large-scale generator stator transposition bar strands described in this embodiment, firstly, sampling points are respectively set on the normal and faulty stator transposition bars. Specifically, the end of the stator transposition bar is the part located outside the stator core slot, such as figure 1 As shown, this part has two inflection points, and the straight line between the two inflection points is the middle section at the end of the transposition bar. A line is drawn on the outer surface of the middle section along the midline of the middle section, and the line forms a closed coil. Evenly set multiple sampling points with different numbers on the closed coil, and ensure that there is at least one sampling point on the surface of each strand. The positions of the sampling points on the normal and faul...

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Abstract

The invention discloses a large generator stator transposition bar strand short circuit fault positioning method, and relates to the field of motors. The objective of the invention is to solve the problem that the short circuit fault of the strand in the stator transposition bar cannot be effectively positioned in the existing large generator diagnosis technology. The method comprises the following steps: firstly, calculating magnetic field jump values of normal and fault bars; then numbering the strand yarns; intercepting a radial cross-sectional view of the faulted stator transposed bar; marking the strands with the same sampling point number in the fault strand sampling point set in each of the remaining radial cross-section diagrams; and when adjacent marked strands appear in one radial cross-sectional view, the adjacent marked strands are short-circuit fault strands, and the position of the radial cross-sectional view is the fault position of the short circuit fault strands. The method is suitable for carrying out fault positioning on the stator transposition bar of the motor.

Description

technical field [0001] The invention belongs to the field of motors, and in particular relates to a technology for fault location of motor stator transposition wire rod strands. Background technique [0002] Large generators are one of the most important energy equipment in the power system, and their safety and stability are an important guarantee for the normal operation of the system. The stator winding is the core of a large generator, and its operating characteristics directly determine the operating life of a large generator. As the smallest unit of the stator winding, the quality of the stator transposition bar is the premise to ensure the normal operation of the stator winding. With the in-depth research on the transposition technology, the transposition methods of the stator bar are becoming more and more diverse, and the strands of the stator transposition bar often need to be twisted many times in the groove to realize the transposition. Therefore, during the pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/52G01R31/08
CPCG01R31/088G01R31/52
Inventor 王晨光梁艳萍倪磊边旭汪冬梅高莲莲
Owner HARBIN UNIV OF SCI & TECH
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