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Fault location method for large generator stator transposition wire rod strand short circuit fault

A technology of generator stator and transposition bar, applied in fault location, short-circuit test, measurement of electricity, etc., can solve the problem of strand short-circuit fault that cannot be effectively located, and achieve the effect of reliable and easy-to-implement maintenance and testing

Active Publication Date: 2021-10-08
HARBIN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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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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  • Fault location method for large generator stator transposition wire rod strand short circuit fault
  • Fault location method for large generator stator transposition wire rod strand short circuit fault
  • Fault location method for large generator stator transposition wire rod strand short circuit fault

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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 method for locating a short-circuit fault of a large-scale generator stator transposition wire rod strand, which relates to the field of motors. The 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. The present invention firstly calculates the magnetic field jump values ​​of normal and faulty wire rods; then numbers the strands; intercepts the radial cross-sectional view of the faulty stator transposition wire rod; marks the faulty strands in each remaining radial cross-sectional view Strands with the same sampling point number in the line sampling point set; when adjacent marked strands appear in a radial section view, the adjacent marked strands are short-circuit faulty strands, and the radial section view The location is the fault location of the short-circuit fault strand. The invention is suitable for fault location of 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 Patents(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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