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Strand Short Circuit Fault Detection Method for Stator Transposed Bars

A technology of transposition bar and strand short circuit, which is applied in the field of stator winding detection, can solve the problems of fault expansion, short-circuit strand temperature rise, strand current rise, etc., and achieve the effect of cost reduction, fast and accurate detection

Active Publication Date: 2022-01-14
HARBIN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through the analysis of the characteristics of the strand short-circuit fault, it is found that a severe strand short-circuit fault will cause a substantial increase in the strand current, resulting in a sharp increase in the temperature of the short-circuit strand, which will easily cause the fault to expand
At present, the research on the short-circuit faults of stator windings of large generators mainly focuses on the inter-turn short-circuits, phase-to-phase short-circuits and grounding short-circuit faults of the stator windings. There is still no effective and feasible method for the detection of strand short-circuit faults in the process of stator transposition bar preparation. method

Method used

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  • Strand Short Circuit Fault Detection Method for Stator Transposed Bars
  • Strand Short Circuit Fault Detection Method for Stator Transposed Bars
  • Strand Short Circuit Fault Detection Method for Stator Transposed Bars

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specific Embodiment approach 1

[0034] Specific implementation mode one: refer to Figures 1 to 3 Specifically illustrate this embodiment, the strand short-circuit fault detection method of stator transposition bar described in this embodiment, with 2 stator transposition bar as tested sample, put 2 measured stator transposition bar respectively into the upper and lower slots of the single-slot stator core. Connect the upper and lower electronic transposition rods in parallel. Insulation pads are placed between the lower stator transposition bar and the slot bottom of the stator core, between the upper and lower stator transposition bars, and between the stator transposition bar and the stator teeth. A plurality of measuring points with the same number as the strands are set on the two measured sub-transposition wire rods to ensure that there is one measuring point on each strand. At the same time, a plurality of measuring points are all located on the center line of the middle section of the two ends of t...

specific Embodiment approach 2

[0051] Specific embodiment 2: This embodiment is to further explain the strand short-circuit fault detection method of the stator transposition bar described in the specific embodiment 1. In this embodiment, the faulty strand is further positioned, and the specific method is as follows :

[0052] When the number of mutated strand groups is greater than or equal to 2, and there are adjacent mutated strand groups, the strands that simultaneously exist in two adjacent mutated strand groups are faulty strands.

[0053] Example: There are two mutation strand groups, the two strands in one mutation strand group are strand 1 and strand 2, and the two strands in the other mutation strand group are strand 2 and strand 2. 3 strands. Then it is determined that the No. 2 strand is the faulty strand, so as to realize the positioning of the faulty strand.

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Abstract

The invention discloses a strand short-circuit fault detection method for a stator transposition bar, which relates to the technical field of stator winding detection. The invention aims at detecting the strand short-circuit fault during the preparation process of the large-scale generator stator winding transposition bar. The strand short-circuit fault detection method of the stator transposition bar according to the present invention first performs simulation and end magnetic field detection, and then calculates its magnetic field change rate and deviation, so as to realize whether a strand short-circuit fault occurs in the stator transposition bar Inspection has important guiding significance for evaluating the pros and cons of stator transposition bar manufacturing process. Compared with the traditional stator transposition wire rod detection method, the present invention does not need to make a prototype, is easy to implement and has a flexible test method, and can efficiently, quickly and accurately detect the stator transposition wire rod before the overall assembly of a large motor, reducing unnecessary necessary cost.

Description

technical field [0001] The invention belongs to the technical field of stator winding detection. Background technique [0002] Large-scale motors are one of the important equipment of power system and drive system. Large-scale motors have a large single-unit capacity, and the impact after failure is huge. As the core of large-scale motors, the stator transposition bar directly determines the safety of large-scale motors. Stablize. [0003] The stator transposition bars of large motors often use transposition flat copper wires wrapped with insulating materials to reduce eddy current loss and circulation loss during operation. The insulation of the strands is easily damaged during the preparation of the transposed bar. Through the analysis of the characteristics of the strand short-circuit fault, it is found that the severe strand short-circuit fault will cause a large increase in the strand current, resulting in a sharp increase in the temperature of the short-circuit stran...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/52
CPCG01R31/52
Inventor 王晨光梁艳萍倪磊
Owner HARBIN UNIV OF SCI & TECH