Analysis of Winding Vibration Characteristics of Power Transformers Based on the Finite-Element Method
"> Figure 1
<p>Dry-type transformer-vibration transmission route.</p> "> Figure 2
<p>(<b>a</b>) Position of vibration-acceleration sensor; (<b>b</b>) field experiment.</p> "> Figure 3
<p>A set of typical mechanical-vibration signals.</p> "> Figure 4
<p>(<b>a</b>) Integral model of transformer; (<b>b</b>) simplified model of transformer.</p> "> Figure 5
<p>(<b>a</b>) Mesh-generation results of geometric model; (<b>b</b>) quality diagram of grid division.</p> "> Figure 6
<p>External-circuit equivalent diagram.</p> "> Figure 7
<p>Transformer low-voltage coil three-phase induction current.</p> "> Figure 8
<p>H–B curve.</p> "> Figure 9
<p>(<b>a</b>) Flux-density distribution of the transformer winding; (<b>b</b>) Flux-density distribution of the transformer iron core.</p> "> Figure 10
<p>(<b>a</b>) Radial-stress distribution diagram of transformer windings; (<b>b</b>) axial-stress distribution diagram of transformer winding.</p> "> Figure 11
<p>(<b>a</b>) Experiment locations of measurement points; (<b>b</b>) Simulation locations of measurement points.</p> "> Figure 12
<p>Comparison of vibration signals at each test point.</p> "> Figure 13
<p>(<b>a</b>) Simulation model of winding loosening; (<b>b</b>) simulation model of winding-insulation failure; (<b>c</b>) simulation model of winding deformation.</p> "> Figure 14
<p>Axial diagram of the total displacement of windings under various working conditions. (<b>a</b>) Normai working; (<b>b</b>) Insulation Shedding; (<b>c</b>) Winding loosing and (<b>d</b>) Winding deformation.</p> "> Figure 15
<p>Amplitude direction diagram of winding force displacement under various conditions. (<b>a</b>) Normal working; (<b>b</b>) Insulation Shedding; (<b>c</b>) Winding loosening and (<b>d</b>) Winding deformation.</p> "> Figure 16
<p>Time-domain diagram of vibration-acceleration signals at measurement point 1 under various working conditions: (<b>a</b>) normal working conditions; (<b>b</b>) insulation shedding; (<b>c</b>) winding loosening; (<b>d</b>) winding deformation.</p> "> Figure 16 Cont.
<p>Time-domain diagram of vibration-acceleration signals at measurement point 1 under various working conditions: (<b>a</b>) normal working conditions; (<b>b</b>) insulation shedding; (<b>c</b>) winding loosening; (<b>d</b>) winding deformation.</p> "> Figure 17
<p>Spectrum diagram of vibration signal at measurement point 1 under different working conditions: (<b>a</b>) normal condition; (<b>b</b>) insulation shedding; (<b>c</b>) winding loosening; (<b>d</b>) winding deformation.</p> ">
Abstract
:1. Introduction
2. Study of the Mechanical Vibration Characteristics of Transformer Windings
2.1. Vibration-Signal Conduction Process and Winding Electrodynamic Analysis of Dry-Type Transformers
2.2. Transformer Short-Circuit Experiment
3. Multiphysical Field-Coupling Model for Winding Vibration of Dry-Type Transformer
3.1. Establishment and Mesh Generation of a Vibration-Simulation Model for a Dry-Type Transformer
3.2. Simulation Model of Electromagnetic Field
3.3. Modeling of Solid Mechanics and Analysis of Winding Vibration
4. Simulation and Analysis of the Mechanical Faults of Transformer Windings
4.1. Simulation Geometric Model of the Mechanical Faults of Transformer Winding
4.2. Analysis of the Simulation Results of Three Typical Faults
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
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Main Technical Indicators | Parameter |
---|---|
Phase number | Three-phase |
Rated frequency | 50 Hz |
Rated capacity | 1000 kVA |
Rated voltage | 10,000/400 V |
Rated current | 57.74/1443.38 |
Connection mode | Dyn11 |
Cooling mode | AN |
Short-circuit impedance (%) | 5.91 |
Coil | Parameter Type | Size (mm) | Coil | Parameter Type | Size (mm) |
---|---|---|---|---|---|
High pressure | Internal diameter | 286 | Low pressure | Internal diameter | 252 |
External diameter | 369 | External diameter | 280 | ||
Height | 405 | Height | 446 | ||
Turn number | 1125 | Turn number | 45 | ||
Type | Layer type | Type | Layer type |
Parameter Type | Parameter | Parameter Type | Size (mm) |
---|---|---|---|
Structure | Three-phase three-column | General length | 990 |
Joint method of side column | Standard oblique connection | Total height | 900 |
Silicon steel sheet material | 35Q165 | Thickness | 196 |
Core column radius (mm) | 90 | Upper- and lower-yoke height | 180 |
Structure | Modulus of Elasticity (Pa) | Density (g/cm3) | Poisson’s Coefficient |
---|---|---|---|
Winding | 1.16 × 1011 | 3.2 | 0.32 |
Iron core | 2 × 1011 | 7.6 | 0.24 |
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Duan, X.; Zhao, T.; Liu, J.; Zhang, L.; Zou, L. Analysis of Winding Vibration Characteristics of Power Transformers Based on the Finite-Element Method. Energies 2018, 11, 2404. https://doi.org/10.3390/en11092404
Duan X, Zhao T, Liu J, Zhang L, Zou L. Analysis of Winding Vibration Characteristics of Power Transformers Based on the Finite-Element Method. Energies. 2018; 11(9):2404. https://doi.org/10.3390/en11092404
Chicago/Turabian StyleDuan, Xiaomu, Tong Zhao, Jinxin Liu, Li Zhang, and Liang Zou. 2018. "Analysis of Winding Vibration Characteristics of Power Transformers Based on the Finite-Element Method" Energies 11, no. 9: 2404. https://doi.org/10.3390/en11092404