﻿ 变压器绕组振动特性研究 Study on Vibration Characteristics of Transformer Windings

Transmission and Distribution Engineering and Technology
Vol.05 No.03(2016), Article ID:18494,7 pages
10.12677/TDET.2016.53003

Study on Vibration Characteristics of Transformer Windings

Wei Liu, Qiufeng Shang, Guozhen Yao

North China Electric Power University, Baoding Hebei

Received: Aug. 20th, 2016; accepted: Sep. 5th, 2016; published: Sep. 8th, 2016

Copyright © 2016 by authors and Hans Publishers Inc.

ABSTRACT

On the basis of theoretical analysis of various factors affecting the vibration of transformer windings, the finite element model simulation analysis of the transformer was built by ANSYS. The effect of different precompression on the natural frequency of winding vibration was verified. The vibration signal of the transformer tank surface was studied by the on-line monitoring system of the transformer vibration. The experimental results showed that the vibration of the transformer windings was concentrated in the fundamental frequency 100 Hz. The amplitude of the fundamental frequency was proportional to the square of load current.

Keywords:Wind, ANSYS, Precompression, FEM

1. 引言

2. 仿真分析

2.1. 振动原理

1) 硅钢片的磁滞伸缩引起的铁心振动；

2) 硅钢片接缝处和叠片之间存在着因漏磁而产生的电磁吸引力，引起的铁心振动；

3) 电流通过绕组时，在绕组间、线饼间、线匝间产生的动态电磁力引起绕组的振动。

2.2. ANSYS有限元模型建立

2.3. 绕组振动与负载电流的关系研究

(1)

(a)(b)

Figure 1. Finite element model of transformer winding (a) high voltage winding (b) low voltage winding

(2)

2.4. 预紧力对固有频率的影响

(3)

(4)

(5)

Figure 2. Relationship between vibration response and current at different frequency

3. 变压器绕组振动特性实验研究

3.1. 振动采集实验系统构成

3.2. 不同功率下绕组振动幅值分析

Table 1. The relationship between mode frequency of high voltage winding and pre-compression

Table 2. The relationship between mode frequency of low voltage winding and pre-compression

Figure 3. Block diagram of vibration signal acquisition system

Figure 4. Vibration acceleration signal of transformer winding

3.3. 绕组基频振动幅值和电流关系分析

(6)

4. 结束语

1) 在油箱表面测得的绕组振动信号主要集中在100 Hz处，200 Hz，300 Hz，400 Hz处也有分布，1000 Hz频率外几乎为零。

2) 绕组预紧力的变化会影响绕组的固有频率，当绕组固有频率和电磁力频率接近时，会引发谐振现象。在这种振动状态下可能会产生比预紧力大得多的动态力，从而造成绕组线圈结构的松散。因此，在变压器的运行中，要严格避免发生谐振现象。

3) 绕组基频振幅和负载电流的平方有良好的线性关系。

Figure 5. Relationship between vibration amplitude of fundamental frequency and current square value

Study on Vibration Characteristics of Transformer Windings[J]. 输配电工程与技术, 2016, 05(03): 17-23. http://dx.doi.org/10.12677/TDET.2016.53003

1. 1. 洪刚. 基于振动法的变压器绕组及铁心状态监测与故障诊断方法研究[D]: [硕士学位论文]. 西安: 西安理工大学, 2010.

2. 2. 徐志. 基于振动法的变压器在线监测研究[D]: [硕士学位论文]. 重庆: 重庆大学, 2010.

3. 3. 洪凯星. 基于振动法的大型电力变压器状态检测和故障诊断研究[D]: [硕士学位论文]. 杭州: 浙江大学, 2010.

4. 4. 虞海强. 基于振动分析法的变压器状态检测研究[D]: [硕士学位论文]. 成都: 西华大学, 2012.

5. 5. 汲胜昌. 变压器绕组与铁心振动特性及其在故障监测中的应用研究[D]: [博士学位论文]. 西安: 西安交通大学, 2003.

6. 6. 曹海泉, 刘珊, 洪刚. 希尔伯特-黄变换在变压器铁心振动信号中的应用[J]. 变压器, 2010, 47(11): 30-33.

7. 7. 乔丽威, 尚秋峰, 李永倩, 姚国珍. 电力变压器绕组和铁芯的模态分析[J]. 电源技术, 2014, 38(12): 2334-2336.

8. 8. 王德勇. 电力变压器振动监测方法研究[J]. 中国高新技术企业, 2007(12): 90.

9. 9. 袁国刚, 谢坡岸, 静波, 韩雪华. 轴向预紧力对变压器绕组振动特性的影响[J]. 噪声与振动控制, 2003(2): 25-27.

10. 10. 乔丽威. 基于振动分析方法的电力变压器故障分析建模[D]: [硕士学位论文]. 河北: 华北电力大学, 2013.