Frequency Response Function of Short Circuit Vibration for Power Transformer

doi:10.7652/xjtuxb201702016

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Frequency Response Function of Short Circuit Vibration for Power Transformer

更新时间：2025-07-09

- Frequency Response Function of Short Circuit Vibration for Power Transformer
- Vol. 51, Issue 2, Pages: 97-103+154(2017)
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201702016
  CLC： TM835.4
- Online First：10 February 2017，
  
  Published：2017
- 稿件说明：
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Frequency Response Function of Short Circuit Vibration for Power Transformer[J]. 2017, 51(2): 97-103+154.
DOI：

Frequency Response Function of Short Circuit Vibration for Power Transformer[J]. 2017, 51(2): 97-103+154. DOI： 10.7652/xjtuxb201702016.

摘要

针对离线测试方法无法对遭受短路冲击后的绕组状态进行在线评估和诊断的问题

提出了一种利用冲击电流下绕组振动的频响函数来表征绕组机械状态的方法。该方法利用振动信号和冲击电流构建了单输入多输出的振动系统

通过自功率谱密度函数获得短路冲击下变压器绕组振动的频响函数

并利用相关系数对多次短路冲击下绕组振动频响函数的相关性进行分析。对一台220 kV变压器短路冲击试验的研究结果表明

在多次短路冲击中

不同频响函数间的相关系数与相电抗的偏差之间存在一定的负相关关系

即相关系数随相电抗的偏差增大而降低

相电抗偏差越大

相关系数越低。该方法可以利用短路故障时的录波信息

通过绕组的振动频响函数和两次短路冲击的相关系数来表征变压器绕组的机械状态。

Abstract

Offline method cannot make online diagnosis and assessment of transformer winding's mechanical condition once short-circuit occurs. A new method for characterizing the mechanical features is proposed via acquiring the frequency response function(FRF)of winding vibration under short-circuit impulse. The vibration signal from transformer oil tank and the short-circuit current from recorder are synthesized to establish a single-input and multiple-output vibration system

and the FRF of winding vibration is acquired in terms of the auto-power spectral density function. The correlation analysis determines the correlation coefficient(CC)of FRF under multiple short-circuit impulse. The short-circuit test for a 220 kV power transformer indicates that under multiple short-circuit impulse

the CC of FRF and the deviation of phase reactance obey the negative correlation

namely

the CC decreases with the increasing phase reactance deviation

and the larger the deviation of phase reactance

the smaller the CC. Compared with the traditional offline methods

this method takes advantages of the recorder information in the accident

and employs the FRF of winding vibration as well as CC between two short-circuit impulses to characterize the mechanical features of transformer winding.

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references

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