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Detection method and device for cumulative effect of power transformer winding deformation

A power transformer and cumulative effect technology, applied in the field of transformers, can solve the problems of long evaluation time and low evaluation efficiency, and achieve the effect of improving efficiency and shortening evaluation time

Active Publication Date: 2020-12-08
STATE GRID HEBEI ELECTRIC POWER RES INST +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, an embodiment of the present invention provides a method and device for detecting the cumulative effect of winding deformation of a power transformer, so as to solve the problem of detecting the cumulative effect of the winding deformation of a power transformer by using methods such as short-circuit impedance method and frequency response method in the prior art. The problem of low evaluation efficiency and long evaluation time is caused, and the cumulative effect of online detection of power transformer winding deformation can be realized

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  • Detection method and device for cumulative effect of power transformer winding deformation
  • Detection method and device for cumulative effect of power transformer winding deformation
  • Detection method and device for cumulative effect of power transformer winding deformation

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Embodiment 1

[0028] An embodiment of the present invention provides a detection method for the cumulative effect of power transformer winding deformation, such as figure 1 As shown, the method includes the following steps:

[0029] Step 101, collecting vibration signals on the surface of the box when the power transformer is in motion.

[0030] A vibration acceleration sensor is arranged on the box body of the power transformer so as to obtain vibration signals on the box body of the power transformer during operation.

[0031] Select the range of the applicable vibration acceleration sensor according to the voltage level of the power transformer, specifically: when the voltage level of the power transformer is less than or equal to 110KV, select the range of less than or equal to 300m / s 2 Acceleration sensor; when the voltage level of the power transformer is greater than 110KV and less than or equal to 330kV, the selected range is less than or equal to greater than 300m / s 2 Less than o...

Embodiment 2

[0068] An embodiment of the present invention provides a detection method for the cumulative effect of power transformer winding deformation, such as image 3 shown, including the following steps:

[0069] Step 301, collecting vibration signals on the surface of the box when the power transformer is in motion.

[0070] A vibration acceleration sensor is arranged on the box body of the power transformer so as to obtain vibration signals on the box body of the power transformer during operation.

[0071] Select the range of the applicable vibration acceleration sensor according to the voltage level of the power transformer, specifically: when the voltage level of the power transformer is less than or equal to 110KV, select the range of less than or equal to 300m / s 2 Acceleration sensor; when the voltage level of the power transformer is greater than 110KV and less than or equal to 330kV, the selected range is less than or equal to greater than 300m / s 2 Less than or equal to 50...

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Abstract

The present invention provides a detection method and a device of a power transformer winding deformation cumulative effect. The method comprises the following steps: acquiring a vibration signal of the surface of a box body when a power transformer is in motion; performing fast fourier transform processing on the vibration signal, and obtaining the center frequency and the center energy of an amplitude frequency curve of the vibration signal; calculating a cumulative effect index of power transformer winding deformation according to the center frequency and the center energy; and detecting the fact that whether the cumulative effect is existed in the power transformer winding deformation according to the cumulative effect index. The method can realize the on-line detection of the cumulative effect of the power transformer winding deformation, improve the efficiency of evaluation greatly and shorten the evaluation time.

Description

technical field [0001] The invention belongs to the technical field of transformers, and in particular relates to a detection method and device for the cumulative effect of deformation of power transformer windings. Background technique [0002] Power transformers are expensive and important pivotal equipment in the power system. Once a fault occurs, it will affect a wide range and may cause major economic losses and even casualties. According to historical statistics, the power transformer faults caused by winding deformation account for the vast majority. The fault of power transformer winding is mainly due to the irreversible change of the mechanical structure of the winding under the action of electromagnetic force or mechanical force. At the same time, the winding deformation caused by the short-circuit surge current often has a cumulative effect. This cumulative effect of winding deformation is very common for long-term operation of power transformers, and will increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 高树国臧谦刘宏亮孙路刘振赵军孟令明
Owner STATE GRID HEBEI ELECTRIC POWER RES INST