On-line monitoring method for fastener looseness based on transformer vibration characteristics

A technology of fasteners and transformers, which is applied in the testing of machine/structural components, testing of mechanical components, and measurement of torque/torsional force during tightening. It can solve problems such as large numerical values ​​and large excitation inrush currents, and achieve accurate measurement results. Effect

Active Publication Date: 2021-06-18
JIANGSU ELECTRIC POWER CO
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AI Technical Summary

Problems solved by technology

When the transformer is switched on with no load, it will generate a large excitation inrush current. In extremely severe cases, the transient value of the excitation inrush current can reach hundreds of times the steady state no-load current. Although the existence time is very short, but The value is very large

Method used

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  • On-line monitoring method for fastener looseness based on transformer vibration characteristics
  • On-line monitoring method for fastener looseness based on transformer vibration characteristics
  • On-line monitoring method for fastener looseness based on transformer vibration characteristics

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Embodiment Construction

[0058] The application will be further described below in conjunction with the accompanying drawings. The following examples are only used to illustrate the technical solutions of the present invention more clearly, but not to limit the protection scope of the present application.

[0059] The vibration on the surface of the transformer mainly comes from the vibration of the iron core and winding. When the power transformer is running stably, the magnetostriction of the silicon steel sheet causes the iron core to vibrate, and the electromotive force generated between the windings, the wire cakes, and the wire turns when the current passes through the windings causes the windings to vibrate. When the transformer is running, its loading voltage, load current and oil temperature will affect the vibration signal on the surface of the transformer oil tank, which will bring errors to the acquisition of vibration signals and affect the results of fault diagnosis. Therefore, it is pa...

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Abstract

The invention relates to an on-line monitoring method for fastener looseness based on transformer vibration characteristics. The method comprises the steps of 1, acquiring vibration signals of a winding fastener under different pre-tightening forces when a three-phase transformer is in no-load closing in an experimental state; 2, performing time-frequency analysis and energy spectrum analysis on the vibration signals acquired in the step 1 by using a wavelet packet energy spectrum to obtain standard characteristic vectors of vibration of the three-phase transformer winding fastener under different pre-tightening forces; 3, collecting a vibration signal of the three-phase transformer winding fastener in an operation state; 4, preprocessing the vibration signal collected in the step 3, and obtaining a vibration characteristic vector of vibration of the three-phase transformer winding fastener; and 5, comparing the vibration characteristic vector with the standard characteristic vector, obtaining the pre-tightening force of the three-phase transformer winding fastener, and carrying out online monitoring on the looseness of the transformer winding fastener. The method is an on-line diagnosis method, the measurement result is accurate and reliable, and the to-be-detected transformer does not need to quit operation.

Description

technical field [0001] The invention relates to the field of state monitoring and maintenance of electric equipment, and more particularly relates to an online monitoring method for fastener looseness based on transformer vibration characteristics. Background technique [0002] The characteristics of modern power transformers are that the capacity of a single unit is increasing and the voltage level is getting higher and higher, which increases the strength of its internal electric field and magnetic field, resulting in electrical, Performance issues such as heat resistance and mechanics. In addition, power transformers may also suffer from mechanical collisions during transportation and installation. Under the influence of the above factors, the core and winding of the power transformer may become loose. Due to the reduction of the clamping force between the iron core and the winding, the short-circuit resistance capability of the power transformer is significantly reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L5/24G01M13/00
CPCG01L5/24G01M13/00
Inventor 陈冰冰李勇张勇马宏忠朱昊许洪华刘宝稳王春宁王立宪顾仲翔
Owner JIANGSU ELECTRIC POWER CO
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