Method for selecting vibration sensitive area of power transformer tank surface winding

Abstract

The invention provides a method for selecting a vibration sensitive area of a power transformer tank surface winding, which comprises the following steps: (1) distributing measurement points, and acquiring load current signals and vibration signals synchronously; (2) calculating the vibration average energy, main component proportion and correlation coefficients of the vibration measurement points; and (3) determining the weighting coefficient, calculating vibration comprehensive assessment indexes to select the vibration measurement points. The method for selecting the vibration sensitive area of the winding utilizes the vibration performance of the transformer winding, takes the correlation of the100 hertz component amplitude of the vibration signal and the effective value of load current, the vibration energy attenuation and the main component ratio of the vibration signal into consideration, thereby ensuring that the selected sensitive area has low vibration signal attenuation and high proportion of the 100 hertz component, and also ensuring the high correlation of the100 hertz component amplitude of the vibration signal and the load current. The vibration of the finally selected area can reflect the transformer winding vibration characteristic and the winding state characteristic.

Description

technical field [0001] The invention belongs to the technical field of vibration analysis of power equipment, and in particular relates to a method for selecting a sensitive area for vibration of a surface winding of a power transformer oil tank. Background technique [0002] The power transformer is an important equipment in the power system, and its normal operation is the premise to ensure the safe and reliable operation of the power system. The vibration analysis method has good sensitivity and effectiveness in detecting mechanical structural defects that may cause major transformer accidents. It is a novel online condition monitoring and fault diagnosis method for power transformers, and has good application and development prospects. [0003] Relevant statistical data show that power transformer winding is one of the components with the most faults, so it is of great practical significance to study its monitoring and diagnosis methods. Due to changes in mechanical str...

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Problems solved by technology

[0008] The above-mentioned literature only studies the vibration signal on the winding, and does not carry out specific and in-depth analysis on the vibration signal on the surface of the fuel tank and the structure of the fuel tank. The measuring points are arranged on the surface of the fuel tank corresponding to the space, but due to the inconsistency of the structure of the fuel tank body and the complexity of vibration propagation, the vibration measuring points on the surface of the fuel tank cannot well reflect the vibration on the corresponding winding, so it cannot be given An objective and effective index to evaluate the sensitivity of the test location to winding vibration, which is difficult to apply to actual field tests

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