A Method for Evaluating Transformer Insulation Aging State Based on Vibration Method
A technology for insulation aging and state evaluation, applied in the electric power field, can solve problems such as transformer decommissioning, unsatisfactory non-stop maintenance, power grid impact, etc., and achieve the effect of broad application prospects
Active Publication Date: 2019-06-11
XI AN JIAOTONG UNIV
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At the same time, when these methods are applied, the transformer needs to be withdrawn, which will have a certain impact on the power grid, which does not meet the current requirements for non-stop maintenance.
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[0025] The present invention is described in further detail below in conjunction with accompanying drawing:
[0026] refer to figure 1 , the transformer insulation aging state assessment method based on the vibration method of the present invention comprises the following steps:
[0027] 1) Install the vibration acceleration sensor on the surface of the transformer oil tank, and use the vibration acceleration sensor to detect the vibration signal of the oil tank body of the transformer under different working conditions;
[0028] 2) Separating the vibration signals of the transformer under different working conditions from the vibration signals of the transformer obtained in step 1), and obtaining the winding vibration signal M of the transformer 1 and core vibration signal M 2 ;
[0029] The specific operation of step 2) is: perform wavelet packet decomposition on the vibration signals of the transformer fuel tank body obtained in step 1) under different working conditions...
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The invention discloses a transformer insulation aging state evaluation method based on a vibration method, and the method comprises the following steps: 1), enabling a vibration acceleration sensor to be installed on the surface of a transformer oil tank, and detecting vibration signals of an oil tank body of a transformer under different conditions through the vibration acceleration sensor; 2), carrying out the signal separation of the vibration signals of the oil tank body of the transformer under different conditions, and obtaining a winding vibration signal M1 and an iron core vibration signal M2 of the transformer; 3), calculating a winding vibration spectrum and the vibration amplitudes Ai of a winding at the frequency of 100Hz and a harmonic frequency according to the winding vibration signal M1 of the transformer; 4), calculating the vibration harmonic distortion rate THD of the winding according to the vibration amplitudes Ai of the winding at the frequency of 100Hz and the harmonic frequency; 5), calculating the insulation aging service life T of the transformer according to the vibration harmonic distortion rate THD of the winding, and judging the insulation aging state of the transformer according to the insulation aging service life T of the transformer.
Description
technical field [0001] The invention belongs to the technical field of electric power, and relates to a method for evaluating the insulation aging state of a transformer based on a vibration method. Background technique [0002] Transformer is one of the most important equipment in the power system, and its safe and stable operation is directly related to the operation stability of the power system. Therefore, it is of great significance and application value to carry out fault diagnosis technology for transformers. In the statistics of internal fault causes of transformers, the main fault types are divided into mechanical internal faults and electrical faults. Among them, the mechanical fault mainly refers to the deformation, displacement and collapse of the winding, and the electrical fault mainly refers to the discharge in the oil-paper insulation system and the decline of the insulation performance caused by the discharge. [0003] According to relevant statistical dat...
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IPC IPC(8): G01R31/12
CPCG01R31/1209G01R31/1263
Inventor 汲胜昌张凡潘智渊李秀广占草师愉航
Owner XI AN JIAOTONG UNIV