A Method for Detecting Loose Winding of Hanger Type Transformer
A transformer winding and winding loosening technology, which is applied in the direction of measuring electrical variables, instruments, measuring electricity, etc., can solve the problems of lack of quantitative standards, inability to judge the single torsional deformation of windings, and limited accuracy, so as to reduce costs and realize detection without hood Effect
Active Publication Date: 2017-11-07
JIANGSU ELECTRIC POWER CO +2
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Problems solved by technology
The diagnostic accuracy of the short-circuit impedance method is based on a large number of empirical parameters, which requires a lot of analysis and verification work, which seriously affects the work efficiency
The frequency response method is still in the stage of experience accumulation for the judgment of winding deformation. It lacks certain quantitative standards and has certain limitations. For example, it cannot judge the single torsional deformation of the winding.
The above three methods are all off-line monitoring, the diagnosis is not timely, the accuracy is limited and the cost is high
Method used
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[0040] In this embodiment, a method for detecting the looseness of the hanging-shade transformer winding is as follows: figure 1 As shown, perform the following steps:
[0041] 1) Switch on the hanger type transformer installed with at least 3 vibration sensors, such as figure 2 shown, and start the vibration sensor and the clamp-type current transformer used to measure the B-phase high-voltage winding current of the drop-shroud transformer;
[0042] 2) Collect the vibration signal of the vibration sensor and the B-phase high-voltage winding current;
[0043] 3) from the transient vibration signal extracted from the vibration signal, the transient vibration signal is subjected to Hitbert-Huang transformation to obtain the first eigenvalue and the second eigenvalue;
[0044] The first eigenvalue is the time of the transient vibration signal, and the second eigenvalue is the average value of the instantaneous amplitude of the sixth-order IMF component of the transient vibrati...
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The invention relates to a method for detecting loose windings of a hanger type transformer, belonging to the technical field of power transformer safety monitoring. The method performs the following steps: 1) Switch on the pendant transformer installed with the vibration sensor, and start the vibration sensor and the current transformer; 2) Collect the vibration signal and the high-voltage winding current; 3) Obtain the first eigenvalue, the second The second eigenvalue and the third eigenvalue; 4) Diagnose the looseness of the hanger transformer, and confirm the loose state of the winding. The present invention judges the winding looseness of the transformer when the switch is closed. Compared with the existing off-line detection, the method for detecting winding looseness in the present invention is more timely, which avoids the transformer still running when the winding is loose and damages the transformer. The situation arises.
Description
technical field [0001] The invention relates to a method for detecting loose windings of a transformer, belonging to the technical field of power transformer safety monitoring. Background technique [0002] As the key equipment of power transmission, the reliability and stability of power transformer greatly affect the safe operation of the entire power grid. According to relevant data, more than 50% of transformer failures come from external short circuits, and the huge electromagnetic force generated by external short circuits will further cause major defects such as loosening and deformation of transformer windings. Once the transformer winding fails, it will cause a large-scale power outage, which will bring great economic losses and affect people's normal life. Therefore, it is of great significance to carry out the research on the diagnosis of winding looseness and find the characteristics of winding faults as soon as possible, which is of great significance to elimin...
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IPC IPC(8): G01M13/00G01R31/00
Inventor 陈冰冰许洪华马宏忠施恂山李勇刘宝稳
Owner JIANGSU ELECTRIC POWER CO