Method used for detecting hang cover type transformer winding looseness
A transformer winding and winding loosening technology, applied in the measurement of electrical variables, instruments, measuring electricity and other directions, can solve the problems of lack of quantitative standards, inability to judge the single torsional deformation of windings, limited accuracy, etc., to reduce costs and realize detection without hood Effect
Active Publication Date: 2015-12-09
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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Embodiment
[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) The transient vibration signal extracted from the vibration signal is subjected to Hitbert-Huang transformation on the transient vibration signal 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 vibration ...
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The invention relates to a method used for detecting hang cover type transformer winding looseness, which belongs to the technical field of power transformer safety monitoring. The method comprises the steps that 1) a hang cover type transformer with a vibration sensor is closed, and the vibration sensor and a current transformer are turned on; 2) a vibration signal and high voltage winding current are acquired; 3) a first characteristic value, a second characteristic value and a third characteristic value are acquired; and 4) looseness diagnosis is carried out on the hang cover type transformer to confirm the loose state of a winding. According to the invention, when closing is carried out, looseness judging is carried out on the winding of the transformer; compared with existing off-line detection, the winding looseness detection method provided by the invention is more timely; and the working transformer is prevented from being damaged when the winding is loose.
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 faults 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 eliminat...
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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