A method and system for measuring the micro-water content of the oil paper part in the capacitive casing
A micro-water content, capacitance-type technology, which is applied in the direction of measuring devices, material capacitance, and material analysis through electromagnetic means, can solve problems such as inaccurate insulation status of bushings
Active Publication Date: 2020-07-07
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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[0005] This application provides a method and system for measuring the micro-water content of the oil paper part in the capacitance-type bushing, so as to solve the current problem of inaccurate judgment of the insulation state of the bushing based on the micro-water content of the bushing
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[0048] In order to enable those skilled in the art to better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.
[0049] see figure 1 , the embodiment of the present application provides a method for measuring the micro-water content of the oil paper part in the capacitive casing, including:
[0050]Step 101, acquiring the bushing capacitance value and insulation resistance value when the bushing is newly put into operation, and obtaining the bushing capacitance value and insulation resistance value when the bushing is regularly inspected. The bushing when it is newly put into operation generally does not have insulation problems. What this application is to solve is the insulation detection problem of the bushing after a period of operation. Therefore, the state of the bushing during regular inspection ...
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The invention discloses a method and system for measuring micro-water content of an oil paper part in a capacitive type bushing. The method comprises the following steps: firstly, acquiring value of abushing capacitance and value of an insulating resistance when the bushing is put into operation, and acquiring value of the bushing capacitance and value of the insulating resistance when the bushing is subjected to scheduled maintenance; then acquiring a bushing capacitance ratio and an insulating resistance ratio according to the value of the bushing capacitance and the value of the insulatingresistance when the bushing is put into operation and when the bushing is subjected to the scheduled maintenance; then acquiring a wetting function of oil paper of the bushing; finally determining the micro-water content of the bushing according to the wetting function, the bushing capacitance ratio and the insulating resistance ratio. According to the method disclosed by the invention, a disassembling method is not adopted and a condition that micro-water exceeds the standards, caused by secondary pollution in a disassembling process, can be eliminated, so that a method for judging the insulating state of the bushing according to the micro-water content of the bushing is more accurate.
Description
technical field [0001] The present application relates to the technical field of analysis and measurement control, and in particular to a method and system for measuring the micro-water content of the oil-paper part in a capacitive casing. Background technique [0002] The capacitive bushing is a composite insulating material bushing with oil paper and gummed paper as the main insulation, and a capacitor equalizing plate to evenly distribute the radial and axial electric fields. [0003] According to statistics, the main causes of capacitive bushing failure are insulation damp, manufacturing process defects, oil leakage, and insulation aging. The faults are almost negligible compared with the main insulation fault types, and the accidents caused by the damp insulation are in the forefront. Although the failure and abnormality of the bushing caused by insulation damp does not necessarily constitute an accident, if the abnormal situation cannot be dealt with in time, it will ...
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IPC IPC(8): G01N27/22
CPCG01N27/223
Inventor 彭庆军钱国超刘光祺邹德旭马仪颜冰徐肖伟周兴梅李建杰
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST