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Method for detecting pressing force variation of winding of power transformer based on recursive quantitative analysis

A technology for transformer winding and quantitative analysis, applied in instruments, measuring devices, measuring ultrasonic/sonic/infrasonic waves, etc., can solve problems such as inability to receive, and achieve the effects of less equipment, high detection sensitivity, and simple operation

Inactive Publication Date: 2017-11-07
HOHAI UNIV
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  • Claims
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Problems solved by technology

In this case, using traditional linear methods (such as Fourier analysis methods) to measure this change often fails to receive good results due to ignoring some of the factors.

Method used

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  • Method for detecting pressing force variation of winding of power transformer based on recursive quantitative analysis
  • Method for detecting pressing force variation of winding of power transformer based on recursive quantitative analysis
  • Method for detecting pressing force variation of winding of power transformer based on recursive quantitative analysis

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Embodiment 1

[0068] In order to measure the overall compression degree of the transformer winding, this embodiment incorporates synchronously sampled multi-channel vibration signals into the analysis, and establishes an RQA measure for detecting the change trend of the overall compression force of the winding. At the same time, RQA analysis is directly performed on the vibration signal of a single sensor, and a local change trend measurement of the pressing force is established. The invention not only uses less equipment and is easy to operate, but also has accurate diagnosis and can accurately detect the looseness of the winding due to the change of the pressing force.

[0069] Step S7 also includes, according to the position of the monitoring point where the difference of the local RQA metric value exceeds the RQA metric difference threshold, judging the position where the winding of the transformer to be tested is loose. That is, if the local RQA metric values ​​corresponding to a monit...

Embodiment 2

[0091] In this example, the winding compression force is set for a SFZ10-31500 / 110 oil-immersed power transformer of Nanjing Liye Transformer Co., Ltd., the transformer connection group is marked as YNd11, the rated voltage of the low-voltage side is 10.5kV, and the rated current is 1732A .

[0092] Vibration signal acquisition is carried out using a vibration acceleration sensor model JF2020 and a Nicolet data acquisition instrument. Place 3 measuring points on the surface of the transformer box, the positions are as follows figure 2 shown. Considering the frequency range of the transformer vibration signal, the sampling frequency is set to 10kHz during the test.

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Abstract

The invention discloses a method for detecting the pressing force variation of the winding of a power transformer based on recursive quantitative analysis. The method comprises firstly using a short circuit experimental method to acquire a box surface vibration signal of a transformer with normal winding pressing force, and using a recursive quantitative analysis (RQA) method to obtain a reference RQA parameter; then acquiring a box surface vibration signal of a transformer with a winding to be detected by using the short circuit experimental method at the same sampling frequency and sampling time, and obtaining the RQA parameter of the transformer winding with unknown compactness by RQA; comparing the RQA parameter with the reference RQA parameter to determine if the transformer winding pressing force has changed. The method not only establishes the RQA measurement for detecting the variation trend of the overall pressing force of the winding, but also directly performs the RQA analysis on the vibration signal of a single sensor and establishes the local variation trend measurement of the pressing force. The method uses little equipment, simple in operation and accurate in diagnosis, can accurately detect the loosening of the winding due to pressing force changes.

Description

technical field [0001] The invention relates to the technical field of state monitoring and fault diagnosis of voltage transformers, in particular to a method for detecting changes in compression force of power transformer windings based on recursive quantitative analysis. Background technique [0002] The power transformer is one of the most critical equipment in the power system, and it is also the core equipment for the current smart grid construction and the future realization of the energy Internet strategy. Whether it is power generation, transmission or distribution, it depends on the normal and stable operation of the transformer. Transformers are expensive, bulky, and difficult to maintain. Once a fault occurs, maintenance will consume a lot of time, manpower and material resources, and will have a major social impact. Therefore, it is necessary to monitor the transformer in real time. According to statistics, mechanical faults such as loose windings caused by ext...

Claims

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Application Information

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IPC IPC(8): G01H17/00
CPCG01H17/00
Inventor 黄春梅马宏忠吴明明刘宝稳刘勇业魏海增张艳张琳顾苏雯付明星
Owner HOHAI UNIV
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