Bushing tap pulse signal injection method-based transformer winding deformation detection device and method

A technology for transformer windings and monitoring devices, applied in electromagnetic measuring devices, electric/magnetic solid deformation measurement, etc., can solve problems such as inability to inject online

Inactive Publication Date: 2016-03-02
王彦波 +1
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Problems solved by technology

[0007] The purpose of the present invention is to overcome the inability of the existing transformer winding deformation detection technology to perform online injection of signals effectively in the online state, and to provide a transformer mechanical fault type detection device based on the pulse signal injection method of the capacitive sensor at the end of the bushing. Detection method

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  • Bushing tap pulse signal injection method-based transformer winding deformation detection device and method

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Embodiment Construction

[0018] see figure 1 , the device uses a signal generator to inject a high-frequency pulse signal into the system, the signal enters the low-voltage winding of the transformer through a protection circuit and a voltage divider, and uses a high-frequency current sensor to measure the response signal at the neutral line. The response signal enters the industrial computer through the signal conditioning unit and the data acquisition card. The main hardware devices used in this system are as follows: pulse signal generator, protection circuit, capacitance sensor, high-speed data acquisition card, industrial computer. Using LabVIEW software to process the collected signal, the frequency response curve of the transformer winding is obtained, so as to judge the winding deformation of the transformer.

[0019] The signal source is the key and core part of the entire frequency response analysis detection system, and its parameters and performance determine the test effect of the monito...

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Abstract

The invention provides key equipment during the power transmission and transformation process of an electrical power system. According to the invention, the key equipment conducts the tasks of voltage transformation, power allocation, power transmission and the like. The reliable operation of the key equipment is directly related to the safe and stable operation of the electrical power system. In order to timely find out the potential accidents of a transformer and improve the working efficiency, a frequency response analysis (FRA) method-based power distribution transformer winding deformation online monitoring system is developed. Meanwhile, the software of the monitoring system is programmed by adopting the LabVIEW. In this way, the online monitoring function of transformer windings is realized. According to the above system, a sensor is arranged at the bushing tap of a transformer and a pulse signal of the transformer is injected via the sensor for parameter measurement. Therefore, frequency response curves that reflect the deformation states of transformer windings can be obtained. Through comparing the frequency response curves, the deformation states of transformer windings can be effectively determined.

Description

technical field [0001] The invention relates to a device and method for detecting fault types of transformer windings, belonging to the technical field of transformer detection. Background technique [0002] As the key equipment in the power transmission and transformation process of the power system, the transformer undertakes tasks such as voltage conversion, power distribution and transmission, and its reliable operation is directly related to the safe and stable operation of the power system. Although the quality of transformers has been continuously improved with the improvement of manufacturing process and quality standards, failures and accidents are always inevitable due to the long-term online operation of transformers. Among all transformer faults, the transformer fault rate caused by winding deformation is the highest. According to statistics, the annual transformer faults of 110kV and above transformers due to winding damage account for 50%-60% of all transformer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B7/16
Inventor 王彦波张欣
Owner 王彦波
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