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System and method for diagnosing and preliminarily positioning loosening faults of iron core of power transformer

A power transformer and fault diagnosis technology, applied in the field of smart substations, can solve problems such as increased magnetic flux leakage, increased electromagnetic attraction, and increased core vibration

Active Publication Date: 2012-10-10
JIANGSU ELECTRIC POWER CO +2
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0010] After the iron core is loosened, the magnetic flux leakage between the joints of the silicon steel sheets and the laminates becomes larger, resulting in a larger electromagnetic attraction force and a larger vibration of the iron core

Method used

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  • System and method for diagnosing and preliminarily positioning loosening faults of iron core of power transformer
  • System and method for diagnosing and preliminarily positioning loosening faults of iron core of power transformer
  • System and method for diagnosing and preliminarily positioning loosening faults of iron core of power transformer

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Effect test

Embodiment

[0054] Carry out iron core loose fault setting to a power transformer, verify the correctness of the present invention, and carry out experiment according to above-mentioned steps. The transformer is produced by Jiangsu Hongyuan Electric Co., Ltd., and its parameters are shown in Table 1.

[0055] Table 1

[0056] model voltage ratio linkage group S9-M-100 / 10 10 / 0.4kV Yyn0 High side I N Low side I N Short circuit impedance 5.77A 144.3A 3.98%

[0057] (1) System connection

[0058] Cooperate image 3 , the transformer model is S9-M-100 / 10, the vibration sensor adopts CA-YD-103 vibration acceleration sensor, the conversion interface adopts BNC electrical conversion interface, the data acquisition instrument adopts model Nicolet7700, and the analysis module directly adopts a computer. The input end of the vibration sensor is firmly attached to the three positions on the top surface of the transformer oil tank through a magnet, and it...

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Abstract

The invention discloses a system and a method for diagnosing and preliminarily positioning loosening faults of an iron core of a power transformer, and belongs to the technical field of intelligent diagnosis of faults of power transformers. The system for diagnosing and preliminarily positioning faults comprises vibration sensors, a signal acquisition instrument and a computer system. The method for diagnosing and preliminarily positioning faults includes that vibration signals are measured by the three vibration sensors mounted on the top of the transformer, Fourier analysis is carried out for the signals to obtain characteristic quantities, which include a 50Hz component, a 150Hz component and a 300Hz component, of the loosening faults of the iron core, the 300Hz component is used as a main characteristic quantity, a certain position of the iron core is determined to be loosened when amplitudes of the components of the certain position are increased to certain values, and the faults can be positioned by means of comparing the differences of the three characteristic quantities of signals of each position. By the aid of the system and the method, characteristics of the loosening faults of the iron core can be accurately reflected, and the loosening faults of the iron core of the power transformer can be effectively detected.

Description

technical field [0001] The invention relates to an on-line monitoring technology for the status of power transmission and transformation equipment, in particular to a system and method for diagnosing loose iron core faults of power transformers and preliminary fault positioning, and belongs to the technical field of intelligent substations. Background technique [0002] The main reasons for the vibration of the transformer body are the vibration of the transformer body and the vibration of the cooling system device. The basic vibration frequency caused by the cooling device is low, which is obviously different from the vibration of the transformer body; the vibration of the body includes the vibration of the iron core and winding. After the transformer is energized and running, current flows through the winding, which generates an electromagnetic field in the iron core and winding; the silicon steel sheet material of the iron core undergoes magnetostriction under the action ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01H17/00G01R23/16
CPCG01H17/00G01H1/00G01R31/62
Inventor 陈楷王春宁马宏忠李凯吴益明张赢刘洪涛高鹏陈涛涛
Owner JIANGSU ELECTRIC POWER CO
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