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Apparatus and method for detecting partial discharge of power transformer by utilizing fluorescence fiber

A power transformer, partial discharge technology, applied in the direction of testing dielectric strength, can solve the problems of ultra-high frequency electromagnetic signal interference, affecting accuracy, low detection frequency, etc., to achieve strong anti-electromagnetic interference ability, improve accuracy and precision , the effect of high detection sensitivity

Inactive Publication Date: 2012-02-01
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of this method are: (a) due to the serious electromagnetic interference at the operating site, the pulse current method cannot be effectively applied to the online monitoring of operating equipment; (b) for equipment with winding structures such as transformers, due to the partial The complexity of the pulse current method leads to a large error in quantification; (c) when the capacitance of the test product is large, the detection sensitivity of the test instrument is not high due to the influence of the coupling capacitance; (d) the detection frequency is low , narrow frequency band, contains less information
The main disadvantage of this method is that there is no effective method for quantitative calibration, and it is susceptible to interference from external ultra-high frequency electromagnetic signals of the tested equipment, which affects the accuracy of the test.

Method used

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  • Apparatus and method for detecting partial discharge of power transformer by utilizing fluorescence fiber
  • Apparatus and method for detecting partial discharge of power transformer by utilizing fluorescence fiber
  • Apparatus and method for detecting partial discharge of power transformer by utilizing fluorescence fiber

Examples

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Effect test

Embodiment 1

[0052] Such as Figure 1-3 As shown, a device for detecting partial discharge of a power transformer with fluorescent optical fiber mainly includes an induction voltage regulator 1, a non-halo test transformer 2, a non-partial discharge protection resistor 3, a standard capacitor voltage divider 4, a partial discharge generator 8, Photomultiplier tube 9, potentiometer 10, DC stabilized power supply 11, coaxial cable 12, oscilloscope 13, etc. The feature is: the primary side of the induction voltage regulator 1 is connected to the 220V mains through a power line, and the secondary side of the induction voltage regulator 1 is connected to the low-voltage side of the non-corona test transformer 2 through a coaxial cable. The high-voltage side of the non-halo test transformer 2 is first connected in series with the non-partial discharge protection resistor 3, then connected in parallel with the standard capacitive voltage divider 4, and then passed through the high-voltage lead 5 ...

Embodiment 2

[0060] A device for detecting partial discharge of a power transformer with a fluorescent optical fiber is the same as Example 1. Wherein said metal shielding light-proof box 7 has a length of 3.0m, a width of 2.0m, a height of 2.0m, and a wall thickness of 2.0mm. The inner diameter of the shell 21 is 200mm, the wall thickness is 8mm, and the height is 200mm. The outer diameter of the needle electrode 17 is 8 mm, the length is 50 mm, and the radius of curvature of the tip is 0.4 mm. The plate electrode 18 has a thickness of 5 mm and an outer diameter of 80 mm. A fluorescent optical fiber 22 with a length of 20 mm is installed in the housing 21 on one side of the needle-plate electrode.

Embodiment 3

[0062] A device for detecting partial discharge of a power transformer with a fluorescent optical fiber is the same as Example 1. Wherein: the length of the metal shielding light-proof box 7 is 3.5m, the width is 2.5m, the height is 2.2m, and the wall thickness is 3.0mm. The inner diameter of the shell 21 is 300mm, the wall thickness is 12mm, and the height is 300mm. The outer diameter of the needle electrode 17 is 12 mm, the length is 100 mm, and the radius of curvature of the tip is 0.8 mm. The plate electrode 18 has a thickness of 10 mm and an outer diameter of 120 mm. A fluorescent optical fiber 22 with a length of 40 mm is installed in the housing 21 on one side of the needle-plate electrode.

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Abstract

The invention relates to an apparatus and a method for detecting a partial discharge of a power transformer by utilizing a fluorescence fiber, more particular to a simulation experiment apparatus and a method thereof for a partial discharge of a needle-board electrode in a power transformer. The apparatus provided in the invention mainly comprises: an induction regulator; a dizziness-free test transformer; a partial discharge protective resistance; a standard capacitance voltage divider; a partial discharge generator, which is formed by a needle-board electrode, a fluorescence fiber and a housing; a photomultiplier; a direct current regulated power supply; and an oscilloscope and the like. According to the method provided in the invention, the apparatus is utilized; and a needle-board electrode partial discharge experiment in the air of a power transformer is simulated. According to the invention, partial discharge experiments of a transformer with different exerted voltages and in different spacings are simulated; besides, the apparatus has advantages of strong anti-interference capability, good insulating property and high detection sensitivity and the like. Moreover, the apparatus and the method can be widely applied to luminous characteristic researches of a power transformer on floating potential partial discharge, insulator surface discharge and partial discharge in a transformer oil and an SF6 of a GIS in the air medium.

Description

technical field [0001] The invention belongs to the technical field of on-line partial discharge (PD) monitoring of power equipment, and in particular relates to a simulated experimental device and method for partial discharge of needle-plate electrodes inside a power transformer. Background technique [0002] The power transformer is one of the essential electrical equipment in the power system, and its reliability plays a vital role in the operation of the power system, and partial discharge is one of the main reasons for the insulation degradation of the power transformer. Therefore, it is of great significance to implement on-line monitoring of the insulation status of power transformers. [0003] At present, the existing methods for detecting partial discharge of power transformers mainly include: pulse current method, gas chromatography and ultra-high frequency method. [0004] Pulse current method: It detects the pulse current caused by partial discharge in the trans...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 唐炬张晓星姚陈果欧阳有鹏陈伟根李剑杜林廖瑞金王有元
Owner CHONGQING UNIV
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