A method for on-line monitoring of transformer bushing moisture defects

A technology for transformer bushings and transformers, applied in the direction of testing dielectric strength, etc., can solve the problems of fluctuation and error of measurement results, no online monitoring of oil-paper insulation of transformer bushings, difficulty in applying frequency-adjustable AC voltage, etc. The effect of online monitoring

Inactive Publication Date: 2017-12-26
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology

This means that if the measured signal is sampled at a fixed frequency, it will bring large fluctuations and errors to the measurement results due to the fence effect and spectrum leakage
3) The current at the end screen of the transformer bushing is very small, only milliamp level. In order to convert the weak current signal into a voltage signal, an amplification circuit must be introduced to improve the signal-to-noise ratio of the signal
[0008] Since it is on the transformer running on-line, it is difficult to apply frequency-adjustable AC voltage, so there is no report on the application of transformer bushing oil-paper insulation on-line monitoring

Method used

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  • A method for on-line monitoring of transformer bushing moisture defects
  • A method for on-line monitoring of transformer bushing moisture defects
  • A method for on-line monitoring of transformer bushing moisture defects

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Embodiment Construction

[0028] Attached figure 1 It is a schematic diagram of field application of specific embodiments of the invention. 1 is the voltage measurement module for the secondary screen of the transformer bushing 5, and 2 is the ground wire current measurement module of the last screen 6 of the transformer bushing. These two modules output voltage and current signals to the signal acquisition Module 3, after A / D conversion, the signal acquisition module 3 is transmitted to the computer 4, and the computer 4 calculates the dielectric spectrum of the oil-paper insulation of the transformer bushing to determine whether the bushing is damp. 7 is a 50 ohm resistor, connected in series with the ground wire of the end screen 6, used to sense current signals and transmit the output to the current measurement module 2. The voltage measurement module 1 and the current measurement module 2 include conventional overvoltage protection circuits, amplifiers and level shifters.

[0029] The monitored tra...

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Abstract

The purpose of the present invention is to provide a new method for on-line monitoring of damp defects in transformer bushing insulation, which uses the transient voltage wave u(t) and current wave i(t) that appear on the bushing to reverse the dielectric properties of the oil-paper insulation of the bushing. The constant εr changes with the frequency to achieve the purpose of diagnosing whether the bushing is damp.

Description

Technical field [0001] The invention belongs to the field of on-line monitoring of transformer bushings in power systems, and relates to a new method for measuring damp defects of bushings. Background technique [0002] Capacitor bushing is currently the most commonly used type of transformer bushing. The condenser core between the guide rod and the flange is used as internal insulation. There are multiple metal plates in the condenser core to forcibly control the electric field inside and on the surface of the bushing. Make it uniform; fill insulating material between the metal plates. The insulation performance of the capacitor bushing mainly depends on the capacitor core. According to the different insulating materials of the condenser core, condenser bushings are divided into tape insulating bushings and oil-paper insulating bushings. At present, transformer bushings of 110kV and above usually use capacitive oil-paper insulated bushings. [0003] The insulation condition of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R31/12
Inventor 程养春蔡巍王广真龙凯华李志刚
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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