Method for on-line monitoring of damping defect of transformer bushing

A technology for transformer bushings and bushings, which is 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. Realize the effect of online monitoring

Inactive Publication Date: 2016-01-27
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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  • Method for on-line monitoring of damping defect of transformer bushing
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  • Method for on-line monitoring of damping defect of transformer bushing

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Embodiment Construction

[0027] attached figure 1 It is a schematic diagram of the field application of the specific embodiment of the invention, 1 is the voltage measurement module of the secondary screen 5 of the transformer bushing, and 2 is the ground wire current measurement module of the last screen 6 of the transformer bushing, and these two modules output the voltage and current signals to the signal acquisition Module 3, after A / D conversion, the signal acquisition module 3 transmits to the computer 4, and the computer 4 calculates the dielectric spectrum of the oil-paper insulation of the transformer bushing, and then judges whether the bushing is damp. 7 is a 50 ohm resistor, which is connected in series with the grounding wire of the last screen 6 to sense the current signal and transmit the output to the current measurement module 2 . The voltage measurement module 1 and the current measurement module 2 contain conventional overvoltage protection circuits, amplifiers and level shifters. ...

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Abstract

The invention aims to provide a new method for on-line monitoring of an insulation damping defect of a transformer bushing. Transient voltage waves u(t) and current waves i(t) that occur on the bushing are utilized, and through inversion of a changing characteristic of bushing oil paper insulation dielectric constant [epsilon]r with frequency, the purpose of diagnosing whether the bushing is affected with damp is achieved.

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] Capacitive bushing is the most commonly used type of transformer bushing at present. The capacitor core between the guide rod and the flange is used as internal insulation. There are multiple layers of metal plates in the capacitor core to forcibly control the electric field inside and on the surface of the bushing. Make it homogeneous; fill the 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 capacitor core, the capacitive bushing is divided into rubberized paper insulating bushing and oil paper insulating bushing. At present, capacitive oil-paper insulating bushings are usually used for transformer bushings of 110kV...

Claims

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Application Information

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Patent Type & Authority Applications(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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