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Local discharging on-line detecting and positioning system for electric transformer

A power transformer and partial discharge technology, which is applied in the field of on-line partial discharge detection and positioning system of power transformers, can solve problems not involving the positioning of partial discharge sources, and achieve the effects of convenient maintenance, improved accuracy, and reduced costs

Inactive Publication Date: 2010-06-30
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But does not involve the localization of the partial discharge source
Moreover, patent application number 00812375.6, patent application number 96190440.2 and patent application number 00812375.6 all describe partial discharge detection and do not involve positioning.

Method used

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  • Local discharging on-line detecting and positioning system for electric transformer
  • Local discharging on-line detecting and positioning system for electric transformer
  • Local discharging on-line detecting and positioning system for electric transformer

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment one: see figure 1 and figure 2 , the power transformer partial discharge on-line detection and positioning system includes an ARM processor 2, the ARM processor 2 is connected to a multi-channel signal detection channel 1, an LCD display 3, a keyboard 4, an SD card holder 5 and a serial port 6 . There are multiple identical signal detection channels 1, and each detection channel 1 is sequentially connected to a photodiode 8, an I / V converter 9, an amplifier 10, a filter 11 and a threshold decision device by an optical fiber ultrasonic sensor 7 12 poses. The working principle is: each signal detection channel 1 is used to detect ultrasonic waves, it uses the optical fiber ultrasonic sensor 7 to convert the ultrasonic signal generated by the partial discharge into an optical signal, and then performs photoelectric conversion through the photodiode 8, and then through the I The / V converter 9 converts the current into a voltage, and amplifies it through the ...

Embodiment 2

[0026] Embodiment 2: This embodiment is the same as Embodiment 1, and the special feature is that the output of the fiber optic ultrasonic sensor 7 is a continuous wave optical signal.

[0027] The amplifier 10 adopts an instrument amplifier, and the magnification is more than 30 times.

[0028] The filter 11 is a band-pass filter with a passband range of 160KHz to 200KHz and an adjustable gain output.

[0029] The threshold decision unit 12 adopts a high-speed voltage comparator, and sets a threshold level that is about 0.5 volts higher than the reference voltage according to the magnitude of the noise.

[0030] The multi-channel signal detection channel 1 is connected to the I / O port of the ARM processor 2, and the ARM processor 2 uses an external voltage to trigger an interrupt for real-time monitoring.

[0031] The keyboard (4) adopts a 4*4 button keyboard for setting various parameters.

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Abstract

The invention relates to a local discharging on-line detecting and positioning system for an electric transformer, which comprises an ARM processor. The ARM processor is connected with a multi-way signal detecting channel, a LCD (Liquid Crystal Display) screen, a keyboard, a SD (Secure Digital) card seat and a serial port. The multi-way signal detecting channel is formed by an optical fiber ultrasonic sensor sequentially connected with an photoelectric diode, an I / V converter, an amplifier, a filter and a threshold judger. The optical fiber ultrasonic sensor in the multi-way signal detecting channel detects an acoustic transmission signal generated during local discharging, and the acoustic transmission signal is output by the threshold judger after photoelectric conversion, I / V conversion, amplification and filtration. The ARM processor is used for analyzing and processing the multi-way detecting signal, displaying the position of the discharging source on the LCD screen, storing data into the SD card, and sending the data to a host computer through the serial port. The invention has the advantages of simplicity, practicality, strong anti-electromagnetic interference property and stable operation, and can be used for detecting and positioning local discharging of the electric transformer.

Description

technical field [0001] The present invention relates to the partial discharge on-line detection and positioning system of power transformers. Specifically, it uses multi-channel signal detection channels to detect the acoustic emission signals generated by partial discharges inside the power transformer, and obtains the position of the discharge source through signal processing, which belongs to the photoelectric technology. field. Background technique [0002] With the rapid development of the national economy and the electric power industry, the scale of the power grid is expanding day by day, and the voltage level is further improved, which puts forward higher requirements for the stability and reliability of the power system and the operation status of various electrical equipment. As the key equipment of the power system, the power transformer's stability directly affects the stability of the power grid. Studies have found that nearly half of power transformer accident...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01S5/18
Inventor 陈娜陈振宜丁悦通孙庆国王婧庞拂飞王廷云
Owner SHANGHAI UNIV
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