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Electroacoustic combined DC local discharging detecting device

A partial discharge detection, electro-acoustic technology, applied in the direction of testing dielectric strength, etc., can solve the problems of low sensitivity, inability to calibrate, acoustic signal attenuation, etc., and achieve the effect of low sensitivity

Inactive Publication Date: 2015-05-13
XI AN JIAOTONG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But it cannot be calibrated, and the sensitivity is low, and the acoustic signal attenuation is particularly serious in long-distance detection

Method used

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  • Electroacoustic combined DC local discharging detecting device
  • Electroacoustic combined DC local discharging detecting device
  • Electroacoustic combined DC local discharging detecting device

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing, the present invention is described in further detail:

[0033] see figure 1 , the present invention uses a high-voltage transformer to raise the power frequency AC 220V voltage to 100kV, conducts half-wave rectification through a silicon stack with a withstand voltage of 300kV and a flow capacity of 1A, connects a 1MΩ current-limiting resistor in series, and charges a 0.1nF filter capacitor. Output DC high voltage at the high voltage end of the filter capacitor.

[0034]The ultrasonic sensor adopts a contact ultrasonic sensor, the detection frequency is 35kHz-100kHz, and the center frequency is 55kHz, which is suitable for the coupling of ultrasonic signals generated by partial discharge in cables and accessories. In the case of weak signals, connect the ultrasonic sensor to the preamplifier through the BNC connector. The preamplifier is divided into three gears of 20 / 40 / 60dB, and the coupled signal is amplified according...

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Abstract

The invention discloses an electroacoustic combined DC local discharging detecting device. The device comprises a current transformer which is clamped to aground wire, and an ultrasonic sensor which is clung to a joint of a tested cable; the ultrasonic sensor is connected to a first data acquiring card of an industrial personal computer through a front amplifier; a high frequency current transformer is connected to a second data acquiring card of the industrial personal computer through a wide frequency amplifier; the output ends of the first data acquiring card and the second data acquiring card are both connected to a DC local discharging analyzing system of the industrial personal computer; the DC local discharging analyzing system is used for performing long-time detecting and filtering, analyzing an image through a Q-t image and providing recording parameters. According to the device, the 1-30MHz external high frequency current transformer and the ultrasonic local discharging detecting method are adopted for detecting to achieve DC local discharging detection of the laboratory environment and the field environment; in addition, whether various possible insulation defects occur in manufacturing or mounting of the tested cable can be detected.

Description

technical field [0001] The invention relates to an electroacoustic combined direct current partial discharge detection device. Background technique [0002] As early as the 1950s, people had recognized the development potential of cross-linked polyethylene (XLPE) insulation materials for DC submarine cables, and conducted a certain degree of research. And in the 1960s, cross-linked polyethylene (XLPE) insulated DC cables were successfully manufactured and operated as test lines with a voltage level of 200kV. However, due to the space charge effect, cross-linked polyethylene (XLPE) insulated DC cables often fail to pass the polarity reversal test, which hinders their commercial development. In the 1990s, due to the development of insulating materials and commutation technology, a new flexible DC transmission technology appeared, that is, the voltage source converter (VSC) based on turn-off devices was used instead of the current source converter (LCC). ) combined with XLPE ...

Claims

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Application Information

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IPC IPC(8): G01R31/12
Inventor 徐阳康强陈浩
Owner XI AN JIAOTONG UNIV
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