System and method for measuring high voltage cable space charges based on electroacoustic pulse method

A technique of electroacoustic pulse method and high voltage cable

Inactive Publication Date: 2014-02-26
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

The superposition of the Coulomb field and the applied electric field formed by these space charges will change the distribution of the original electric field, resultin

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  • System and method for measuring high voltage cable space charges based on electroacoustic pulse method
  • System and method for measuring high voltage cable space charges based on electroacoustic pulse method
  • System and method for measuring high voltage cable space charges based on electroacoustic pulse method

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Embodiment Construction

[0021] 1. Measurement principle of pulse electroacoustic method (PEA):

[0022] A high-voltage electric pulse with a narrow pulse width is applied to the test electrode, and the space charge in the sample generates a corresponding pressure wave pulse under the action of the pulse, the pressure profile of the pressure wave pulse and the volume density distribution of the space charge in the sample Correlation, the pressure wave pulse is measured by the pressure sensor, and the corresponding space charge distribution in the sample can be obtained. like figure 1 The schematic diagram of space charge measurement by electroacoustic pulse method is shown. Its working principle: the high-voltage pulse source 1 and the high-voltage capacitor C are connected in series to the upper and lower aluminum electrodes 2-1 and 2-2 at both ends of the sample 4, and at the same time, the DC high-voltage power supply 8 is also connected to the upper and lower ends of the sample 4 through the curr...

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Abstract

The invention relates to a system and a method for measuring high voltage cable space charges based on an electroacoustic pulse method. A high voltage pulse source and a high voltage capacitor are connected in series and are then connected with measuring electrodes at two ends of a tested piece, a high voltage power source is further connected with the measuring electrodes at two ends of the tested piece through a current limit resistor, a piezoelectric sensor closely clings to the lower measuring electrode, the piezoelectric sensor acquires a stress wave signal and sends the processed signal to a computer to form the measuring system, the high voltage power source can be a direct current high voltage power source and further can be an alternating current high voltage power source, the alternating current high voltage power source is connected with a phase detection unit, and a phase detection circuit outputs a synchronous control signal to a pulse generation unit of the high voltage pulse source. The high voltage power source forms space charges in an insulation layer of an electric power cable through electrodes, disturbance of the charges in the insulation layer of the electric power cable is realized through the high voltage pulse source to form dynamic stress waves, the measuring system acquires a signal of a pressure sensor, and a distribution state of the space charges of the electric power cable is analyzed. Through the system and the method, measurement on the distribution state of the space charges in the insulation layer of the electric power cable under the alternating current state is realized.

Description

technical field [0001] The invention relates to a space charge distribution measurement device, in particular to a high-voltage cable space charge measurement system and method based on an electroacoustic pulse method. Background technique [0002] Under the action of high temperature and high field of polymer materials, the molecular chain structure of the polymer will be broken, and these changes in chemical structure will lead to the formation of internal defects in the polymer. Under the action of the electric field, the carriers move along the direction of the electric field. When these carriers encounter the formed defects, they will be trapped by them, forming corresponding space charges. The superposition of the Coulomb field and the applied electric field formed by these space charges will change the distribution of the original electric field, thereby causing serious distortion of the electric field in the polymer body, which will lead to the development of the ele...

Claims

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Application Information

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IPC IPC(8): G01R29/24G01R29/14
Inventor 陈炯吴亮朱佳媛鲍克勤
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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