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Signal Enhanced Pressure Wave Method Model Cable Space Charge Test System

A technology of signal enhancement and space charge, which is applied in the direction of measuring devices, measuring electrical variables, instruments, etc., to achieve the effect of enhancing signal, ensuring true reliability, and improving system signal-to-noise ratio

Active Publication Date: 2017-09-12
NANJING NARI GROUP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the PEA method has certain limitations in the link of testing temperature.

Method used

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  • Signal Enhanced Pressure Wave Method Model Cable Space Charge Test System
  • Signal Enhanced Pressure Wave Method Model Cable Space Charge Test System
  • Signal Enhanced Pressure Wave Method Model Cable Space Charge Test System

Examples

Experimental program
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Embodiment Construction

[0037] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] Such as figure 1 As shown, a signal-enhanced pressure wave method model cable space charge test system includes a DC generator 11, a high-voltage lead 12, a stress cone 13, a waveguide 14, an interference-removing resistor 15, a protection resistor 16, a model cable 18, and a capacitor 19. Metal shielding box 20, pulse laser 21, amplifier 22, oscilloscope 23.

[0039] Such as Figure 5 As shown, the protective resistor 16, the model cable 18, and the capacitor 19 are arranged in the metal shielding box 20, the high-voltage lead wire 12 passes through the box wall of the metal shielding box 20, and the waveguide 14 is arranged on the box wall at the entrance of the high-voltage lead wire 12 At the place, the high-voltage lead wire 12 is connected in series with the anti-interference resistor 15; after the outer layer of the an...

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PUM

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Abstract

The invention discloses a signal-enhanced pressure wave method model cable space charge testing system. An optical hole is arranged on the box wall of a metal shielding box (20), and a pulse laser (21) is arranged at the optical hole. The surface of the outer semiconducting shielding layer of (18) is coated with a signal enhancer (17); the emitted light of the pulsed laser (21) can be irradiated on the signal enhancer (17) through an optical hole; the present invention provides a PWP method model cable The specific structure of the space charge test system; by installing a waveguide at the inlet of the high-voltage lead, connecting an anti-interference resistor in series with the lead, and using a metal shielding box, the impact of external interference signals on the space charge test system can be greatly reduced, and significantly improved. System signal-to-noise ratio.

Description

technical field [0001] The invention belongs to the technical field of model cable space charge testing, in particular to a signal-enhanced pressure wave method model cable space charge test system for model cable space charge testing. Background technique [0002] Under high DC electric field, the main problem faced by DC cables is that a certain amount of space charge will accumulate in the insulating medium or on the interface. If the space charge density is high enough, the local electric field may even exceed the breakdown electric field of the insulating medium, resulting in dielectric destruction. Space charge measurement techniques, including pulsed electro-acoustic (PEA) method, pressure wave propagation (PWP) method, etc., have strongly promoted the study of space charge. At present, the cable insulation thickness used for space charge test is 2~6 mm, which is called model cable, and the method usually used for space charge test of model cable is PEA method. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/24
Inventor 李栋朱智恩杨黎明郭世忠
Owner NANJING NARI GROUP CORP
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