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High signal-to-noise ratio pressure wave method model cable space charge test system

A technology with high signal-to-noise ratio and space charge, applied in measuring devices, measuring electrical variables, instruments, etc., to improve test reliability, ensure true reliability, and improve system signal-to-noise ratio

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

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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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  • High signal-to-noise ratio pressure wave method model cable space charge test system
  • High signal-to-noise ratio pressure wave method model cable space charge test system
  • High signal-to-noise ratio pressure wave method model cable space charge test system

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Embodiment Construction

[0036] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0037] Such as figure 1 As shown, the pressure wave method model cable space charge test system is characterized in that it 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 and voltage equalizing ring 30.

[0038] Such as figure 1 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 ...

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Abstract

The invention discloses a high signal-to-noise ratio pressure wave method model cable space charge test system, the protection resistor (16), the model cable (18), and the capacitor (19) are arranged in a metal shielding box (20), and a DC generator (11 ), the high voltage lead wire (12), and the protection resistor (16) are sequentially connected, 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 high voltage lead wire (12) At the box wall of the entrance, the high-voltage lead wire (12) is connected in series with the anti-interference resistor (15); after the outer layer of the anti-interference resistor (15) is wrapped with a self-adhesive insulating tape, the cable stress cone (13) is wrapped; the present invention adopts Installing a waveguide at the entrance of the high-voltage lead wire, connecting an anti-interference resistor in series in the lead wire, and using a metal shielding box can greatly reduce the impact of external interference signals on the space charge test system and significantly improve the 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 model cable space charge test system with a high signal-to-noise ratio pressure wave method used 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 cabl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/24
Inventor 朱智恩杨黎明李栋郭世忠高凯曾浩
Owner NANJING NARI GROUP CORP
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