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Pressure wave method model cable space charge test system

A space charge and test system technology, applied in measurement devices, measuring electrical variables, instruments, etc., to reduce external electromagnetic interference, ensure true reliability, and improve signal-to-noise ratio.

Active Publication Date: 2017-09-12
NANJING NARI GROUP CORP +1
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  • Summary
  • 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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  • Pressure wave method model cable space charge test system
  • Pressure wave method model cable space charge test system

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0031] like figure 1 As shown, the pressure wave method model cable space charge test system includes a DC generator 11, a high voltage lead wire 12, a protection resistor 16, a model cable 18, a capacitor 19, a metal shielding box 20, a pulse laser 21, an amplifier 22, an oscilloscope 23 and a voltage equalizer Ring 30.

[0032] The protection resistor 16, the model cable 18, and the capacitor 19 are arranged in the metal shielding box 20, and the DC generator 11 and the high-voltage lead wire 12 are connected; They are respectively connected by a voltage equalizing ring 30; the high voltage lead wire 12 passes through the box wall of the metal shielding box 20.

[0033] like figure 1 and figure 2 As shown, the model cable 18 includes a first connection end 1801 close to the protection resistor 16, a middle section 1802 and a se...

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Abstract

The invention discloses a pressure wave propagation model cable space charge test system. A protection resistor (16), a model cable (18) and a capacitor (19) are disposed inside a metal shielding case (20). A DC generator (11), a high-voltage lead (12) and the protection resistor (16) are sequentially connected. The high-voltage lead (12) penetrates the wall of the metal shielding case (20). The protection resistor (16) is connected to a conductor of the model cable (18). The model cable (18) comprises a first connecting end close to the protection resistor (16) and a second connecting end far from the protection resistor (16), wherein the first connecting end of the model cable (18) is connected to the capacitor (19), and the second connecting end is grounded. The wall of the metal shielding box (20) is provided with a light hole, and the light emitted by a pulse laser (21) can shine on the model cable (18) through the light hole. According to the invention, the system can carry out pressure wave propagation (PWP) model cable space charge tests, strong signals can be obtained, the reliability of the signals can be tested, and the tests can be carried out without temperature limitation.

Description

technical field [0001] The invention belongs to the technical field of model cable space charge testing, in particular to a pressure wave method model cable space charge testing 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. [0003] In the PE...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R29/24
Inventor 杨黎明朱智恩李栋郭世忠曾浩高凯
Owner NANJING NARI GROUP CORP
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