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Method for characterizing space charge accumulation in insulating medium

A technology of internal space and charge accumulation, applied in the direction of measuring electrical variables, measuring devices, instruments, etc.

Inactive Publication Date: 2018-05-22
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of this application is to provide a method for characterizing the space charge accumulation inside the insulating medium, which is suitable for the space charge accumulation characterization of the insulating medium in a wide temperature range and a large electric field range, so that it can be used to study high temperature, low temperature, strong electric field and other special conditions Space charge accumulation characteristics inside the insulating medium to solve the problem that existing measurement devices cannot directly characterize the amount of space charge accumulation under special conditions

Method used

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  • Method for characterizing space charge accumulation in insulating medium
  • Method for characterizing space charge accumulation in insulating medium
  • Method for characterizing space charge accumulation in insulating medium

Examples

Experimental program
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Effect test

Embodiment 1

[0073] 1. Target: Low-density polyethylene with a thickness of 0.3mm (in this implementation, the density is 0.94g / cm 3 ) The amount of charge after 30min of polarization.

[0074] 1.1 Polarization treatment: place the first sample 151 with a thickness of 0.3mm between the first upper electrode 13 and the first lower electrode 14, set the voltage of the high-voltage DC source 11 to 9kV, and set the high and low temperature alternating control box 12 The temperature is 50°C. After the temperature reaches the set temperature and stabilizes for 2 hours, the first upper electrode 13 and the first lower electrode 14 are connected to the high-voltage DC source 11, and the first sample 151 is polarized for 30 minutes.

[0075] It is worth noting that when different polarization times are selected, the amount of charge accumulation inside the test material is different. This example studies the situation of polarization for 30 minutes; in actual experiments, the polarization time can ...

Embodiment 2

[0079] 1. The objective is the same as in Example 1, that is, to measure the electric charge of low-density polyethylene with a thickness of 0.3 mm after polarization for 30 minutes under the conditions of a polarization temperature of 50° C. and a field strength of 30 kV / mm.

[0080] 1.1 Polarization treatment: The same second sample 152 as in Example 1 was subjected to polarization treatment under the same conditions as in Example 1.

[0081] 1.2 Depolarization treatment: take out the second sample 152 polarized in step 1.1 and cooled to room temperature with insulating clips, and place it between the semiconductive layer 35 and the third lower electrode 34 of the space charge test system 3; The voltage of the pulse source 31 is set to 200V and the pulse width is 10ns by the second control unit 38, and the decay time is set to be 60min; the pulse source 31 is turned on for depolarization processing, and the second test object 152 internal charge is measured by the piezoelectr...

Embodiment 3

[0083] In this embodiment, embodiment 1 and embodiment 2 are combined into one embodiment, and Q1 and Q2 obtained in embodiment 1 and embodiment 2 are mutually verified, and it can be known that the order of magnitude of the charge Q of test sample 15 is 10 -8 C; thus, it can be seen that the space charge characterization method proposed in this application is effective, and the characterization method is reliable.

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Abstract

The invention relates to a method for characterizing a space charge accumulation in an insulating medium and belongs to the field of space charge research. The method comprises the steps of a polarization process and a depolarization process. The polarization process includes a step of placing a test sample between a first upper electrode and a first lower electrode, setting predetermined voltagefor a high voltage direct current source according to the needs of an experiment, and setting a predetermined temperature for a high and low temperature alternating control box, a step of connecting high voltage direct current source to the first upper electrode and the first lower electrode and polarizing the test sample, a step of cutting the high voltage direct current source after the completion of polarization and reducing the temperature of the test sample to a room temperature, and a step of taking the test sample out in an insulating condition and placing the test sample into a depolarization device for depolarization.

Description

technical field [0001] The invention relates to a method for characterizing space charge accumulation inside an insulating medium, belonging to the field of space charge research. Background technique [0002] The space charge accumulation in the HVDC insulation system seriously affects the reliability of the HVDC transmission system, and also restricts the development of higher voltage DC equipment. The accumulation of space charge inside the insulating material will cause the local electric field of the material to be distorted, and the long-term action will cause the material to age, affect its insulation performance, and directly lead to the breakdown of the material in severe cases. Therefore, it is of great significance to study the characterization method of the space charge accumulation inside the insulating medium for the mechanism research of the space charge effect in the DC insulation system and the development of the high-voltage DC insulation system. [0003] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R29/24
CPCG01R29/24
Inventor 李国倡魏艳慧郝春成雷清泉
Owner QINGDAO UNIV OF SCI & TECH
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