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High-voltage direct-current cable insulating layer charge injection quantity characterization method

A charge injection, high-voltage DC technology, applied in the measurement of electrical variables, measuring devices, instruments, etc., can solve the problems of inability to distinguish the amount of charge injected on the surface of the insulating layer, unable to characterize the charge injection of the semiconducting layer, etc., to simplify the characterization method. Effect

Active Publication Date: 2020-08-21
CHINA SOUTH POWER GRID ELECTRIC POWER RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003]The current charge injection or accumulation inside the insulating material mainly adopts electro-acoustic pulse method (PEA), but the semi-conductive layer in PEA is mainly used for acoustic impedance matching, which cannot characterize the semi-conductive layer. Charge injection from the conductive layer itself to the insulating layer
In addition, due to the induced charge near the electrode, it is impossible to distinguish the amount of charge injection on the surface of the insulating layer

Method used

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  • High-voltage direct-current cable insulating layer charge injection quantity characterization method
  • High-voltage direct-current cable insulating layer charge injection quantity characterization method
  • High-voltage direct-current cable insulating layer charge injection quantity characterization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Objective: Under the conditions of pressurization temperature T1 and pressurization voltage E1, the injection amount of internal space charge and surface charge after pressurization t1 of two identical first sample and second sample.

[0062] Polarization process: put the first sample and the second sample between the first upper electrode 12 and the first lower electrode 13 of the polarization device 1, adjust the internal temperature of the first temperature control box 11 to T1, when the temperature When the set temperature is reached, the high voltage direct current source 14 is connected to pressurize the sample for polarization and charge injection. The pressurization time is t1, and the pressurized voltage of the high voltage direct current source 14 is E1.

[0063] Depolarization process: after the sample is cooled to room temperature, move the first sample between the second upper electrode 22 and the second lower electrode 23 of the thermal stimulation current ...

Embodiment 2

[0066] Objective: Under the conditions of pressurization temperature T2 and pressurization voltage E2, the amount of internal space charge injection and surface charge injection after pressurization t2 of two identical samples, the third sample and the fourth sample.

[0067] Polarization process: put the third sample and the fourth sample into the second position opposite to the gate electrode 42 on the ground electrode 31 of the integrated device 4, and adjust the internal temperature of the third temperature control box 41 of the integrated device 4 to T2 , when the temperature reaches the set temperature, connect the high-voltage direct current source 14 to pressurize the sample, the pressurization time is t2, and the pressurized voltage of the high-voltage direct current source 14 is E2.

[0068] Depolarization process: after the sample is cooled to room temperature, move the third sample into the thermal stimulation current testing system 2 between the second upper electr...

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Abstract

The invention provides a high-voltage direct-current cable insulating layer charge injection quantity characterization method. The method comprises: an internal space charge injection quantity measurement process and a surface charge injection quantity measurement process. Through the internal space charge injection quantity measurement process and the surface charge injection quantity measurementprocess, accumulated charges inside and on the surface of the insulating layer can be respectively measured through a sample polarized by a high-voltage direct-current power supply and subjected to charge injection treatment, so that the charge injection quantity of a metal / semi-conductive layer to the insulating layer is represented. In addition, the internal space charge injection quantity measurement process and the surface charge injection quantity measurement process can be synchronously carried out, and the charge injection quantity characterization method is simplified.

Description

technical field [0001] The application belongs to the technical field of surface charge measurement, and in particular relates to a method for characterizing the charge injection amount of the insulating layer of a high-voltage direct current cable. Background technique [0002] The space charge accumulation in the HVDC cable insulation system seriously affects the reliability of the HVDC transmission system, and also restricts the development of higher voltage DC equipment. The space charge of 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 injection amount of the insulating medium for the mechanism research of the space charge effect in the DC insulation system and the developm...

Claims

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Application Information

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IPC IPC(8): G01R29/24
CPCG01R29/24
Inventor 王婷婷罗兵陈少杰黄若栋肖微傅明利
Owner CHINA SOUTH POWER GRID ELECTRIC POWER RES INST
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