Contact state and humidity adjustable cable water-blocking buffer layer structure simulation test system and method

Abstract

The invention discloses a contact state and humidity adjustable cable water-blocking buffer layer structure simulation test system and method. The system comprises a bottomless test box body with a ventilation opening in the top surface, and the interior of the bottomless test box body is provided with partitions and is divided into a monitoring area, a test area and a control area; a camera is placed in the monitoring area, an ablation platform is placed in the middle of the test area, humidifiers are placed at four corners in the test area respectively, electric fans are placed among the humidifiers, and a power bank is placed close to the partition; a PLC is placed in the control area, and a data line of the PLC penetrates through the side wall of the box body and is connected to an external computer; and data lines of the humidifiers and the electric fans penetrate through the partitions and are connected to the PLC. According to the system and the method, the structural characteristics of a corrugated aluminum sheath and a water-blocking buffer layer in the high-voltage cable are effectively restored, and the real working state of the water-blocking buffer layer under the actual cable operation condition is better simulated by adjusting the external voltage and current, the electrode position, the pressure and the environment humidity, so that the fundamental reason and the damage mechanism of ablation of the water-blocking buffer layer are favorably explored and analyzed.

Description

technical field [0001] The invention relates to the technical field of cable water-blocking buffer layer structure simulation tests, in particular to a cable water-blocking buffer layer structure simulation test system and method in which the contact state and ambient humidity can be freely adjusted. Background technique [0002] With the rapid development of China's economy, the scale of cities continues to expand, and people's living standards continue to rise, which puts forward higher requirements for power grid transmission capacity and power supply quality. Due to the limitations faced by overhead lines in corridors, landscapes, etc., underground cables are playing an increasingly important role in urban power supply systems. [0003] Existing high-voltage and extra-high-voltage cables usually use corrugated aluminum sheath structures, such as figure 1 shown. In this structure, the water-blocking buffer layer between the aluminum sheath and the insulating shield is a...

AI Technical Summary

Problems solved by technology

In response to the above three speculations, the researchers conducted electric field simulation and simulation experiments on the wrinkled aluminum sheath structure, and proved from different angles that the excessive resistivity of the water-blocking buffer strip and poor contact with the aluminum sheath may cause local electric field distortion. , causing partial discharge

However, these studies are more of a qualitative analysis, with a large degree of speculation, which neither effectively correspond to the structural characteristics of the corrugated aluminum sheath in the actual cable, nor show the occurrence of ablation of the water-blocking buffer layer , the basic process of development, therefore, lack of theoretical system and engineering guidance

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