Experimental device for electrochemical corrosion research of water-blocking buffer layer of high-voltage cable

Abstract

The invention discloses an experimental device for electrochemical corrosion research of a buffer layer of a high-voltage cable, wherein the experimental device comprises a sealed cavity, and an electrode assembly, a pressure regulating assembly and a gas sensor which are mounted on the sealed cavity; the electrode assembly comprises an upper electrode and a lower electrode; the upper electrode comprises a plate electrode I and a rod electrode I which are integrally formed; the lower electrode comprises a plate electrode II and a rod electrode II which are integrally formed; the plate electrode I and the plate electrode II are located in the sealed cavity, opposite in position and arranged in parallel, iron circular rings are arranged on the opposite surfaces of the plate electrode I and the plate electrode II, and a cable sample is placed between the two plate electrodes of the upper electrode and the lower electrode; the pressure regulating assembly comprises a tray and a pressure regulating piece used in cooperation with the tray; and the tray is mounted at the end of the top end of the rod electrode I. According to the invention, the influence of the pressure and the current density on the electrochemical corrosion of the buffer layer in the actual cable operation is fully considered, and multi-factor combined corrosion research can be carried out on the basis of eliminating the measurement error of a hydrogen sensor.

Description

technical field [0001] The invention belongs to the technical field of power cables, and in particular relates to an experimental device for electrochemical corrosion research of a water-blocking buffer layer of a high-voltage cable. Background technique [0002] After years of development of power cables, the voltage level that the cables can withstand is gradually increasing, and they play a more important role in the power transmission and distribution network of the power system. In my country, the 110kV high-voltage cables are mainly high-voltage cables with corrugated aluminum sheaths, such as figure 1 As shown, it is mainly composed of a conductor 1, an inner semiconducting layer 2, an XLPE insulating layer 3, an outer semiconducting layer 4, a water-blocking buffer layer 5, an aluminum sheath 6, and an outer sheath 7 arranged sequentially from inside to outside; The water buffer layer is a semi-conductive structure with longitudinal water resistance and mechanical s...

AI Technical Summary

Problems solved by technology

When detecting the characteristic gas in the laboratory, the hydrogen sensor has a principle defect, that is, the hydrogen sensor is sensitive to CO and H 2 There is a problem of being able to detect at the same time, resulting in inaccurate detection results

In addition, relevant literature points out that the precipitation of white powder is related to environmental factors, but there is no complete system to conduct experimental research on the partial discharge that may occur in the water-blocking buffer layer and the electrochemical corrosion of the water-blocking buffer layer by environmental factors.

[0005] In summary, as an important link in the cable system, high-voltage cables play a pivotal role in the power system. The study of the electrochemical corrosion principle of the failure of the water-blocking buffer layer of high-voltage cables plays an important role in the safe operation of high-voltage cables. Usually, only a single variable can be experimentally studied, and the influence of CO cannot be eliminated. Therefore, the development of an experimental device for multi-factor joint corrosion is of great significance for the development of power cables.

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