Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Moisture intrusion degree monitoring and evaluating method for power cable terminal

A cable terminal and power cable technology, which is applied in the direction of testing dielectric strength, dielectric performance measurement, measuring resistance/reactance/impedance, etc., can solve the problems of safe and reliable operation of medium and high voltage cables, cable insulation breakdown, and corrosion of shielding layers and other problems to achieve the effect of avoiding the terminal explosion problem and reliable operation

Active Publication Date: 2020-01-07
SOUTHWEST JIAOTONG UNIV
View PDF8 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the prolongation of the operation time, the XLPE cables and terminals are gradually dampened due to moisture intrusion. After being eroded by moisture, a series of physical and chemical effects will occur under the action of a strong electric field, and "water branches" will be formed along the direction of the electric field in the insulation. The phenomenon of XLPE cable insulation is becoming more and more serious, leading to breakdown accidents of cable insulation. Experiments have shown that when the humidity of the operating environment reaches above 65%, the XLPE cable insulation material may form water tree defects, which seriously affects its insulation performance.
In addition, the intrusion of moisture will lead to serious corrosion of the shielding layer, which will also concentrate the electric field of the cable and terminal insulation, which will increase the contact resistance and cause serious heat generation, resulting in a sharp decline in the insulation performance of the cable.
[0003] At present, the methods for detecting and judging the moisture intrusion of power cable terminals laid in cable trenches are still relatively scarce. The detection methods currently widely used in the field are not aimed at moisture intrusion faults, and the detection effect is very poor, and the main research has not paid attention to This problem has caused great trouble to the safe and reliable operation of high-voltage cables in cities

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Moisture intrusion degree monitoring and evaluating method for power cable terminal
  • Moisture intrusion degree monitoring and evaluating method for power cable terminal
  • Moisture intrusion degree monitoring and evaluating method for power cable terminal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0037] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0038] like figure 1 As shown, the cable terminal moisture intrusion inspection device is used to quickly test the moisture intrusion phenomenon at the high-voltage power cable terminal in the power system. Its structure and usage are as follows:

[0039] When laying the distribution network cables in the cable trench, the cable terminal moisture intrusion inspection device is arranged at the terminal part. After the alloy casing (4) is in, use the upper screw (5), lower screw (7), left end screw (6) on the left side of the inspection device, and the upper screw (13) and lower screw (16) on the right side to inspect The device is fastened, wherein the upper screw (5), the lower screw (7), and the left end screw (6) are tightly attached to the surface of the waterproof sheath (8), and the upper screw (13) and lower screw (16) are in contact with the met...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a moisture intrusion degree monitoring and evaluating method for a power cable terminal. The method comprises the following steps: arranging a cable terminal moisture intrusioninspection device at a terminal part when a power distribution network cable is laid; and monitoring the internal humidity of the cable terminal by using an inspection device, and judging whether theinspection device continuously monitors the internal humidity of the cable terminal or evaluates the moisture intrusion degree of the cable terminal. The method has the beneficial effects that a moisture phenomenon of the urban power distribution network cable terminal can be efficiently, accurately and conveniently evaluated in real time, the problem of terminal explosion caused by moisture intrusion in the cable terminal is avoided, and reliable operation of the method is realized. The moisture intrusion degree of the power cable terminal can be evaluated, and a basis is provided for further exploring the internal insulation state of the cable terminal.

Description

technical field [0001] The invention relates to the field of cable terminal fault evaluation, in particular to a method for monitoring and evaluating the moisture intrusion degree of a power cable terminal. Background technique [0002] With the continuous expansion of modern city functions, power cables, as a power energy transmission facility with excellent electrical and mechanical properties, have been more and more widely used. In recent years, cross-linked polyethylene cables have become the most important application choice in urban construction. Since the insulation of cross-linked polyethylene cables is an extruded whole, this type of cable is famous for its waterproof and moisture-proof performance at the beginning of its investment. It has been favored by users, promoted vigorously and replaced the original line on a large scale, and people often ignore the work of preventing moisture intrusion, so that large areas of cross-linked polyethylene cables are soaked in...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/12G01R27/26
CPCG01R27/2617G01R31/1272
Inventor 白龙雷何斌斌杨涵张靖康周利军
Owner SOUTHWEST JIAOTONG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products