Wire and cable is one of the indispensable raw materials for energy transportation, and it is widely used in economic development and manufacturing. Once the cable line has a common fault, it will not only help the safe and smooth operation of the power network, but also continue to cause property losses to the company, and more seriously, it will cause the destruction of the franchise. Therefore, how to check the problems and deal with common faults, to prevent the occurrence of common faults has become a major issue of concern to power companies at this stage, below to analyze the operation and maintenance of wire and cable related problems.

01 Wire and cable experiment and engineering acceptance put into use

In the whole process of project construction, in addition to work handover experiment and protective experiment, insulation layer experiment should be carried out to evaluate and check the cable quality and processing technology quality at each stage of project construction. Before laying, the experiment is carried out on the cable tray to determine the advantages and disadvantages of the cable. After laying and before laying, test whether the cable is damaged during the whole laying process; After the construction of the project, the cable barrel is tested to determine the quality of the cable joint. Before and after cable inspection, testing is carried out to clarify the quality of cable inspection. The specific contents of inspection are as follows:

01

The cable should be sorted neatly, the fixed and bending radius of the cable should be in line with the design drawing and related requirements, the cable should be free from mechanical damage, and the sign plate should be placed fully, appropriately and clearly. Oil-impregnated paper insulated wire and oil-type cable terminal equipment, the middle of the connection head should not leak oil;

02

There should be no dirt in the construction of the cable ditch and tunnel, the back cover of the cable ditch should be complete, and the lighting fixtures, natural ventilation, drainage pipes and other equipment in the tunnel construction should meet the requirements of the design scheme;

03

The marking pile of the directly buried cable should be consistent with the specific way, the interval should meet the requirements, and the marking should be clear, strong and durable;

04

Signs and night lighting equipment on both sides of the Strait and in the no-anchor area of the underwater cable route shall conform to the provisions of the design scheme.

02

Cable route operation common problems

No need for long-term over-load operation or over-temperature. Therefore, it is not necessary to ignore the detection of cable load current, external temperature and connector temperature;

Cable line route Coaxial cable maintenance can not be invested in reclosing. The common faults of the cable line are more common faults, and if the re-closing position, it will certainly expand the safety accident and threaten the smooth operation of the power network;

After the coaxial cable of the cable route is switched on, it is not necessary to ignore the inspection of the cable line. The key to check whether the cable path is excavated or whether the cable line is damaged, if necessary, further check and distinguish according to the experiment;

When inspecting the operation of the directly buried cable, it should be noted that the road surface around the cable route can not be excavated at will; Lifting objects, corrosive chemicals and temporary buildings are not allowed on the pavement around the cable route. Cable route marking pile and maintenance equipment can not be moved at will, disassembly;

The cable line must be tested again before it can be put into use when it is repaired and operated after being stopped.

03

Side search of wire and cable fault test

After the cable has a common fault, the general side search process is as follows:

1

Identify common fault characteristics

According to the occurrence of common faults and some simple experiments, analyze and judge the characteristics of common faults, and determine whether the common fault resistor is high resistance or low resistance, is a short circuit fault or a closed common fault, is a short circuit fault of the grounding device, disconnection, or their mixture, is a single phase, two phase or three phase common fault.

2

Burnout of common failure points

That is, the common faults of high resistance or short circuit fault are changed into common faults of low resistance according to the burn through, which is easy to carry out rough measurement;

3

Coarse measurement

On one side of the cable line, the instrument is used to measure the common fault spacing, and the common fault point is calculated by the technical document of the cable line.

4

Accurate measurement points of common fault points

The precise location of common fault points is defined according to the methods of shock charge and discharge acoustic measurement, acoustic magnetic induction method and acoustic magnetic synchronous measurement method.

04

Operation and maintenance of cable lines

Cable line operation and maintenance is the key to load monitoring, cable metal material sleeve erosion monitoring and insulation supervision at three levels, the key new projects include: carrying out cable line inspection, cable protection experiment, to avoid the damage of wire and cable external force, analysis of cable fault testing, cable fault testing and common cable fault maintenance. If the cable is damaged, it must be repaired or removed for complete fault detection. When disconnecting the cable, it can be selected for common failure causes or natural environmental characteristics, such as in areas with strong corrosion, high ambient humidity and high temperature, YJV high-density polyethylene cable can be applied. High-density polyethylene insulated wire and cable have high impact toughness, good resistance to natural environmental ground stress, high-quality electrical equipment characteristics and resistance to solvent etching. In addition, it can also improve its impact toughness according to the modification of armored cables, so that it can be integrated into the tunnel construction, cable ditch and other natural environment or directly buried in the ground.

Although the maintenance work is complicated, it is to ensure the normal operation of all cable lines, after all, maintenance has been more reasonable than maintenance after safety accidents. Cable fault test is not only likely to harm everyone's daily life or work, production and manufacturing, more serious is likely to lead to major safety accidents and life damage, this is not filled, therefore, the maintenance of wire and cable can not be ignored.

Qingdao Tianxing Cable Co., Ltd. focuses on the production of customized wire and cable manufacturers, main: fire wire and cable, power cable, control cable and other products, exported to more than 40 countries and regions around the world, the annual production capacity of 1 billion yuan. 6000 square meters of storage, standing hundreds of millions of inventory, order demand for rapid distribution and delivery, large prices more favorable. Hotline: 16678668098