What are the business processes of the transmission line project department?

When choosing a cable, many factors should be considered. 1. Check the CCC certification mark. Cable products are national compulsory safety certification products, and all manufacturers must obtain the CCC certification mark certified by the China Electrical Products Certification Committee.

2. Look at the inspection report. As a product that affects the safety of people and property, cables have always been listed as the focus of supervision and inspection, and regular manufacturers are subject to inspection by the supervision department on a regular basis. Therefore, the seller should be able to provide the inspection report of the quality inspection department, otherwise, the quality of the cable product will lack basis.

3. Pay attention to packaging. The packaging of wire and cable products is the same as other products, and all large and medium-sized regular enterprises that produce products that meet the requirements of national standards pay attention to product packaging. When purchasing, pay attention to the packaging to be exquisite and the printing to be clear

Let me tell you about some of the work of the transmission line construction project department.

Build a point - the construction of the project department, rent a house, purchase daily office supplies, broadband, fax, rules and regulations, and organize the image schedule on the wall. Get in touch with the supervision project department, the owner's project department and other bid construction project departments to facilitate future work.

Line retest - retest the pile position and hand over the pile to the construction team.

Before the start of construction, various documents are submitted for review, participate in the design disclosure meeting, and do the secondary inspection of basic materials.

Carry out the construction safety technical disclosure, and start the foundation.

Grasp the progress of the construction site and manage the quality and safety of the construction site. The early personnel of the project department will pay for the land occupation costs.

Group tower money quality acceptance.

The group of towers begins. Quality acceptance before wiring.

The wiring begins. Completion and acceptance of the project.

Data archiving. The latter is more general, and basically every branch project is about the same.

[Lu Guozhi] 1. Quality and technology:

1. Technical disclosure system.

2. Construction drawing review system.

3. Management system for design change and material substitution.

4. Engineering technology management system.

5. Quality inspection plan.

6. Quality assurance measures.

7. Concealed visa system.

8. Quality management system.

9. Material management system.

10. Civilized construction and environmental protection management measures.

11. Measures for the management of technical files.

12. Measures for the management of engineering information.

13. Measures for the management of planning and statistics.

14. Technical inspection system.

Second, the security aspect:

1 Safety Construction Responsibility System 1

2 Safety construction education and training system 7

3 Safety Construction Inspection System 7

4 Safety Construction Measures and Safety Construction Work Ticket Management System 85 Accident Investigation, Statistics, Handling and Reporting System 9

6 Safety reward and punishment system 13

7 Safety Management System for Subcontracted Projects 14

8 Safety work regular meeting system 15

9 Management System for Safe Use of Electricity 16

10 Safety Protective Equipment Management System 18

11 Safety and health management system for dust, poison and radiation 22

12 Fire and explosion-proof safety management system 24

13 Safety management system for machinery and tools 27

14 Vehicle traffic safety management system 32

16 Civilized construction and environmental protection management (substation engineering part) management system 3517 Safety facilities management system 37

18 Life Hygiene Supervision and Management System 41

19 Overtime control management system 42

20 Special Protection Management System for Female Workers 43

21 Management system for work tickets and operation tickets 44

22 Construction site access management system 46

23 Finished product protection management system 47

24 Safe and civilized construction deposit 47

According to the material used, power lines are mainly divided into two types: overhead lines and cable lines;

According to the use of the line, power lines are mainly divided into two types: distribution lines and transmission lines; The distribution line is the line that directly supplies power to the user, and the voltage is low, generally referring to the 10kV high-voltage line and the 380V low-voltage line; Transmission line refers to the line connecting two public substations with higher voltage, generally referring to the line with a voltage level of 35kV and above;

It can be seen that the cable line is a power line composed of cable materials; Overhead distribution lines are distribution lines composed of power conductors laid by overhead means; Overhead transmission lines are transmission lines composed of power conductors laid overhead.

Generally, after the completion of the foundation reaches 70% according to the owner's requirements, it can apply for conversion acceptance.

It doesn't matter how many parties you have, the main thing is to get the maintenance period.

Compound positioning, pit digging, foundation pouring, assembling towers, erecting lines and optical cable ground wires. Acceptance is completed.

1. New personnel are not allowed to patrol the line alone.

2. There must be two people to patrol the line in remote mountainous areas and at night, and two people should be carried out in summer and snowy days.

3. Single-person patrol line, it is forbidden to climb the tower.

4. The night patrol line is carried out along the outside of the line and along the upwind side on windy days.

5. The accident patrol line should always be considered to be live on the line, and even if the line has been cut off, it should be considered that there is a possibility of power transmission at any time. And all the line segments in charge should be patrolled without leaving blanks.

6. When it is found that the conductor is broken to the ground or suspended in the air, try to prevent pedestrians and vehicles from approaching within 8 meters of the broken line, and at the same time quickly report to the superior and wait for treatment.

1. Resistance:

Non-ferrous metal wires (including aluminum wires, steel-core aluminum wires, and copper wires) per unit length of electricity.

The resistance can be calculated by referring to the principle that the resistance of a conductor is proportional to the length, the resistivity of the conductor, and inversely proportional to the cross-sectional area.

2. Reactance: The reactance of the power line is formed due to the alternating magnetic field generated around the wire when the three-symmetrical alternating current passes through the wire. For three-phase transmission lines, each phase line has self-inductance and mutual inductance, and when the symmetrical arrangement or asymmetrical arrangement of the three-phase line is completely transposed, the unit length reactance of each phase conductor corresponding to the self-inductance and mutual inductance can be calculated.

3. Conductivity. The conductance of overhead transmission lines is mainly related to the corona loss of the line and the leakage resistance of the insulator.

Usually the former plays a major role, while the latter is often negligible due to the high level of insulation of the line, and the leakage resistance will only increase in rainy days or severe pollution.

Resistance r: reflects the loss of active power (thermal effect) when the current passes through the line;

reactance x (inductance l): reflects the magnetic field effect generated around the current-carrying line;

Conductance G: reflects the active power loss caused by the corona phenomenon;

Electron B (capacitance C): Reflects the electric field effect generated around the current-carrying line.

The construction of high-voltage transmission lines inevitably has to cross large rivers or straits and harbors. Due to the power transmission across a wide water surface.

The line has a large spacing, and many rivers or straits still have navigation requirements, which require special design. Generally speaking, the span is more than 1000m, the straight line spans the tower tower and is more than 100m high, there are navigation requirements, and the transmission line that requires special design is called a large-span transmission line. Big.

Crossing the transmission line is often the bottleneck section of the transmission line, and the design life expectancy is considered as 50 years. Large span design weather bar.

The pieces are harsher than the general line, and the safety requirements are also higher than the general line, the amount of work is large, and the construction period is long. A big leap forward.

The unit investment of power line engineering is more than ten to dozens of times higher than that of general transmission lines. The investment in a single project is tens of millions.

yuan, the investment is as high as hundreds of millions of yuan. Therefore, it is necessary to do extensive, in-depth and meticulous work in the large-span transmission line project, optimize the design, and at the same time promote the application of new technologies, new processes and new equipment. Optimized and advanced design can drastically reduce large spans.

The material consumption of the project, the reduction of project investment, and the shortening of the construction period have significant economic and social benefits.