AUTOMATIC LINE PLANT POWER SUPPLY

Contents

CONTENTS

Introduction

1. Process Description

2. Characteristics of consumers of automatic lines plant by degree of uninterrupted power supply

3. Calculation of distribution network of the shop site

4. Definition of electrical loads of the workshop

5. Circuit selection and calculation of in-house network with voltage up to 1 kV

6. Lighting design of the workshop

7. Calculation of lighting electrical network

8. Calculation of electrical loads

9. Cartogram of electrical loads

10. Reactive power compensation

11. Development of power supply diagram for voltage above 1 kV

12. Calculation of short-circuit currents

13. Selecting Sections of Current and Electrical Elements

devices with voltage higher than 1 kV

14. Development and economic justification of the internal design

power supply

15. Relay protection and automation

16. Electrical measurements and electricity accounting

17. Feasibility Study

18. Occupational safety

List of sources used

Paper

Diploma project 127 pages, 15 figures, 44 tables, 21 sources.

POWER SUPPLY, TRANSFORMER, FUSE, CIRCUIT BREAKER, REACTIVE POWER COMPENSATION, RELAY PROTECTION, LOAD, CABLE, MAGNETIC STARTER.

The object of development is the plant of automatic lines, specializing in the production of various metalworking machines (machines of high accuracy), automatic lines, as well as the accompanying specialization of the plant of products.

The purpose of the project is to design the power supply of the plant, as well as to consider issues related to the economic aspect of power supply design, labor protection, relay protection.

During the degree design, proposals such as the use of computers were tested. In particular, Microsoft Office Excel 2003 and Microsoft Office Word 2003 were used. The graphical part of the project was executed using the AutoCAD program.

An area of ​ ​ possible practical application is the use of the project in the design of production in a similar industry.

I confirm that in the diploma project, the calculation and analytical material objectively reflects the state of the developed object. All theoretical and methodological provisions and concepts borrowed from literary and other sources are accompanied by references to their authors.

Introduction

Rational power supply to industrial enterprises, individual production shops and other facilities is an important task at the stage of their commissioning. The bulk of the networks of industrial enterprises are networks with a voltage of up to 1 kV, they serve most technological processes. The proportion of these networks is approximately 6080% of the length of all electrical networks. Power supply systems providing electrical power to industrial facilities have a significant impact on the operation of electric drives, lighting, converter and electrical installations and, ultimately, on the production process as a whole. The pace of time requires a constant increase in the reliability of in-house electrical networks and in-house power supply networks, introducing new technological solutions and electrical equipment. Uninterrupted power supply of the receivers with energy of the required quality is an important condition for the normal operation of industrial enterprises.

The competent design of in-house and in-house networks of industrial enterprises will not only avoid non-production losses, but will also make it possible in the future without significant costs for the redesign and new electrical equipment to put into operation new technological equipment (or dismantle the old), to redevelopment production areas.

The diploma project solves the issues of designing the plant's power supply. Determination of electrical loads of workshops and the enterprise as a whole is carried out by the method of calculation load factor.

Calculations performed in the design were made according to the methodology set forth in the literature [1] taking into account the main requirements - "Rules for the installation of electrical installations."

The designed power supply scheme meets both the conditions of reliability and simple operation of both low-voltage and high-voltage equipment due to its location in convenient places for maintenance, as well as the use of complete equipment.

The diploma project also addresses the issue of saving electricity, which is currently relevant, when it is necessary to introduce new capacities on the one hand, and on the other, pay attention to increasing environmental problems.

Process Description

Procurement shop. The raw materials for the procurement shop come from other plants. The starting material for the workshop is sheet and bar metal, as well as metal in the form of bars. The workshop is equipped with guillotine shears for cutting sheets from 0.5 to 70 mm thick, cutting machines for a circle with a diameter of up to 350 mm, a range of crank presses for stamping and sheet metal billets, a press with a force of 1000 tons for sheet parts measuring 2000X3000 mm. Parts are procured in this shop for subsequent processing in other shops. Rolled stock and bars are cut into blanks on guillotine scissors, crank presses, as well as on cutting machines. A press is used to preform large sheet parts. Crane beams are used to move blanks around the shop area.

Machining shop. In the machining shop, excess allowances are removed, the contours of the blanks are as close as possible to future parts. The following equipment is located in the shop:

- coordinate-boring, grinding machines having high processing accuracy and longitudinal-machining machines of milling and strict groups with dimensions of parts up to 6000 mm.

- section of CNC machines including machining centers and programmatically controlled machines;

- a methase section with a group of turning-turret semi-automata and six-spindle machines for processing rod material with a thickness of 8 to 40 mm;

- thermostant compartment with a number of precision grinding machines for processing precise bodies of rotation, screw pairs and spindles;

- a section of gears, including tooth processing machines for helical and spur gears, including conical ones, with a diameter of up to 1000 mm and a module of up to 12, worm gears with a module of up to 4, rack gears up to 8 mm.

- section for manufacturing hydraulic cylinders with diameter from 50 to 160 mm and stroke length 1440 mm.

Crane beams are used to move blanks around the shop area.

Blacksmith shop. Equipped with hammers with a force of up to 1 ton. Hammers are used to press the largest parts. Crane beams are used to move blanks around the shop area.

Tool shop. Equipped with equipment for normalizing blanks in salt baths. Crane beams are used to move blanks around the shop area.

Galvanic workshop. In this workshop there is equipment for the application of coatings by chromium, galvanizing and chemical oxidation, the manufacture of plates by photographic printing. Crane beams are used to move blanks around the shop area.

Assembly and welding shop. Equipped with benches for welding and semi-automatic machines for welding in the environment of carbon dioxide. Welding structures are made of any weight, size and degree of complexity using manual arc welding and automatic welding in CO2. Crane beams are used to move blanks around the shop area.

Assembly shop. Crane beams are used to move blanks around the shop area.

Relay protection and automation

15.1. Select the required number and types of relay protection and automation devices.

To protect the lines from MCG to RP, we select a two-stage current protection, which we install from the power side. The first stage is a current cutoff without time delay, the second stage is maximum current protection (MTZ).

Automatic reserve entry (ATS) is installed on the circuit breaker between RP sections of the plant.

To protect transformers, we choose longitudinal differential protection, protection against overcurrent of external interfacial short circuits and overload protection, the last two protections are installed from the power side. We also install gas protection made using special gas relays.

Protection of elements in 0.4 kV network. The main protection in such networks is current. For its implementation, fuses and circuit breakers are used.

15.2. Selection of operating current.

The set of power sources, cable lines, power buses of switching devices and other elements of operational circuits constitutes the system of operational current of this electrical installation. In this scheme, alternating current is used as the operating current.