Radio plant power supply

Contents

INTRODUCTION

LIST OF ACCEPTED ABBREVIATIONS

1 PRE-DESIGN ANALYSIS OF DESIGN OBJECT

1.1 General characteristics of the plant, process description

1.2 Design Input

1.3 Selection of rated voltage and classification of power consumers of the plant according to the category of reliability of power supply

1.4 General characteristics of the assembly shop

2. CALCULATION OF ELECTRICAL LOADS

2.1 General Information

2.2 Determination of design loads of workshops

2.3 Calculation of electrical loads of the assembly shop

2.3 Calculation of electric lighting load

2.4 Calculation of lighting of the enterprise territory

2.5 Calculation of total electrical loads of the designed plant

3 SELECTION OF SHOP TRANSFORMERS TAKING INTO ACCOUNT REACTIVE POWER COMPENSATION

3.1 General Information

3.2 Preliminary calculation of quantity and power of 10/0.4 kV transformers

3.3 Reactive power compensation at 0.4kV side

3.4 Clarification of the number and power of transformers 10/0.4 kV taking into account KMM

4 CALCULATION OF TOTAL LOAD ON 10 kV SIDE

4.1 Calculation of active power losses in shop transformers

4.2 Calculation of reactive power losses in shop transformers

4.3 Calculation of total load of the enterprise

5 SELECTION OF EXTERNAL VOLTAGE OF ELECTRIC SUPPLY

6 SAMPLE OF ELECTRIC LOAD CENTER AND CALCULATION OF LOAD CARTOGRAM

6.1 General provisions

6.2 Determining the Center of Electrical Loads

7 SELECTION OF GPP CIRCUITS AND INTERNAL POWER SUPPLY NETWORK

8 DETERMINATION OF QUANTITY AND POWER OF GPP TRANSFORMERS

9. CALCULATION OF SHORT-CIRCUIT CURRENTS OF POWER SUPPLY SYSTEM

10 SELECTION OF SECTION OF AIR AND CABLE LINES

10.1 General Information

10.2 Selection and grade of 110 kV air lines section

10.3. 10 kV Cable Line Tag and Section Selection

10.3.1 TC check against long-term permissible current

10.3.2 TC check by current economic density

10.3.3 Check cables for thermal resistance

11 SELECTION OF PROTECTION DEVICES OF THE DESIGNED NETWORK

11.1 Selection of equipment at 110/10 kV substation

11.2 Selection of 10kV GPP equipment for outgoing lines

12 DESIGN OF POWER SUPPLY SYSTEM OF ASSEMBLY SHOP

12.1 Design Object Overview

12.2 Selection of busbars of assembly shop

12.3 Selection of protection devices of 0.4 kV electrical installations

12.4 Selection of cross section of 0.4 kV cable lines

13 COMPARISON OF POWER SUPPLY SYSTEM VARIANTS OF ASSEMBLY SHOP

14 CALCULATION OF ASSEMBLY SHOP LIGHTING

14.1 General Information

14.2 Calculation of illumination by the luminous flux coefficient

CONCLUSION

LIST OF LITERATURE

Summary

This graduation qualification work (VKR) was carried out on the topic "Power supply to the factory for the manufacture of elevator winches." VKR describes the technological process of production, calculation of electrical loads, calculation of lighting load of workshops, selection of workshop transformers, calculation of electrical loads on MPP buses, calculation and selection of switching equipment and calculation of short-circuit currents, as well as the power supply scheme of the elevator winch shop.

In the work there is a graphic part consisting of 5 sheets, 6 figures and 29 tables.

Introduction

The topic of this graduation qualification work (VKR) is the design of the power supply system of the radio plant. The degree of development of the production of new radar installations determines the state and technological progress in the defense of the country.

The production of radar installations, which are constantly undergoing changes, requires frequent reconstruction and modernization in order to maintain competitiveness and high quality of products. This, in turn, requires frequent reconstruction and modernization of existing power supply systems.

The relevance of this topic of VKR is the development of a radio plant power supply system, which is a typical enterprise for the production of radar installations of various types and other communication installations serving for the defense of Russia .

Radar station (radar), radar is a system for detecting air, sea and ground objects, as well as for determining their range, speed and geometric parameters, which requires the correct technological process for effective use.

In the design process, on the basis of modern calculation methods and standards, an external and internal power supply scheme is being developed. Despite the fact that this VKR is a training design, it takes into account all the specifics of the design of a modern standard radio plant, such main tasks are considered as: calculation of power and lighting loads, selection of the number and power of transformers with a voltage of 110/10 kV and 10/0.4 kV, calculation of short-circuit currents at different sections of the circuit (power supply circuits), etc.

Pre-design analysis of the design object

1.1 General characteristics of the plant, process description

Radio plant refers to enterprises with serial production, including the main operations of the production cycle, including the main, auxiliary production.

The radio plant has the following production structure. The plant receives castings from the foundry located on the territory of the enterprise. In the tool shop, the necessary tools, accessories and calibers are prepared according to a previously drawn up program. The stamping shop belongs to the main production and is one of the main workshops of the plant. The quality and labor intensity of assembly works depends to a large extent on the quality of production of parts in procurement stamping shops. We can definitely say that the more the production of general consumption radio equipment will develop and improve, the more the number of stamped parts in the devices will become. It is important to note that the stamping shop is usually the richest in accidents. A worker who worked for a long time on stamping and had all his fingers on his hands was considered an extraordinary person. In the point of labor protection, workers should be paid much attention.

Revolver-automatic is the main procurement workshop. The workshop houses rows of revolver machines, as well as rows of machine guns working without any almost human intervention, throwing tens of thousands of small parts daily.

The final assembly of the plants itself takes place in the assembly shop. After careful rejection in the mechanical shop, all parts go to the warehouse of the assembly shop. Here, from all these parts, a complete assembly of the radar installation begins to be created. Assembly works belong to the category of works that are most difficult to normalize and mechanize. Usually in such workshops, there are different assembly processes for separate operations, assembly stages performed by different workers .

The designed radio plant is a medium-capacity enterprise. The main types of equipment are soldering stations, engines of lifting mechanisms, electric furnaces.

Selecting a Section of Air and Cable Lines

10.1 General Information

Electric power is transmitted from power supply source to receiving station of radio plant by air or cable lines. Sections of wires and cable conductors are selected according to technical and economic conditions.

The specifications include selection of sections for heating by design current, corona conditions, mechanical strength, heating from short-term heating by short-term current and voltage losses.

The economic conditions of the selection are to determine the section of the line, the costs for the construction of which will be minimal.

The technical and economic conditions during the calculation give different sections for the same line. The section that meets all requirements is finally selected.

Conclusion

In this final qualification work, the design of power supply for the radio plant was carried out. Based on the design assignment, initial data, process characteristics of the enterprise, calculations were made on the design of power supply systems for the plant and the necessary elements of the power supply system consisting of the following design stages were selected.

1) Calculation of electrical loads on the voltage 0.4 kV, by the method of demand coefficient. During the design, the issue of reactive power compensation by installing low-voltage capacitor plants on low-voltage TPP buses, as well as installing capacitor plants of the UK56 type 6.3 600 kVar on GPP buses is considered.

2) According to the design loads, taking into account the compensation of reactive power, the selection of workshop transformers and GPP transformers was made. GPP was selected taking into account the center of electrical loads, as well as the diagram of external and internal power supply. Of the calculations made, 7 complete 10/0.4 kV transformer substations with modern equipment were designed.

3) Short-circuit currents are calculated at characteristic points of the power supply system (110 kV, 10 kV and 10 kV KTP1 input), on the basis of which 110/10 kV PS equipment is selected

During the design, reference data from electrical equipment catalogs, partially taken from the Internet, as well as instructions and rules, in particular, "Rules for the device of electrical installations," were used.