Power supply of the production shop

Contents

Designations and abbreviations

Introduction

1 Characteristics of KZ ELTO JSC

1.1 History of the enterprise

1.2 Energy characteristics of the workshop

2 Calculation of shop distribution network

2.1 Selection of power supply scheme of shop electrical network

2.2 Calculation of electrical loads

2.3 Calculation of lighting loads

2.3.1 Selection and location of lighting fixtures

2.3.2 Calculation of lighting plant

2.4 Selection of number and capacity of shop transformers

2.5 Selection of package busbars

2.6 Selection of lighting network conductors section

2.7 Selection of lighting panels

2.8 Calculation of short-circuit currents in 0.4 kV network

2.9 Selection of protective and switching equipment

3 Calculation of high-voltage distribution network

3.1 Calculation of short-circuit currents in installations above 1 kV

3.2 Selection of 10 kV cable section

3.3 Selection of 0.4 kV RP rigid tyres

4 Calculation of electrical part of GPP

4.1 Design electrical loads of the enterprise

4.2 Selection of number and power of power transformers

4.3 Selection of high-voltage switches

4.4 Selection of disconnectors, separators, shorts

4.5 Selection of 10 kV RAM tires

4.6 Selection of 10 kV switchgear insulators

4.7 Selection of current transformers

4.8 Selection of voltage transformers

4.9 Selection of arresters

5 Occupational safety

5.1 Basic Legislative Documents

5.2 Analysis of harmful and hazardous factors

5.3 Measures to eliminate hazardous and harmful factors

5.4 Protective grounding

6 Industrial ecology

7 Economics

Conclusion

List of literature used

Selection of power supply scheme of shop electrical network

Shop power distribution networks shall:

ensure necessary reliability of electric power supply of electric power receivers depending on their category;

Be convenient and safe to operate;

have optimal technical and economic indicators (minimum of reduced costs);

have a design design that ensures the use of industrial and high-speed installation methods.

Shop networks of industrial enterprises are performed at a voltage of up to 1 kV (the most common is 380 V). The choice of the circuit and the design of the network workshops are influenced by such factors as the degree of responsibility of the electric power receivers, the modes of their operation and placement in the territory of the workshop, nominal currents and voltages.

All electric receivers of workshop No. 3 are relatively small in capacity and are relatively evenly distributed over the area of ​ ​ the workshop.

Electrical equipment operates under normal environmental conditions, soil in the area of ​ ​ the workshop is loam with a temperature of + 10 ° С.

All electrical receivers of the workshop can be classified as the II category of reliability of power supply.

For power supply of electrical receivers of the workshop, we select a main circuit of the type transformer-main unit. Main circuits provide high reliability of power supply, have versatility and flexibility (they allow replacing process equipment without any special changes in the electrical network), and allow you to abandon the use of a bulky and expensive switchgear or board.

The main main lines will not be used for power supply, and the distribution lines to which the electric receivers are connected will receive power directly from the buses of the complete transformer substation. This solution is explained by the fact that the total power consumption of the workshop electric receivers does not reach large values, and the main bus lines are designed for currents up to 6300 A. Therefore, the capacity of the distribution bus lines will be enough to ensure the reliability and quality of power supply to the electric receivers.

Distribution lines are made with complete distribution busbars manufactured by industry. Advantages of complete busbars include:

The ability to quickly change the network configuration

very small dimensions;

simple installation;

high degree of protection against external influences;

high fire resistance;

high short circuit resistance.

The disadvantage can be attributed to the high cost, compared to open busbars.

Due to the presence of bridge cranes on the section, the busbars are located on the columns and fixed on the brackets. Distribution of electric power to individual electric receivers is performed from branch boxes of busbars by wire of APV grade laid in metal ducts.