Engineering plant power supply design

Contents

Introduction

1 Power supply of mechanical repair shop

1 Design Assignment

1.2 Brief description of the workshop according to the power supply conditions

1.2.1 Equipment Composition and Hart of the Process

1.2.2 Basic requirements to external power supply circuit

1.2.3 Characteristics of the construction part of the workshop

1.2.4 Characteristics of the workshop environment

1.2.5 Characteristics of the workshop according to electrical safety conditions

1.3 Calculation of electrical loads

1.3.1 Construction of shop network diagram

1.3.2 Determination of design load by workshop as a whole

1.3.3 Definition of the conventional center of electrical loads of the workshop

1.3.4 Selection of external power supply scheme of the workshop

1.4 Selection of number and capacity of shop transformers

1.4.1 Power selection of power transformer considering reactive load compensation

1.4.2 Selection of type and composition of switchgear of shop transformer substation

1.5 Calculation of electrical network for one connection

1.5.1 Characteristics of power supply and connection protection circuit

1.5.2 Selection of LV live parts

1.5.3 Calculation of short-circuit currents

1.5.4 Selection and check of circuit breakers

1.5.5 Check of distribution busbar by resistance to short circuit

1.5.6 Check of electrical mains against voltage loss

2 Power supply of machine-building plant

2.1 Design Assignment

2.2 brief description of the plant on power supply conditions

2.3 Calculation of electrical loads

2.3.1 Determination of lighting load by workshops and plant

2.3.2 Determination of power design load for individual workshops and plant as a whole

2.4 Selection of number and capacity of shop transformers

2.5 Selection of number and power of GPP transformers

2.6 Calculation of load cartogram

2.7 Selection of internal power supply voltage

2.8 GPP location selection

Conclusion

Literature

Introduction

Electricity, as a science, was formed in the late 70s of the XIX century. This happened after the first results appeared on electric drive, stations and networks, electric lighting, electric welding. The main ideas that contributed to the emergence of this science are: the idea of ​ ​ separating the production of electric energy from its consumption and the development of transmission theory.

In the field of consumer power supply, these tasks include increasing the level of design and development, introducing and rational operation of highly reliable electrical equipment, reducing non-production costs of electricity during its transmission and consumption.

Power supply systems of industrial enterprises are created to provide power supply to industrial receivers, which include electric motors of various machines and mechanisms, electric furnaces, electrolysis plants, devices and machines for electric welding, lighting plants, etc.

The main consumers of electric energy are industry, transport, agriculture, the municipal economy of cities and towns, and industry accounts for more than 70% of the consumption of electric energy, which should be spent rationally and economically in each enterprise, site and installation, therefore the electricity supply of industrial enterprises is given great importance. In this regard, the entire power supply system of industrial enterprises should meet the main requirements of electric receivers: in terms of reliability, quality, and energy efficiency.

Changes in production processes, usually due to their complexity, lead to the need to modernize and reconstruct power supply systems. They include high-voltage networks, distribution networks, and in some cases industrial CHP networks.

The main problem is the creation of rational power supply systems for industrial enterprises. It is associated with the choice and application of a rational number of transformations, the choice and application of rational voltages, the correct choice of the location of workshop and main distribution substations, further improvement of the methodology for determining electrical loads, rational choice of the number and power of transformers, as well as power supply schemes and their parameters. This leads to a reduction in power losses, increased reliability and contributes to the implementation of the general task of optimizing the construction of power supply systems, a fundamentally new setting for solving such problems as, for example, symmetry (leveling) of electrical loads.

The system approach in the solution of optimization tasks involves managing the quality of electricity, aimed at reducing its losses in industrial power supply systems, as well as improving the productivity of mechanisms and the quality of products. A comprehensive solution to this problem ensures a comprehensive increase in the efficiency of the national economy.

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