Power supply system reconstruction

Contents

Introduction

1 Brief description of the enterprise

2 Power supply

2.1 Calculation of electrical loads

2.2 Selection of internal power supply scheme of the enterprise

2.2.1 Justification of received voltage values

2.2.2 Power supply reliability assessment

2.2.3 Determination of consumer transformer quantity

substations (TC)

2.2.4 Determination of design electrical loads TP-10/0.4 kV

2.2.5 Reactive power compensation

2.2.6 Determination of number of transformers in TP and their

rated power

2.2.7 Selection of section of conductors of power transmission lines taking into account

Feasibility comparisons of options

2.3 Selection of external power supply scheme of the enterprise

2.3.1 Calculation of sections of 10 kV cable lines taking into account

techno-economic comparison of options

2.4 Determination of short-circuit currents

2.5 Selection and check of selected electrical equipment according to conditions

normal mode and short-circuit currents

2.5.1 Selection of vacuum switches

2.5.2 Voltage Transformer Selection

2.5.3 Current Transformer Selection

2.5.4 Selection of input circuit breakers on TC

from 0.38 kV side

2.6 Protection of networks from emergency modes

2.6.1 10/0.4 kV power transformer protection

2.6.2 Protection of 0.38 kV line against short-circuit currents

2.6.3 Protection of power supply system equipment

from overvoltage

3 Automatic switching on of section switch reserve

4 Single-Phase Fault Protection Device

4.1 Single-phase earth faults and methods of protection against them

4.2 Solving the Problem of Network Fault Protection with

specific engineering developments

4.3 Single-Phase Centralized Protection Device

to ground in function of line protection device actuation

4.4 Determination of cost-effectiveness of special part

5 Organization of electric farm operation

6 Health and Safety

6.1 Safety requirements for maintenance of electrical installations

6.2 Calculation of lightning protection and grounding parameters

7 Environmental protection

8 Economic part of the project

Conclusion

List of literature used

Introduction

The task of designing power systems is the development and feasibility study of solutions combining the formation of energy associations and the development of electric stations, electric networks and their operation and control facilities, which ensure optimal reliability of electric consumers.

Increasing the efficiency of the use of technical potential, as well as of all types of energy resources within the country using a large scale of energy-saving technologies, is a crucial task of energy policy.

The fuel and energy complex plays a special role in the development of the state, in improving the quality of life of the population, which puts it at the top of the priority for investment.

The purpose of any technical and economic calculations should be to choose the most economical and at the same time sufficiently technically perfect solution of a particular engineering problem. In industrial power supply, such calculations compare the economy of several technically equivalent options that provide a fairly perfect solution to the problem of power supply of specific consumers with high-quality electric energy. The compared options are evaluated according to two main economic indicators: capital investments in the construction of the power supply system and annual operating costs. Both of these indicators ultimately determine the cost of electricity production (at electric stations) or the cost of transferring energy from a powerful power system, where its cost is known, to consumers.

The main tasks to be solved during the design of the power supply system include the following: selection of the most rational, from the point of view of technical and economic indicators, power supply scheme; correct technical and economical reasonable, you-power selection of substation transformers; selection of economically feasible operation mode of transformers; selection of rational voltage, size of investments, consumption of non-ferrous metal value of electric power losses and operating costs; selection of electrical devices in accordance with the requirements of the technical and economic purpose-difference; selection of the section of wires, buses, cables depending on a number of technical and economic factors; selection of conditions that meet the requirements of safety, environmental protection.

The power supply system of the enterprise consists of power supply sources and power transmission lines that transfer electric energy to the enterprise, lowering, distribution and conversion substations and overhead line cables connecting them, as well as current conductors that provide electric energy supply to its consumers at the required voltage.

The requirements for the power supply of enterprises depend mainly on their power consumption and the nature of electrical loads, the peculiarities of production technology, climatic conditions, environmental pollution and other factors.

The practice of operating power supply systems of industrial enterprises shows that the most reliable are power supply systems containing a minimum number of switching devices (switches, disconnectors, etc.) mounted with high quality, with timely maintenance and replacement of obsolete equipment.

Taking into account the above, the enterprise and any its element (workshop, limit, building, etc.) should be considered as a system interconnected with environmental energy and actively perceiving dispersed low-potential energy with its transformation to the required potential. As can be seen, a distinctive feature of energy-active industrial systems is that they are endowed not only with the ability to consume energy from the external environment (power system, autonomous source), but also with the ability to capture, transform and transfer for use, both to the internal and external environment (power system) energy lost in the technological and energy technological processes of the enterprise (losses, waste, secondary resources ).

Thus, increase in efficiency of use of energy resources at the industrial enterprise is connected with application of the power active systems calculated on perception and transformation of the dispersing low-potential energy, use energy saving the equipment and technologies and application of renewables. The latter can be carried out simultaneously with changes in the structures of buildings, structures and technological installations, the use of complex agricultural and industrial modules. The efficiency of increasing the energy activity of industrial production, in this case, will be associated with the degree of substitution of energy of non-renewable sources (energy, fuel from the outside), energy obtained through the introduction of energy-active systems. By the degree of shared substitution of energy and fuel received from the outside, a gradation of enterprises of industries in energy activity can be developed.

Power supply

The clear operation of modern industrial enterprises with their complex technological processes and the wide use of automatic control and control tools largely depends on the reliability and quality of power supply systems. Therefore, the most important requirements for the designed and existing power supply systems of industrial enterprises are reliability, efficiency and ensuring the required indicators of electricity quality. In recent years, the company has increased the accident rate and equipment failure. Due to the fact that the enterprise has been operating for more than 30 years and during this period there has never been a replacement of supply lines, transformer substations, equipment of the main distribution point, etc., according to PUE, it is required to replace technically and obsolete equipment for a reliable power supply system. For these purposes, we will calculate the power supply system and replace the equipment.