110/35/6 sq transit substation design

Contents

Introduction

Structural Diagram Development

Selection of number and power of communication transformers

Selection of communication transformers for the first variant

2.1.1.Selection of communication transformers

2.1.2. Power Flow Diagram

2.1.3. Plotting Load

Selection of communication transformers for the second option

Selection of communication transformers

Power Flow Diagram

Plotting Load

Calculating the Number of Lines

Selecting switchgear diagrams

Selecting switchgear diagrams for the first option

4.2. Selection of switchgear diagrams for the second option

Feasibility comparison of options

5.1. Capital Cost Calculation for Variant No.

5.2. Capital Cost Calculation for Variant No.

Development of auxiliary power supply scheme

Calculation of short-circuit currents

Compilation of the calculation diagram

Calculation of short-circuit current at point K

Calculation of short-circuit current at point K2 with QB on

Calculation of short-circuit current at point K2 with QB off

Calculation of short-circuit current at point K3 with QB off

Calculation of short-circuit current at point K3 with QB on

Selection of switches and disconnectors

8.1 Selection of switches and disconnectors for 110kV

8.2 Selection of switches and disconnectors for 35kV

8.3Selection of switches for 6 kV

Selection of current and voltage measuring transformers

Selection of measuring transformers on the 110 kV side

Selection of measuring transformers on the 35 kV side

Selection of measuring transformers on the 6 kV side

Selection of current-carrying parts

10.1. Selection of busbars and current-carrying parts of 110 kV switchgear

10.2. Selection of prefabricated tires and live parts of 35 kV switchgear

10.3.Selection of prefabricated tires and 6 kV RP current-carrying parts

Switchgear Design Selection

Conclusion

List of literature

Appendix A

Appendix B

Z a d a n e e

for a course project

1. Topic of the course project (work)

110/35/6 kV transit substation

theme name

2. Main content:

2.1. Communication with the system via 110 kV VL.

2.2. Output from buses: transit power.

2.3 Power factor.

2.4 Consumer - light industry enterprise.

2.5 Maximum load usage time - according to load schedule.

2.6 Rated capacity of the power system of the first connection by 110 kV is.

2.7 Relative nominal resistance of the first power system.

2.8 Length of power transmission lines with power system

3. Formalization Requirements:

3.1. Explanatory note shall be executed in Microsoft Word editor in accordance with the requirements of STO UGATU

3.2 The explanatory note shall contain the following sections:

Annotation; administration; selection of structural scheme, number and power of transformers with thermal calculation; Calculation of the number of lines selection of switchgear diagram with feasibility analysis of variants; selection of auxiliary power supply scheme; calculation of short-circuit currents; selection of switches, disconnectors, current and voltage transformers; selection of main current-carrying parts; selection of switchgear design; conclusion.

3.3. Contents of the graphic part of the project:

Complete schematic diagram of the transit substation; 110 kV OPU section.

Summary

In this course project, a 110/35/6 kV transit substation is being developed. Communication with the system via 110 kV VL. The consumer is a light industry enterprise.

Initially, two versions are presented. For both options, the main equipment (communication transformers and their number) is selected. After selecting switchgear diagrams for high, medium and low voltages, a feasibility comparison of the options is made. Based on this comparison, a cheaper and more reliable option is determined. Further calculations are made for the selected circuit: calculation of short-circuit currents, selection of equipment (auxiliary transformers, shutdown

telly, disconnectors, current and voltage measuring transformers, current-carrying parts) and RP design description.

The graphical part of the course design contains drawings of the full schematic diagram of the substation and the section. Specifications are attached to the drawings.

Introduction

Electricity is an energy industry that includes the production, transmission and marketing of electricity. Electricity is the most important energy industry, which is explained by the advantages of electricity over other types of energy, such as the relative ease of transmission over long distances, distribution between consumers, as well as conversion to other types of energy (mechanical, thermal, chemical, light, etc.). A distinctive feature of electric energy is the practical concurrency of its generation and consumption, since electric current spreads through networks at a speed close to the speed of light.

According to OJSC "SO UES," electricity consumption in the Unified Energy System of Russia in January 2014. amounted to 97.5 billion kWh.

The total volume of electricity consumption and generation in Russia as a whole consists of indicators of electricity consumption and generation of facilities located in the Unified Energy System of Russia, and facilities operating in isolated energy systems (Taimyr, Kamchatskaya, Sakhalin, Magadan, Chukotka, as well as energy systems of central and western Yakutia). In January 2014, thermal power plants (TPP) carried the main load to meet the demand for electricity in the UES of Russia, the production of which amounted to 62.5 billion kWh. The production of hydroelectric power plants for the same period amounted to 15.1 billion kWh, the production of nuclear power plants - 16.0 billion kWh, the production of power plants of industrial enterprises - 5.1 billion kWh.

The EEC of Russia is the world's largest centrally controlled energy association. The main share in the structure of generating capacities falls on thermal power plants powered by organic fuel. They achieved high technical and economic indicators. The specific consumption of conventional fuel per 1 kW * h of released electricity is about 340 g at the TPP. A distinctive feature of the domestic electric power industry is the wide construction of thermal power plants (CHP), which provide the consumer with not only electricity, but also thermal energy due to the heat of exhaust steam. Combined energy production at the CHP gives up to 25 million tons of nominal fuel savings per year (11% of all fuel going to electricity production). Importance is attached to the use of cheap coal as fuel for thermal power plants.

There is also a drawback in the use of these power plants is environmental pollution. Thermal power plants that burn a significant amount of fuel are one of the major sources of atmospheric pollution, since in addition to the main combustion products of carbon and hydrogen, CO2 and H2O, which are not toxic, emit ash, sulfur oxides SO2 and SO2, nitrogen oxides NO and NO2, some fluoride compounds, etc.

To protect the atmosphere from harmful emissions of TPP, it carries out:

- preliminary purification of fuel from harmful impurities - ash and sulfur;

- cleaning of flue gases from ash, sulphur oxides and nitrogen;

- dissipation of flue gases through high pipes;

- complex energy-technological use of fuel, which ensures reduction of harmful emissions.

Knowing that natural resources are limited, the state and government are interested in finding alternative sources of electricity. Wind, tidal and geothermal power plants are among the promising ones. But so far their share in electricity generation in Russia is small. In addition, in the future, it is possible to use almost free and infinite power by a controlled thermonuclear reaction (hydrogen synthesis). But so far all this is in the development stage, because the thermonuclear reaction takes place with a huge release of energy, in a short period of time. With real scientific achievements, it is not yet possible to obtain this type of energy.

Selecting switchgear diagrams

Main requirements for diagrams:

Switchgear diagrams of substations during specific design shall be developed on the basis of power system development diagrams, district or facility power supply diagrams and other electrical network development works and shall:

- ensure the required reliability of power supply to ME consumers in accordance with categories of electric receivers in normal and post-accident modes;

- Take into account the perspective of the development of FS;

- provide possibility and safety of repair and operation works on individual circuit elements without disconnection of adjacent connections;

- Ensure visibility, economy and automation.

Since the light industry enterprise is, according to PUE, an electric receiver of category I - no interruption in power supply is allowed, the circuits must meet the requirements of reliability .

Conclusion

In this course project, a 110/35/6 kV transit substation was calculated. Main equipment is selected, the number of lines on high, medium and low voltage buses is calculated, RP diagrams according to typical design materials are selected.

Short-circuit currents were calculated for three points, according to the results of which switches and disconnectors, current and voltage transformers, and current-carrying parts were subsequently selected.

In addition, the substation's auxiliary power supply scheme was compiled and an auxiliary transformer was selected.

Further, in accordance with the PUE, the designs of the RMS and the RMS (RMS) were selected.

During the design of the substation, modern equipment was chosen, which ultimately increases the total efficiency of the substation and the reliability of its operation and, in addition, improves the environmental indicators of the power transmission and distribution process.

The graphic part of the course design shows the full electrical schematic diagram of the dead end substation 110/35/6 kV, as well as the section of the 110 sq OPC lines according to the scheme "Two working and bypass bus systems."