Power supply of residential microdistrict

Contents

TABLE OF CONTENTS

INTRODUCTION

1 GENERAL CHARACTERISTICS OF CITY POWER SUPPLY SYSTEMS

2. DETERMINATION OF DESIGN AREA DESIGN LOADS

2.1 Calculation of loads of residential buildings and institutions for cultural purposes

2.2 Determination of design lighting load

2.3 Total power consumption in the projected area

3 SELECTION OF POWER AND TYPE OF 10/0.4 kV TRANSFORMER SUBSTATIONS

3.1 Design Baselines

3.2 Selection of power and type of transformer substations 10/0.4 kV

3.3 Summing up loads and determining the location of the power center

4 Generation and selection of diagrams and parameters of 380V distribution networks

4.1 Selection of cross sections of 380V cables

4.2 Selection of TC sections by heating

4.3 Check of selected sections against permissible stress losses

5 COMPARISON OF 0.38kV NETWORK VARIANTS ACCORDING TO DISCOUNT MINIMUM CRITERION

5.1 Calculation of investments

5.2 Calculation of costs

6 FORMATION AND SELECTION OF STRUCTURE, DIAGRAM AND PARAMETERS OF 10 kV ELECTRIC NETWORKS OF THE CITY AREA

6.1 Determination of flow distribution in 10 kV networks

6.2 Selection of 10 kV cable conductors sections by current economic density

6.3 Check of selected sections of 10 kV cable cores according to permissible heating condition

6.4 Check of selected sections of 10 kV cable cores for thermal resistance to short-circuit currents

6.5 Check of selected sections against permissible stress losses

7 QUALITY OF VOLTAGE ON ELECTRIC RECEIVERS OF RESIDENTIAL AND PUBLIC BUILDINGS OF MICRODISTRICT

7.1 Evaluation and assurance of voltage quality by its deviation from nominal

8 TECHNO-ECONOMIC INDICATOR OF THE NETWORK

Introduction

At the present stage of the development of modern society, electricity and centralized heat supply have become an integral part of our daily life. Without them, it is difficult to imagine life, modern cities and towns, which are large consumers of electric energy in the country. The efficiency of the functioning of a large number of urban and industrial facilities located on its territory depends on how rationally the city's power supply system is designed.

Consumers of electric energy located on the settlement territory of the city are conditionally divided into two main groups: residential buildings and public utilities.

Electricity consumption in residential buildings is determined by the lifestyle of the city's population. In modern residential buildings, a large number of different electric receivers are used, which are divided into electric receivers of apartments and electric receivers of general purpose.

The purpose of this diploma project is, in accordance with the current regulatory and technical documents, to create an economically feasible power supply system for the city district, providing the necessary quality of integrated power supply to all consumers and receivers.