Andijon mashinasozlik instituti mualliflar: Maxsudov Moxirbek Tolibjonovich Abdurashidov Eldorbek Ergashboy o‘g‘li

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TABLE OF CONTENTS 
Introduction……………………………………… …………………..…... 3 
MODULE 1. INTRODUCTION TO ELECTRICAL SUPPLY 
SYSTEM INSTALLATION AND OPERATION 
1 Organization of electrical installation works 
1.1 Introduction. General principles of electrical installation works. 
Organization of electrical installation work...…………………….……….4 
1.2 Planning electrical installation work. Preparing to perform electrical 
installation work………………………………………...…………………7 
1.3 Mechanization and industrialization of electrical assembly 
works………………………………………………………………………8 
1.4. Preparation for electrical installation work…………………………..10 
1.5. Mechanization and industrialization of electrical assembly 
work……………………………………………………………………....12 
2 Installation of overhead power lines. 
2.1 Information about air lines…………………………………..………..17 
2.2 Assignment of overhead lines. By intensity……….……………...….18 
2.3 Preparation of overhead lines for assembly…………..………………19 
2.4 Preparation of pit, foundation and supports....……….……………….19 
MODULE 2. ASSEMBLY OF CONDUCTIVE PARTS AND THEIR 
OPERATION 
3 Installation of cable lines up to voltage up to 35 kV. 
3.1 Information about power cables. Power cable types……………...….37 
3.2 Preparation of cables for assembly……………………...………..…..39 
3.3 Placement of cables in earthen tunnels. Laying cables without 
trenches………………………………………………………….….…….41 
3.4 Placement of cables in trays and boxes. Placing cables on steel 
ropes ……………………………………………………………………...47 
MODULE 3. ASSEMBLY OF TRANSFORMERS AND THEIR 
OPERATION 
4 Installation of power transformers 
4.1 General information about transformers. Preparation work………….59 
4.2 Storage of transformers and parts before assembly. Transformer 
assembly………………………………………………………………….62 
4.3 Installation of transformer cooling system and individual parts..........65 
5 Installation of substation switching devices 
5.1 Separators. Splitter and short connectors..............................................71 
5.2 General information about load breakers……….…………………....77 
5.3 Installation of load breakers. General information about low-oil circuit 
breakers…………………………………………………………………...78 

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5.4 Installation of small oil circuit breakers. General information about 
electric circuit breakers………………...…………………………….…...82 
5.5 Installation of electrical circuit breakers. Information about the 
operation of circuit breakers……………………………………..……….83 
5.6 Requirements for circuit breakers. Adjustment of the simultaneous 
connection 
and 
disconnection 
of 
circuit 
breaker 
contacts 
……………………………………………………………………………85 
6 Installation of substation protection and measuring transformers 
6.1 Measuring transformers…………………………...………………….90 
6.2 Tube dischargers. Screw dischargers…………..…………….………92 
6.3 Nonlinear surge arresters. Concrete reactors………………………...96 

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