1. 1 substation load and statistics 1

1.2 Selection of main transformer 4

Chapter II Main Wiring Design 5

2. 1 design principle of main electrical wiring 5

2.2 Basic requirements for main wiring design 5

2.3 Comparison and Determination of Design Schemes for Electrical Main Wiring 6

Chapter III Calculation of Short-circuit Current 13

3. 1 Basic knowledge of short circuit 13

3. 1. 1 cause of short circuit fault 13

3. 1.2 Hazard of short circuit fault 14

3.2 Purpose of calculating short-circuit current 15

3.3 Calculation of short-circuit current 15

Chapter IV Selection and Calibration of Equipment 16

4. 1 General conditions for electrical selection 16

4.2 Press short circuit check 16.

4.3 Selection of Circuit Breaker 17

4.4 Selection of disconnector 17

4.5 Selection of Transformer 17

4.6 bus selection 18

4.7 electrical equipment selection list 20

The fifth chapter relay protection configuration 2 1

5. 1 Basic knowledge of relay protection 2 1

5.2 2 1 line relay protection configuration

5.3 Relay protection of transformer 22

5.4 Setting of standby automatic switching and automatic reclosing 23

Chapter VI Design of Distribution Equipment 25

6. 1 Design requirements of power distribution equipment

5.2 Selection and arrangement of power distribution equipment 26

Main references 27

Thanks 28

Appendix 1 Calculation Table 29

(1) electrical primary part 29

1. 1 load statistics 29

1.2 short-circuit current calculation 3 1

1.3 conductor selection and inspection 34

1.4 Selection of circuit breakers and disconnectors 37

Select 1.5 transformer 4 1

(II) Electrical Secondary Part 44

1.1.1.10 kv line relay protection setting 44

1.2 10kV line relay protection setting 45

1.3 transformer relay protection setting 46

1.4 transformer protection circuit design 49

Appendix 2 Electrical Main Wiring Diagram

Appendix 3 Electrical General Layout

Appendix 4 1 10kV distribution equipment layout

Appendix 5 10kV Distribution Equipment Layout

Appendix 6 Transformer Protection Circuit Diagram