In this design, the selection of main transformer, the demonstration of electrical main wiring diagram scheme, the calculation of short-circuit current, and the selection of main electrical equipment (including current transformer and voltage transformer, etc.). ), introduces the protection configuration and setting calculation of main transformer and line, as well as relay protection and other related knowledge.
This design is mainly about the design of relay protection for 220kV substation, from the selection of main transformer and the connection mode of each voltage level to the calculation of short-circuit current, the setting calculation of main transformer protection and the selection of equipment. In addition, I also completed the design of the main transformer protection diagram, protection configuration diagram and voltage transformer secondary diagram.
Substation, main wiring, short-circuit current, relay protection
catalogue
Abstract 1
Abstract 1
1 Introduction 1
1. 1 the significance of this topic 1
1.2 Main work of this paper 2
2 Location of Substation and Selection of Transformer 3
2. 1 Selection of location and type of substation 3
2.2 Selection of main transformer 4
3 Selection of main electrical wiring 7
3. 1 Main wiring design requirements and principles 7
3.2Design of Main Wiring for No.9 Substation
3.3 Overview of this chapter 12
4 calculation of short-circuit current 13
4. 1 short circuit current calculation conditions 13
4.2 Short-circuit current calculation 15
4.3 Summary of this chapter 2 1
5 Selection and configuration of current and voltage transformers 22
Selection and configuration of current transformer 22
5.2 Selection of Voltage Transformer 26
5.3 Overview of this chapter 29
6 Substation Relay Protection Design 30
6. 1 Design principles of relay protection 30
6.2 Protection of Power Transformer 34
6.3 Substation Line Protection Design 44
6.4 Overview of this chapter 49
7 Conclusion 50
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