About Switchgear And Protection
Switchgear and Protection is a free Electrical Engineering handbook covering important course topics, detailed notes, diagrams, equations, formulas and study materials. Use this digital book and reference guide for...
Switchgear and Protection is a free Electrical Engineering handbook covering important course topics, detailed notes, diagrams, equations, formulas and study materials. Use this digital book and reference guide for Diploma, BE, BTech and related engineering degree courses.
Explore 152 topics across 9 chapters on protective relaying, power system faults, instrument transformers, circuit breaker tripping schemes, electromagnetic relays, differential protection, busbar protection and static relays. Useful for university exams, GATE revision, viva, interviews, assignments and quick reference.
RELATED ENGINEERING BRANCHES
Electrical Engineering, Electrical and Electronics Engineering (EEE), Power Systems Engineering, Power Engineering, Electronics Engineering and Instrumentation Engineering.
46 LISTED TOPICS FROM 152
PROTECTIVE RELAYING & POWER SYSTEM FAULTS
1. Functions of Protective Relaying
2. Protection Zones
3. Primary and Backup Protection
4. Concept of Backup Relaying
5. Methods of Backup Protection
6. Nature and Causes of Faults
7. Fault Current Calculation Using Symmetrical Components
8. Relay Qualities: Reliability, Selectivity and Discrimination
9. Relay Qualities: Speed, Operating Time and Sensitivity
10. Relay Qualities: Stability, Adequacy, Simplicity and Economy
11. Classification of Protective Relays
12. Protective Relaying Terminology
INSTRUMENT TRANSFORMERS & TRIPPING
13. Instrument Transformers
14. Circuit Breaker Tripping: Relay with Make-Type Contact
15. Working Principle of Current Transformers (CT)
16. Wound-Type Current Transformer Construction
17. Bar-Type Current Transformer Construction
18. Potential Transformer (PT) Construction
19. Current Transformer vs Power Transformer
20. Instrument Transformer Ratio Error
21. Instrument Transformer Phase-Angle Error
22. Reduction of Ratio and Phase-Angle Errors
23. Advantages and Disadvantages of Instrument Transformers
ELECTROMAGNETIC & DIRECTIONAL RELAYS
24. Introduction to Electromagnetic Relays
25. Circuit Breaker Tripping: Relay with Break-Type Contact
26. Attracted-Armature Electromagnetic Relay
27. Solenoid-and-Plunger Electromagnetic Relay
28. Operating Principles of Electromagnetic Attraction Relays
29. Advantages, Limitations and Applications of Electromagnetic Relays
30. Directional Power Relay
31. Directional Induction-Type Overcurrent Relay
32. Operation of Directional Induction-Type Overcurrent Relay
33. Directional Characteristics of Induction-Type Overcurrent Relays
DIFFERENTIAL & BUSBAR PROTECTION
34. Introduction to Differential Relays
35. Current Differential Relay
36. Percentage Differential Relay
37. Voltage Balance Differential Relay
38. Busbar Protection: Faults and Challenges
39. Frame Leakage Protection of Busbars
40. Circulating Current Protection of Busbars
41. High-Impedance Differential Protection of Busbars
THERMAL & STATIC RELAYS
42. Thermal Relays
43. Basic Elements of a Static Relay
44. Measuring Element in a Static Relay
45. Static vs Electromagnetic Relays and Advantages of Static Relays
46. Limitations and Semiconductor Devices Used in Static Relays
APP FEATURES
• Chapter-wise engineering notes and course material
• Diagrams, formulas and mobile-optimized illustrations
• Comfortable reading mode and simple navigation
• Quick revision for exams and technical interviews
Use this free Switchgear and Protection ebook to revise protective relays, CTs and PTs, fault calculations, circuit breaker control and electrical power system protection.
Previous Versions
Here you can find the changelog of Switchgear And Protection since it was posted on our website on 2016-10-03 22:05:17.
The latest version is 16.0 and it was updated on 2026-10-16 07:35:43. See below the changes in each version.
Switchgear And Protection version 16.0
Updated At: 2026-10-07
Changes: ✨ **What’s New**
• Added Premium Purchase option for an enhanced, ad-free experience.
• Improved app stability and performance.
• Fixed minor bugs and improved overall user experience.
• General improvements and optimizations.
Switchgear And Protection version 15.0
Updated At: 2025-08-26
Switchgear And Protection version 1.8
Updated At: 2023-02-26
Changes: New Data Added..
Switchgear And Protection version 1.7
Updated At: 2021-05-18
Changes: Added new data and working smoothly..
Switchgear And Protection version 1.2
Updated At: 2016-11-08
Changes: Lighter And Faster...
Material UI Design..
Bug Fixes..
