Bus Bar Protection Question Bank with Answers:
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1. What are the different types of bus-bar arrangements used in substations ? Illustrate your answer with suitable diagrams.
2. What are the different bus-bar arrangements possible in a substation ? Discuss them briefly with application areas.
3. Discuss and compare briefly various bus-bar arrangements in a power system.
4. Discuss why duplicate bus-bar system is used ? With a neat sketch develop the duplicate bus-bar system and explain why bus-coupler circuit breaker is used ?
5. Describe with neat line diagrams the principle of operation of duplicate bus-bar system in a substation. Explain with a neat diagram how it differs from a transfer bus-bar system.
6. What is the necessity of bus-bar protection ? How the bus-bar protection scheme is stabilised ?
7. Describe a frame leakage protection applicable to metal-clad switchboards.
8. Explain the bus-bar protection scheme with an example. What are the components used in carrier relaying schemes?
9. How is a bus-bar protected ?
10. Explain differential protection of a bus using high impedance relay or linear couplers.
11. Describe the differential bus-bar protection. What are the limitations of this protective scheme and to what extent these can be overcome ?
12. Describe the principle of bus-bar protection based on voltage differential systems. How does it overcome the problems of saturation of CTs ?
13. Write short notes on the following :
- Necessity of bus-bar protection.
- Bus-bar arrangements.
- One-and-a-half breaker arrangement.
- Ring main arrangement of bus-bars.
- Frame leakage or fault-bus protection.
- Voltage differential protection of bus-bars.