07-01-2011, 05:16 PM
BUSBAR PROTECTION.ppt (Size: 731.5 KB / Downloads: 883)
satish das
CONTENTS
What is a bus bar?
Causes of fault
Suitable protection
Selection of CT ratios
Behaviour of protective CT (saturated CT)
Types of faults
Overcoming the faults
Stability Ratio
Conclusion
References
What is a bus bar?
Bus derived from Latin word
omnibus
(common for all)
Nerve centre of the power system
Causes of fault
Breakdown of insulation because of over voltages
Weakening of insulation because of ageing
Corrosion
Failure of connected equipment
Suitable Protection
Differential protection
Why differential protection?
Terminals of the system near to each other
Installation of CTs
Easy comparison of current entering and leaving
Fault detection