Power System Protection
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Posts: 5,361
Joined: Feb 2011
26-02-2011, 02:42 PM

presented by:
Rajesh Sharma

.ppt   Device-Coordination.ppt (Size: 1.32 MB / Downloads: 216)
Power System Protection

 Overcurrent Coordination
A systematic study of current responsive devices in an electrical power system
 To determine the ratings and settings of fuses, breakers, relay, etc.
 To isolate the fault or overloads.
 Economics
 Available Measures of Fault
 Operating Practices
 Previous Experience
 Open only PD upstream of the fault or overload
 Provide satisfactory protection for overloads
 Interrupt SC as rapidly (instantaneously) as possible
 Comply with all applicable standards and codes
 Plot the Time Current Characteristics of different PDs
 New electrical systems
 Plant electrical system expansion/retrofits
 Coordination failure in an existing plant
Protection vs. Coordination
 Coordination is not an exact science
 Compromise between protection and coordination
 Reliability
 Speed
 Performance
 Economics
 Simplicity
 Prevent injury to personnel
 Minimize damage to components
 Quickly isolate the affected portion of the system
 Minimize the magnitude of available short-circuit
Spectrum Of Currents
 Load Current
 Up to 100% of full-load
 115-125% (mild overload)
 Overcurrent
 Abnormal loading condition (Locked-Rotor)
 Fault Current
 Fault condition
 Ten times the full-load current and higher
 Limit the extend and duration of service interruption
 Selective fault isolation
 Provide alternate circuits
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16-04-2012, 11:24 AM

to get information about the topic "power protection system" full report ppt and related topic refer the link bellow



Posts: 45
Joined: Apr 2011
18-04-2012, 05:00 PM

Power System Protection is one of the techniques and methods through which we can save power by decreasing the load

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