why there is no change in the direction of fault current in radial system
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I presume you are talking about negative sequence currents that occur during fault.
Current doesn't actually flow backwards. Negative sequence currents are just components of the fault current which arise due to the imbalance in generator parameters during fault.
If you are not taking about negative sequence currents then,
The only possible condition when currents flows backwards is in the case of line to line faults.
Assuming phases B &C are at fault, line current in phase B will the the negative of the line current at phase C (because phases B&C form a closed circuit)
The net fault current will be given by the formula
i= -j√3 * Ea/(Z1+Z2)
Where i is fault current, j is √-1 , Ea is generator emf , Z1& Z2 are positive and negative sequence impedances.
THIS IS THE ONLY CASE WHERE CURRENT FLOWS BACKWARDS (REVERSE) DURING A FAULT
hope I have answered your question
Current doesn't actually flow backwards. Negative sequence currents are just components of the fault current which arise due to the imbalance in generator parameters during fault.
If you are not taking about negative sequence currents then,
The only possible condition when currents flows backwards is in the case of line to line faults.
Assuming phases B &C are at fault, line current in phase B will the the negative of the line current at phase C (because phases B&C form a closed circuit)
The net fault current will be given by the formula
i= -j√3 * Ea/(Z1+Z2)
Where i is fault current, j is √-1 , Ea is generator emf , Z1& Z2 are positive and negative sequence impedances.
THIS IS THE ONLY CASE WHERE CURRENT FLOWS BACKWARDS (REVERSE) DURING A FAULT
hope I have answered your question
harsh3374chauhan:
hope it helped
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