555122014 - HAMDARD UNIVERSITY BANGLADESH NAME MD MAMUN...

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HAMDARD UNIVERSITY BANGLADESH NAME : MD. MAMUN AHMED COURSE TITLE: POWER SYSTEM II ID :555122014 COURSE CODE : EEE705 DEPT .OF EEE COURSE TEACHER : SHAWON AHMED 1 ST BATCH 8 TH SEMESTER LECTURER DEPT. OF EEE 4/15/16
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Welcome to this Presentation 4/15/16 2
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Presentation Topic : Differential Protection of Alternator and generator Presentation Objectives: Protection of alternator, Differential protection of alternator, Modified differential protection for alternator,Balanced earth-fault protection, Stator inter-turn protection 4/15/16 2 3
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Protection of alternators 1.Failure of prime mover 2.Failure of field 3.Overcurrent 4.Overspeed 5.Overvoltage 6.Unbalenched loading 7.Stator winding faults 4/15/16 2 4
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Differential Protection of Alternator Fig 1: Differential protection of 3 phase alternator 4/15/16 2 5
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Limitation
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Unformatted text preview: The two circuits for alternator protection shown above have their own limitations. It is a general practice to use neutral Earthing resistance in order to to limit the destructive eFects of earth-faults currents. In such situation it is impossible to protect whole of the stator windings of a star connected alternator during earth faults. When an earth fault occurs near the natural point there may be insu±cient voltage across the short circuited portion to derive the necessary current round the fault circuit to operate the relay. 4/15/16 7 2 Modifed diFerential protection ±or alternator 4/15/16 2 8 Balanced earth protection 4/15/16 2 9 Stator inter-turn protection 4/15/16 2 10 Thanks for your kind Attention Allah Hafez 4/15/16 11 2...
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  • Spring '16
  • The Circuit, differential protection, Stator inter-turn protection, Modified differential protection

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