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Generator protection

Various Generator protection Schemes, ,generator protection ,rotor faults ,stator faults ,low impedance grounding ,high impedance grounding ,field ground fault protection ,negative sequence time overcurrent relay ,generator capability curve

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Generator protection

  1. 1.  ROTOR ELECTRICAL FAULTS  LOSS OF EXCITATION  LOSS OF SYNCHRONISM  FAILURE OF PRIME MOVER  LUBRICATION OIL FAILURE  OVER SPEEDING  CORE LAMINATION FAILURE
  2. 2.  STATOR ELECTRICAL FAULTS  OVER LOADS  OVER VOLTAGE  UN BALANCED LOADING  OVER FLUXING
  3. 3. 6 BASIC SYNCHRONOUS GENERATOR GENERATOR PROTECTION
  4. 4. 7 1.ARMATURE WINDING- STATOR 2.FIELD WINDING-ROTOR. RELATIVE MOTION BETWEEN THESE TWO WHICH IS ACHIEVED BY THE 3.Prime Mover-TURBINE.
  5. 5.  Capacity – 247MVA  Stator Voltage – 15KV/15.75KV)  Stator current – 9060 Amps  Rotor Voltage – 310V  Rotor Current – 2600Amps.  Frequency – 50 Hz. Speed –3000RPM
  6. 6.  Capacity – 222MVA  Stator Voltage – 13.8  Stator current – 9297 Amps  Rotor Voltage – 336V  Rotor Current – 2180Amps.  Frequency – 50 Hz. Speed –136RPM
  7. 7. N = 120F/P N – Rotational Speed RPM F - Frequency Hz P – Number of Poles
  8. 8. 11 SYNCHRONOUS GENERATOR TYPES GENERATOR PROTECTION
  9. 9. 12 TYPICAL UNIT GENERATOR – TRANSFORMER CONFIGURATION
  10. 10. 13 Device Function 21 Distance Relay. Backup for system and generator zone phase faults. 24 Volts/Hz protection for generator over excitation. 32 Reverse power relay. Anti- motoring protection. 40 Loss-of-field protection. 46 Negative sequence unbalance current protection for the generator. ANSI DEVICE NUMBERS
  11. 11. 14 Device Function 49 Stator Thermal Protection. 51GN Time over current ground relay. 51TN Backup for ground faults. 51V Voltage-controlled or voltage- restrained time over current relay. Backup for system and generator phase faults. 59 Overvoltage protection. 59GN Overvoltage relay. Stator ground fault protection for a generator. ANSI DEVICE NUMBERS
  12. 12. 15 Device Function 78 Loss-of-synchronism protection. 81 Frequency relay. Both underfrequency protection. 86 Hand-reset lockout auxiliary relay. 87G Differential relay. Primary phase- fault protection for the generator. 87N Stator ground fault differential . 87T Differential relay. Primary protection for the transformer. 87U Differential relay for overall generator and transformer protection. ANSI DEVICE NUMBERS
  13. 13. 16 LOW IMPEDANCE GROUNDING GENERATOR PROTECTION
  14. 14. 17 HIGH IMPEDANCE GROUNDING GENERATOR PROTECTION
  15. 15. 19 NEGATIVE SUENCE RELAYS – BASIC DESIGN
  16. 16. 20 GENERATOR CAPABILITY CURVE LOSS OF FIELD PROTECTION

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Various Generator protection Schemes, ,generator protection ,rotor faults ,stator faults ,low impedance grounding ,high impedance grounding ,field ground fault protection ,negative sequence time overcurrent relay ,generator capability curve

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