Answer / ravi

Protection of S.M Above 12 MW:-

The Best Protection method is by SPM:-

Application of SPM Protection:-

• Field application
• DC field current loss, exciter current loss, DC field
voltage
check

• PF regulation, reluctance torque synchronizing
• Protects motor during start up and in the event of
asynchronous operation
• Squirrel cage winding overheating protection
• Automatic phase rotation correction
• Auto-loading and incomplete sequence
• Regulator tuning mode
• True RMS metering with DFT filtering
• Optional power factor regulator with adjustable settings
• Power factor & pull out protection (Optional)
• Speed dependent squirrel cage overload protection
• Motor restart protection

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