Information Needed for Application of Protection Scheme

•- One line diagram and system configuration

•- Impedance and connection of the power equipment, system frequency, system voltage, and system    phase sequence

•- Existing protection and problems

•- Operating procedure and Practices

•- Importance of the system equipment being protected

•- System fault study

•- Maximum loads and system swing limits

•- Current and voltage transformer locations, connections, and ratios

•- Future expansion

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