CHAPTER 6: SETPOINTS S3 PROTECTION
350 FEEDER PROTECTION SYSTEM – INSTRUCTION MANUAL 6–53
S3 Protection
The 350 protection elements are organized in two identical setpoint groups: Setpoint
Group 1 and Setpoint Group 2.
Each Setpoint Group has the same protection functions, depending on the relay order
code. These protection functions include:
• Phase Timed Overcurrent (Phase TOC)
• Phase Instantaneous Overcurrent (Phase IOC)
• Ground Timed Overcurrent (Ground TOC)
• Ground Instantaneous Overcurrent (Ground IOC1, Ground IOC2)
• Ground Directional(Ground Dir)
• Neutral Timed Overcurrent (Neutral TOC)
• Neutral Instantaneous Overcurrent (Neutral IOC1, Neutral IOC2)
• Neutral Directional(Neutral Dir)
• Negative Sequence Overcurrent (Negative Seq OC)
• Phase Undervoltage (Phase UV)
• Phase Overvoltage (Phase OV)
• Neutral Overvoltage (Neutral OV)
• Negative Sequence Overvoltage (Negative Seq OV)
• Auxiliary Undervoltage (Auxiliary UV)
• Auxiliary Overvoltage (Auxiliary OV)
• Underfrequency 1, Underfrequency 2
• Overfrequency 1, Overfrequency 2
• Thermal Model
Courtesy of NationalSwitchgear.com
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