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Here we deal with the protection & control principles of high voltage stations. HV Bus Differential Protection is studied along with restrictions due to CT saturation & mis-match and its solution, “Restraint Differential Protection”.

Starting with System Faults and how they affect  Switchyard Configuration & Elements, simple “Differential Protection” is examined along with the mal-operation due to CT saturation and mis-match.

High Voltage Circuit Breakers are examined as to the various Types (Oil, Vacuum, Air Blast, SF6), their Controls (Closing/Tripping/anti-pumping) Reclosure Syncrocheck relay CUH 90 – VG, as well as Breakers Failure Protection, is part of this module along with a quick look at Dynamic Monitoring Equipment. We also look at transfer & remote tripping and the need to provide immunity from ground rise potential and open circuit situations.

What you will learn:

• System Faults
• Switchyard Configuration & Elements
• The DESN Station (Duel Element Spot Network)
• HV Bus Differential Protection
• CT Saturation & Mal-operation of Bus Protection
• CT Saturation & Restraint Differential Protection
• Westinghouse KD - 4 Relay
• Surge Protective Devices
• Fuses; DC Protection
• Logic Differential Protection
• The Modern IED Relays (Intelligent Electronic Device)
• Overview HV Circuit Breaker Types (Oil, Vacuum, Air Blast, SF6)
• HV Circuit Breaker Controls (Closing & Tripping)
• HV Circuit Breakers; 
• Reclosing (Syncrocheck CUH 90 – VG Relay)
• Dynamic Monitoring Equipment (DME)
• Impedance Relaying (POTT)