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Possible Relaying Schemes • Differential – General Electric TTS – Schweitzer 387 • Overcurrent – General Electric MDP – Schweitzer 387 • Distance – General Electric - D60 – Schweitzer 321 • Directional – General Electric ALPS – Schweitzer 321 Design Team 15 Team Members • • • • • • Caleb Emmes Thomas Carpenter Steve Stec Jason Sundquist Tim Grunlund Kevin Vicklund Advisors • Faculty – Dr. Bruce Mork • Consumers Energy – John Zipp – John Larson – Rich Cottrell Project Definition Design an economic and efficient relay protection scheme for a 345/138 kV 300/400/500 MVA transformer and surrounding transmission lines. Microprocessor Relays • There are several brands of relays which may be used to protect the power system. Microprocessor relays are designed to monitor several electrical inputs simultaneously and decide whether to send a “trip” signal to active breakers or reclosers.. • There are many microprocessor manufacturers... – Schweitzer – General Electric – ABB – Basler Voltage and Current Transformers •Used to breakdown voltages and currents that the relays are designed to operate with Transformer Relay Protection Sponsored By: Consumer’s Energy Computer (CAPE) Fault Simulation Using the computer to simulate faults within our system and using this data to apply our relay settings. Project Motivation • • • • Transformer Specifications 300/400/500 MVA 345/138 kV - 13.8 kV tertiary Wye-primary and secondary Delta-tertiary • • • • • • Protection Against Overheating Low oil levels Sudden pressure changes Overcurrent Faults on the surrounding lines Transformer internal faults Low nitrogen pressure