Possible Relaying Schemes

• Differential– General Electric TTS– Schweitzer 387

• Distance– General Electric - D60– Schweitzer 321

• Overcurrent– General Electric MDP– Schweitzer 387

• Directional– General Electric ALPS– Schweitzer 321

Design Team 15

Team Members Advisors

• Caleb Emmes• Thomas Carpenter• Steve Stec• Jason Sundquist• Tim Grunlund• Kevin Vicklund

• 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

Protection Against

• Overheating Low oil levels

• Sudden pressure changes

• Overcurrent

• Faults on the surrounding lines

• Transformer internal faults

• Low nitrogen pressure

Transformer Specifications

• 300/400/500 MVA

• 345/138 kV - 13.8 kV tertiary

• Wye-primary and secondary

• Delta-tertiary