In these articles, I have discussed the methodology on how to create time-current curves using excel.

  1. Creating Coordination Curves with Excel
  2. Time-Current Curves with Excel II
  3. Time-Current Curves with Excel III
  4. Time-Current Curves with Excel IV

I would suggest that if you are not familiar with creating graphs in excel that you go to each of the tutorials listed above to be able to comprehend the foregoing how tos.

In this series of tutorials, I will be discussing "HOW TOS" on relay coordination using excel. In each part of the tutorial, a methodology will be presented step-by-step.

It is expected that after the completed of the whole series of tutorials, readers will be able to demonstrate their acquired in relay coordination using excel.


  • A Filipino Engineer, Registered Professional Engineer of Queensland (RPEQ) - Australia, and Professional Electrical Engineer (PEE 2574 - 1st Place April 1991) - Philippines with extensive experience in concept selection, front-end engineering, HV & LV detail design, construction, and commissioning of Hazardous and Non-Hazardous Area electrical installations in water and wastewater pipeline and pumping facilities, offshore platforms, hydrocarbon process plants and pipelines including related facilities. Hazardous area classification and design certification (UEENEEM015B, UEENEEM016B, UEENEEM017B).