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Free Downloadable Resources

Download our free protection and control resources, including PDF guides, Excel spreadsheets, and more!

Protection and Control Fundamentals PDF

Download our free power system protection fundamentals text-based course, where we cover all the fundamentals about power system protection.

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Mho Element Plotter

Download our free mho element plotter for SEL-421 protective relays. With this spreadsheet, you can plot two distance protection zones, as well as the load encroachment function.

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SEL and IEEE Inverse-Time Overcurrent Plotter

Download our free inverse-time overcurrent plotter. With this spreadsheet, you can plot SEL "U" and IEEE standard overcurrent curves.

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Loss-of-Field Element Plotter

Download our loss-of-field element plotter for SEL-300G relays. With this spreadsheet, you can calculate the loss-of-field settings using generator nameplate information and plot the elements in an RX plot.

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87 Tap Calculator

Download our phase differential tap calculator. With this spreadsheet, you can calculate the tap settings for the transformer phase differential element in an SEL-487E relay.

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POTT Scheme Plotter

Download our POTT scheme plotter for SEL 400 series relays. With this spreadsheet, you can plot the local and remote Zone 2 elements used in a POTT scheme to visualize the overlap of the communications-assisted scheme.

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Symmetrical Components Calculator

Download our symmetrical components calculator. With this spreadsheet, you can convert phase components to sequence components and vice versa.

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Free Protection and Control Videos

Check out some of the videos below from our YouTube channel!

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Online Courses

Continue learning about power engineering and power system protection and control with our online courses. Sign up to one of our subscriptions to get access to all courses!

Subscription (Annual)

Save 20% over the monthly subscription and enjoy access to all courses offered by Romero Engineering Co. with this annual subscription.

$468.00 USD every year

Subscription (Monthly)

Enjoy access to all courses offered by Romero Engineering Co. with this monthly subscription.

$49.00 USD every month

Protection and Control Training

Learn about specific protection and control topics with this customized one-hour one-on-one virtual training session with Ricardo Romero, PE.

$199.00 USD

Power System Analysis Course

Learn about power systems with this one-time purchase. You'll have lifetime access to this course on desktop and mobile devices upon purchase.

$199.00 USD

Power System Protection: Protective Relay Logic Course

Learn about digital logic in protective relays with this one-time purchase. You'll have lifetime access to this course on desktop and mobile devices upon purchase.

$149.00 USD

Power System Protection: Busbar Protection Course

Learn about bus differential protection with this one-time purchase. You'll have lifetime access to this course on desktop and mobile devices upon purchase.

$149.00 USD

Power System Protection: Transformer Protection Course

Learn about power transformer protection with this one-time purchase. You'll have lifetime access to this course on desktop and mobile devices upon purchase.

$149.00 USD

Symmetrical Components for Power System Protection Engineers Course

Learn about symmetrical components and power system protection with this one-time purchase. You'll have lifetime access to this course on desktop and mobile devices upon purchase.

$149.00 USD

MATLAB/Simulink for Power System Simulations Course

Learn about power system software simulations with this one-time purchase. You'll have lifetime access to this course on desktop and mobile devices upon purchase.

$149.00 USD