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.
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.
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.
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.
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.
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.
Symmetrical Components Calculator
Download our symmetrical components calculator. With this spreadsheet, you can convert phase components to sequence components and vice versa.
Free Protection and Control Videos
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