iPad Screenshots


Protective relay technician calculator for Symmetrical Components, Apparent Impedance, Phase-Phase calculations, Polar-to-Rectangular conversions and more. The iPad version goes well beyond the iPhone version in that the larger screen allows for more details.
The "In-Depth" pages in the iPad version take you step by step through many calculations like your Symmetrical Components and Phase-Phase calculations.
This is a relay tech calculation tool and an educational refresher tool.

What's New

Version 3.1

Fixed a font issue that caused truncations on the data fields with iOS upgrade to iOS 9.
Otherwise this is the same great app as before.
Calculators for Symmetrical Components, Phase-Phase values, Apparent Impedance, Vector Addition, Vector Subtraction, P-Q-S Calculations, Polar Coordinates to Rectangular Coordinates Conversion, Rectangular Coordinates to Polar Coordinates Conversion and more.
There are additional pages to go in-depth on Pythagorean Theorem, Mho Circle Calculations, Horizontal Characteristic Calculations, "V0 without I0 issues" and more.
There is an entire section on my RELAYS BY THE NUMBERS that has numerical simulations of various relays such as IEEE Devices 21, 40, 46, 47, 59, 50, 87T and more.
This is an entire relay tech apprenticeship in an app.
Use it as an everyday relay tech calculator or use it as a training aid.

Ratings and Reviews

LAF 1974

Must Buy

Incredible and useful tool for this industry.


Great tool

This is a great symmetrical components calculator and a very useful tool for testing protective relays. Highly recommended!


Merle Ashton
5.3 MB
Requires iOS 7.0 or later. Compatible with iPad.
Age Rating
Rated 4+
© Merle E. Ashton


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