RELAYS 101 iPH by Merle Ashton (iPhone)
Released: Dec 26, 2013
Version: 4.2
Size: 2 MB
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Ranking - Utilities (iPhone)


Merle Ashton
Protective Relay Technician Calculator for iPhone. All of the calculations of the RELAYS 101 for iPad version just missing the phasor drawings to fit the smaller iPhone screens. Symmetrical Components, Apparent Impedance, Phase-Phase calculations and vector addition and subtraction are now at your finger tips.
There are also pages to help you set-up relay tests for Phase-to-Phase faults (with no V0 and no I0), Phase-Ground fault relay tests and 3-Phase fault relay tests. There is a page for up to 6 vector additions (help you add Bus Diff phasors) and a PQS calculations page. An amazing amount of information in this APP. Your iPhone is now an essential tool for your relay testing tool box.

What's new in version 4.2
Besides updating for the latest iOS release we had to fix a calculation label.
The calculation was correct but the displayed calculation was wrong.
On the Phase-Ground Fault Relay Test pages we had displayed "Iflt = Vflt / ZFlt * (1 + k0)"; this calculation works under very limited circumstances.
We replaced the displayed calculation with the more correct "IFlt = VFlt / (ZFlt + k0ZFlt)".
Screenshot #1
Our verdict: Meh!
  • = RELAYS 101 iPH has no ratings yet.
  • + It is currently 50% off its regular price.
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