Free Electrical Engineering Calculator for Windows: OBphasor
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Free Electrical Engineering Calculator for Windows: OBphasor

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OBphasor is a free electrical engineering calculator software program for Home windows. It helps you to calculate electrical equations containing complicated numbers. In electrical engineering, for DC present circuits, voltage, resistance, and present are scalar portions, so their calculation may be accomplished with easy calculators. However on the subject of AC present circuits, voltage, present, and impedance (resistance) have alternate instructions and posses different dimensions for amplitude (frequency and part shift). So in an effort to characterize these multi-dimensional portions, it’s worthwhile to use complicated numbers with actual and imaginary elements. Easy calculators can’t carryout calculations of complicated numbers. In such scenario, Obphasor can come helpful, as it might calculate issues with complicated numbers for you.

This software program instantly makes use of widespread mathematical operations of “+”, “-“, “*” and “/” with complicated portions. It breaks complicated equation into easy steps to do the required calculation. OBphasor helps you to use 4 conversion choices: (a, b), (module, angle), (module, cosFi)→(a, b), and L,C→Z. You can even calculate the conjugate for any Enter Output (a, b). This helps electrical engineers to calculate electrical equations with actual and imaginary elements very simply.


Let’s see how this works.

Methods to use this Free Electrical Engineering Calculator For Home windows:

OBphasor is a transportable electrical engineering calculator for Home windows, so that you don’t actually have to put in this software program. You simply must extract the zip file you’ve gotten downloaded and run the executable file of OBphasor. On operating this software program, its interface instantly pops out. Right here, it’s worthwhile to enter the true and imaginary elements of equations it’s worthwhile to work on.

Allow us to take a easy instance first to grasp how this Electrical calculator works:

As you understand V=I*Z, the place V is voltage, I is present, and Z is impedance.

Lets suppose the Voltage in an AC circuit is 42 + j12 Volts and Impedance is 3.5 + j4.2 Ohms. Then what’s the worth of Present?

V = I*Z

V = 42 + j12 (volts)→object A

Z= 3.5 + j4.2 (ohm)→object B

I = V/Z (amps)→object C

Fill the values of V and Z in any of the row in RE and IM columns. Actual half goes in RE column, whereas the imaginary half with j goes in IM column. Every equation is represented by the row’s identify. Right here V is A, whereas Z is B. Now enter the connection in C and click on RUN. You’re going to get the worth of I in actual and imaginary half in RE and IM columns of C.


I= 6.642 – j4.4965 amps

Now lets take an instance of extra complicated calculation of Earth-Return Compensation Issue (K0) for an Electrical Energy line:

Suppose you understand the worth of each the impedance, optimistic sequence (Z1) and 0 sequence (Z0) for an electrical energy line:

Z0 = 22.12 + j98.16 (Ohm)→object A

Z1 = 09.40 + j28.15 (Ohm)→object B

Fill the values of Z0 and Z1 as within the first instance.

obphasor_a and b_8-7-16

We have to calculate K0, that’s Earth return compensation issue: K0 = (Z0 – Z1) / (Z1 * 3).

Since OBphasor can solely use one mathematical operation at a time, you have to to have endurance and remedy the above equation in steps. Now we divide the above equation for K0 in following Three elements.

  • Z0 - Z1 = A-B → object C
  • Z1 * 3 = B*Three b →object D
  • K0 = (Z0 - Z1) / (Z1 * 3) = C/D →object E

Now, enter the connection within the columns one after the other. Enter the connection for row C, then click on on Run. Do the identical for subsequent 2 steps to succeed in the ultimate worth of K0. So easy, isn’t it?

obphasor_c,d, and e_8-7-16

The phasor type of K0 obtained is 0.7911 – j0.1135.

So as to convert this phasor type of K0 (a,b) to (module, angle), it’s worthwhile to paste the worth of K0 to enter output panel, then click on on (module, angle) choice. And, this offers you the worth of K0 in module and angle.

K0 = 0.7992 /_8.1646 deg.


There are two extra conversion choice out there with OBphasor named: (module, cosFi)→(a,b) and L,C→Z.

OBphasor additionally has the choice to save lots of a calculation as .mc file on laptop. There’s additionally an choice to save lots of the calculation as a PDF file for printing function. On utilizing this selection, the screenshot of OBphasor’s interface with the calculations will get saved as a PDF file. There’s an choice to conjugate enter output for (a, b).


It is a nice desktop electrical engineering calculator software program for electrical engineers. It does nicely with its job to calculate complicated numbers with actual and imaginary elements. The method to make use of OBphasor is a bit gradual, because it performs one motion at a time. However on the brilliant aspect, it helps you to save entire calculation for future references. I’ll advocate this to each electrical engineer.

Get it from here.