Free computer program to draw electrical time curve

Example: A 20A branch breaker egress lighting per NEC must selectively coordinate with all upstream devices. The 20A breaker is in a branch panel that has A of available fault current. To selectively coordinate, only the 20A breaker may trip under this fault - this means that the next upstream device must not trip with A of current prior to the 20A device opening.

The smallest device with an instantaneous trip that will not operate at A including the tolerance band is a A thermal magnetic or a A solid state circuit breaker. That second breaker must in turn coordinate with the next upstream device at the fault current level available at that second breaker, and so on, up to and including service entrance overcurrent device.

When the system is being powered by the emergency source, the coordination must now be calculated based on the new available fault current, in most cases sources from an emergency generator. If you are an electrical engineer doing protective devices coordination on a daily basis than it makes sense to consider purchasimg a commercial software license and let the program to create selective coordination charts for you. However, if you are doing selective coordination studies occasionaly only, than spending money to purchase an expensive software program may not be feasible.

Time-current curves can also be plotted and selective coordination for any particular application can be verified by using MS Excel. Go to MagicPlot Manual to find out how. Here in the above picture I decided to plot a line graph by entering coordinates. The steps involved are:. The free version is only for personal and educational use only. Few features disabled for free version are: vector image export, custom fit equations, multiple axes, color map plots, batch processing, etc.

Microsoft Mathematics is a free maths software for Windows by Microsoft. You can use this tool to easily plot graphs. On the interface of the calculator, there are two options: Worksheet and Graphing. There are options to make graph for equations and functions, data sets, parametric , and inequality.

You can either plot 2D, 3D, Polar, or Cartesian graph. While making a graph, you can add multiple equations to plot their graph rendering. Select an equation type, then enter values to plot graph. It is a dedicated graphing program with options to plot various graphs.

On the left section of the interface, you will find options to enter functions, relations, parametric curve , and elementary object. You just have to enter the equation you want to plot, then click on Draw to plot the graph. Multiple expressions can be plotted at the same time. Once a graph is plotted, output can be saved in. MathGrapher is another free graphing program. Graphs can be drawn for Functions, data, curve fitting, iteration, matrix, L-system , and cellular automata.

You can enter data to plot graph with after you have selected an option. In case you want to plot graph for a function, select Functions from the dropdown. Then enter the equation in the text box which you have to plot. Multiple functions can be added to get a graphical rendering in the same graph. You can even add values to functions.

Here you can select if you want to draw 2D or 3D graph, set min and max values of coordinates, etc. Click on Draw Graph to render the graph. Functions can be saves as. Its very easy to create a graph in spreadsheet software with the help of formulas. Simply put data in Rows and Columns to plot graph.

You can also generate data for various equations. For example, I have plotted a graph for Sin function. So, I added the values of different angles from 0 to degrees in column a. Now in the column Sin a , I have assigned the formula for Sin of values in a column. When the sin of all angle values are calculated and displayed using the formula, select both columns and go to the Graph Tool. Here I have selected the XY scatter type to plot graph. There are other graphs as well which you can try your hands on.

To calculate values for equations, simply add the formula in a column along with values to plot a graph. Color of render, background, and foreground colors can be changed as well. Save data as. All you have to do is enter values to be plotted in columns. To render the values you can insert formulas and equations in spreadsheet. Then, create a graph exactly like I explained above. Apart from XY scatter, you can also plot various other type of graphs: column, bar, pie, area, line, bubble, net, stock, etc.

Math Mechanixs is a free math tool where you can solve simple or complex mathematical equations and can also plot graphs. The Quick Graph option lets you enter equation, variable, end value, and start value to plot graphs. The available graph types which can be plotted are: plot, line, graph, area, scatter, hilo, candle, polar, radar, and radar filled. You can enter a note and set label points in a graph.

SMath Studio is another good graphing software, which is primarily a math tool. Making a graph here is pretty easy.

Here you can choose to plot 2D and 3D graphs. A workspace is created, where you can enter an equation or function to plot resulting graph. Option to insert text to graph is also available. Graph rendering can be saved as. The interface displays a list of Arithmetic, Matrices, Boolean, Functions, and Programming options to be used in mathematical calculations.

Simple Grapher Plus is a simple math software, which can help you create a graph. To plot a graph, go to the Plot tab. There you can enter either Function, Inequality, Parametric , or 3D curves. You can add more than one function to plot multiple graphs at the same time. Export graph as. Other tools available on this freeware are Calculator, Triangle solver, Integral solver, Derivative solver, Composite function solver , and Fx evaluator.

Math Solver as the name suggests, solves mathematical problems. Enter an equation to solve in the input text box, then click the Insert button. This will inset the equation for evaluation.

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