Curves for thermal relay

[Lateralus]

How can I create in Labview this kind of curves?

 

[santo_13]

This graph seems to use non evenly spaced grids. Native Graphs in LabVIEW are always evenly arranged.

Of course, you can plot this data in LabVIEW but it will not be exactly like this.

[didje007]

This looks like a logarithmic scale, I only have the french version of Labview installed so U can't tell you the exact words, but you need to select the graph, go to properties and select scale, then you will have a check box to make the scale logarithmic....

[Henrik_Volkers]

Both scales are log,

x in current and y in seconds

to get the grid exactly like you want have a look at the advanced plotting toolkit

maybe it can be done with the native graph and properties .... the marker values property is your friend... however how to force different unit sec /min ???

here is a try

set the timescale to relative time ... but that will switch to hours in the upper end 😉

Now you have to fill it xy data 🙂

For documents you finally use something like inkscape to do the fine tuning 😄  

[santo_13]

Indeed this is a log scale graph, I did not recognize this as a zoomed-in log scale, have been thinking about log markers in decade values.

Henrik Volkers' solution seems to match the graph OP shared.

[Lateralus]

Hello,

Thanks for your great helping and support.

But unfortunately I don´t no how I can set the points in the graph ☹.

The Labview user "Test Engineer" should set the points in the LV graph regarding the overload protection relay curves. (Only one curve cold or warm).

Example the Motor current is In=4A and the overload protection relay is adjusted to 4A.

After that the test engineer set manually the high-current transformer to 16A (Test current 4xIn=16A). 

The current value is measuring via TCP/IP and an ABB EkipUp devices. This works fine.

The current and the time is measured until the overload relay is tripped. Compare the trip time with the curve and Test passed or not. The electronic overload relay must trip within the time ± 15 % in the curve line. Attached a curve with real measured current value and time until a trip approx. 2500A. Measured with a Power Quality Analysers CSV Data. Graph created with gnuplot.

Last but not least create a Testreport and than it´s finish.

This is my big challenge.

I need a professional Labview expert to get maybe in contact via Teams etc.

Best Regards

[Henrik_Volkers]

Professional Help can be requested in the Job part of this forum

https://forums.ni.com/t5/LabVIEW-Job-Openings/bd-p/JobPost

here you get hints how to help yourself if you are stuck, reading the help of the xy graph on how to feed it , or check the provided examples , is your homework

show your code and we usually can help you to get it run (and how to improve it)

[santo_13]

From the way you described your requirement, it seems like you have little idea of the magnitude of work involved to get it done. So you're looking to hire someone to do this "Project" for you and not specifically do this yourself.

You can post your requirement in the Job Openings board for a freelancer as shared by Henrik or reach out to one of your local alliance partners to discuss further.