Russ' Mathcad examples (developed in version
2001i)
Filename 
File description 
Example of calculating the discrete (digital) fourier transform on one cycle of 


a waveform by formula. Here is similar analysis done in Excel using Analysis Toolpak. Here is similar code for doing dft in VB. 
Applying the dft in a "sliding window" along a waveform greater than one cycle 


in length. 
Applying the sliding window dft to an actual waveform captured by a micro 


processor protective relay during the energization of a 1300MVA, 500kV 

power transformer bank. The waveform is bphase current as measured from 

the 500kV side (bank energized from 500kV side). The worksheet reads 

the waveform in from a COMTRADE data file. Bank is Ynyd connected. 
Example of calculating the rootmeansquare (RMS) value of one cycle of a 


waveform by formula. 
Applying the rms calculation in a sliding window along a waveform greater 


than one cycle in length. 
Applying the sliding window rms calculation to the actual waveform described 


above in the "actual_dft.mcd" description. 
The discrete convolution of two number sequences. Here is an animation 


of the convolution, discrete_convolution.avi 


Zip file with the *.MCD files used to create above described web presentations. 



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