Filename

File description

dft.mcd

 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.

sliding_dft.mcd

 Applying the dft in a "sliding window" along a waveform greater than one cycle

 in length.

actual_dft.mcd

 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 b-phase 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 Yn-y-d connected.

rms.mcd

 Example of calculating the root-mean-square (RMS) value of one cycle of a

 waveform by formula.

sliding_rms.mcd

 Applying the rms calculation in a sliding window along a waveform greater

 than one cycle in length.

actual_rms.mcd

 Applying the sliding window rms calculation to the actual waveform described

 above in the "actual_dft.mcd" description.

discrete_convolution.mcd

 The discrete convolution of two number sequences.  Here is an animation

 of the convolution, discrete_convolution.avi

russ_mcad_files.zip

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