## Frequency calculation for Oscillogram signals

For the program for viewing oscillogram in COMTRADE format, a function for calculating the frequency for analog signal from the oscillogram has been added.

Signal frequency, calculation of signal frequency, simulation of electrical signals, frequency filter.

For the program for viewing oscillogram in COMTRADE format, a function for calculating the frequency for analog signal from the oscillogram has been added.

In a previously published article, an option was presented to calculate the frequency of an electrical signal from a transition through zero. This article provides an example implementation of a frequency filter.

Some relay protection and automation functions require information about the frequency of the observed voltage or current. We will consider the option of calculating the frequency of the electric signal from the transition through zero.