Notching

01:55 / Posted by tech data /

Notching is a periodic voltage disturbance caused by the normal operation of power electronic devices when current is commutated from one phase to another. Since notching occurs continuously, it can be characterized through the harmonic spectrum of the affected voltage. However, it is generally treated as a special case. The frequency components associated with
notching can be quite high and may not be readily characterized with measurement equipment normally used for harmonic analysis.

Figure shows an example of voltage notching from a three-phase converter that produces continuous dc current. The notches occur when the current commutates from one phase to another. During this period, there is a momentary short circuit between two phases, pulling the
voltage as close to zero as permitted by system impedances.

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