CHAPTER 6: METERING HARMONIC DETECTION
869 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL 6–15
Harmonic Detection
The second, third, fourth, and fifth harmonics per phase are shown here. The harmonics
values are presented in percent relative to the fundamental magnitude.
Note that similar harmonic ratios and THD values are also displayed under the general
metering menus, “Harmonics 1 - J1 Current”, “Harmonics 3 - K1 Current”, or “Harmonics 4 –
K2 Current”, where all values are calculated every three cycles. The THD values used in the
Harmonic Detection element are the same for the general metering, so they are not shown
here again. The harmonic ratios in the Harmonic Detection element are calculated and
updated every protection pass.
Path: Metering > Harmonic Detection
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