Why Does Third Harmonic Nuisance Persist in a Three-Phase Energy Meter System?

AI Thread Summary
The discussion centers on the persistence of third harmonic nuisance in a three-phase energy meter system, particularly in a medium voltage network with significant third harmonic current and a 10% unbalanced load. While the use of a star-delta connected interposing current transformer improved measurement accuracy, it did not completely eliminate the third harmonic issue. The ongoing nuisance may be attributed to transformer core saturation, which allows harmonics to pass through despite mitigation efforts. This highlights the challenges in achieving complete harmonic mitigation in electrical systems. The conversation underscores the complexity of managing harmonic distortion in three-phase networks.
m.s.j
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A three phase and three wire energy meter has installed in a medium voltage network with a lot of third harmonic current and unbalanced load (approximately %10). As you know, any distortion in sine wave and deviation of rated frequency in AC electrical system may be cause the increasing of measuring errors.
According to a common technical practice, the third harmonic of measuring current can be trapped by using of suitable interposing current transformer with star-delta connection. This recommendation applied in above mentioned system and accuracy of measuring system improved, but the system was not disencumbered of third harmonic nuisance completely.

How can you explain the reason of nuisance continuity?

BEST REGARDS
MSJ


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Ideal devices such as transformers can do things that real life devices can't.

My guess is that saturation in the transformer core is what allows harmonics to pass.
 
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