To begin with the generation,characteristics and hazards of civil building harmonic current,it mainly analyzes the causes of neutral line overloading owning to the third-harmonic current and odd harmonic current in three-phase alternating current circuit,%从民用建筑谐波电流的产生、特点及其危害着手,着重分析了三次谐波电流及其奇数倍的谐波电流在三相交流电路中会引起中性线过载的原因,并提出了相应的预防措施,以期指导实践。
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