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本文分析了大量采用气体放电灯照明时，三相对称电路和多种典型的不对称电路。拍摄了这些电路的中线电流波形。分析这些波形可知： （１）即使三相负载完全对称，中线电流仍是满载相电流的３２．７％。 （２）典型的不对称情况下，中线电流大于满载相电流。 （３）若出现电路结构变化，中线电流可能大于相电流的两倍。 （４）大量采用气体放电灯的三相供电电路的中线电流不仅比相同情况的线性负载的中线电流大，而且高次谐波丰富，是一个新的谐波源。 这些分析及实验数据对照明供电设计及电缆制造厂家都有实用价值。
This paper analyzes a large number of gas discharge lamp lighting, the three-phase symmetrical circuit and a variety of typical asymmetric circuits. The midline current waveforms for these circuits were taken. Analyzing these waveforms shows that: (1) The neutral current is still 32.7% of the full load phase current even though the three-phase load is perfectly symmetrical. (2) In the typical case of asymmetry, the neutral current is greater than the full load phase current. (3) If the circuit structure changes, the neutral current may be greater than twice the phase current. (4) The neutral current of the three-phase power supply circuit which uses a large number of gas discharge lamps is not only larger than the neutral current of the linear load in the same situation, but also has a high harmonic wave, which is a new harmonic source. These analysis and experimental data have practical value for lighting power supply design and cable manufacturers.