气体放电灯的供电研究

Analysis About the Supply Current by Using Gas Discharge Lamps

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价值。

Mass-using discharge lamps in the triphase illumination will be cause some problem for the electric source,therefore some triphase symmetrical circuit and varied unsymmetrical circuit have been studied.According to the analysis of expermental data and the neutral Current waves, some results as follows: 1. The rations of the neutral current to the full-load phase current is 32.7% even if the triphase load is totally symmelry. 2. The neutral current is still larger than the full-load current on the condition of typical dlssymmetrical circuit. 3. If we change the circuit construction, the neutral current will belarger than twice as the phase current. 4. There are many high-frequency hurmonices in the neutral current, it is a hurmonlce source. These analyses and the expermental data of great value to the illuminalive power-supply design and the cable manufactary.