医院供配电系统谐波状况普查与K系数研究

Harmonic Survey and K Coefficient Research for Power Supply and Distribution System in Hospital

通过对上海9家医院的变压器出线侧进行谐波测试,对数据进行整理分析,得出它们的K系数随着电流谐波畸变率变化的曲线,根据曲线拟合得出了医院建筑配电变压器电流畸变率在2.6%到22%之间的K系数估算方程。便于电气设计人员通过比较容易估算的谐波畸变率计算出K系数,进而得到降容系数D。在考虑医院建筑配电系统存在谐波的情况下,提供了标准变压器降容使用估算的一个途径。

Through the harmonic test on the side of transformer's outgoing line in 9 Shanghai's hospitals,the authors analyze the data and give the curve that the K coefficient changes along with the distortion factor of current harmonic. According to the curve fitting,the article concludes the estimating equation of K coefficient which the distortion factor of current for distribution transformer in hospital building is at the range of 2.6%~22%. It is easy for the electrical designer to calculate the K coefficient by the distortion factor of harmonic and to get the capacity-reducing factor of D. While the harmonic of distribution system in hospital building is taken into account,an approach of capacity-reducing estimation used for standard transformer is provided.