In the Xingtai area, with many companies of mine, smelting, mechanical treatment and Jingguang electric railway passing through this area, a mass of harmonics have been injected into the power system.

• 邢台地区矿产、冶炼、机械加工生产单位众多，京广电气化铁路横跨市区及五县(市)，给系统注入了大量的谐波电流。