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在公共电网上存在着各种形式的干扰。除了供电中断可以明显察觉外,绝大多数干扰都是不容易察觉的。然而,正是这种不易察觉的干扰对正常运行的电器电子设备存在着严重的威胁。如:雷电在电网上感应的干扰可使瞬间电压高达二万伏以上,将电网上的用电设备烧毁。高次谐波在零线上的干扰会严重影响高频通讯设备的工作,使数字电路误
There are various forms of interference on the public power grid. In addition to the power supply can be clearly aware of interruption, the vast majority of interference are not easy to detect. However, it is this imperceptible disturbance that poses a serious threat to the functioning electrical and electronic equipment. Such as: lightning in the grid induced interference can make the instantaneous voltage up to 20,000 volts or more, the power grid equipment burned. High-order harmonic interference in the zero line will seriously affect the work of high-frequency communications equipment, digital circuit error