Harmonic Filters

//Harmonic Filters谐波滤波器

These filters are used when the main objective is not the reactive power compensation at the fundamental frequency, but to reduce the harmonic distortion in the supply system.Among the problems caused by harmonics and which may make their suppression necessary, are the following:
使用这些滤波器的主要目标不是基频无功功率补偿,而是减少供电系统中的谐波失真。在谐波引起的问题和可能需要抑制的情况中,主要包括以下几个方面:

  • Interferences in telecommunications.
    电信干扰。
  • Distortion on the mains voltage.
    电源电压失真。
  • Disturbances in electronic systems.
    电子系统中的干扰。
  • Erratic operation of control and protection relays.
    控制和保护继电器的操作不稳定。
  • Failures in transformers and motors, due to overheating caused by losses on the core.
    变压器和电动机发生故障,可能是核心损耗导致过热。
  • Overheating of protective fuses to the point where a minor spike on the line causes them to blow.
    保护性保险丝过热至导线上的轻微尖峰导致它们熔断的程度。

It should be pointed out that the impedance of all the filters is capacitive below its tuning frequency, whereby they also contribute, even if in a small scale, to the reactive power compensation at the fundamental frequency. Installation of filters produces a modification on the topology of the electrical supply system. For this reason, the design of filters must be done with regard to an accurate analysis and study of the whole system.
应该指出的是,所有滤波器的阻抗在其调谐频率以下是电容性的,由此它们即使在小范围内也有助于基频处的无功功率补偿。 过滤器的安装会对供电系统的拓扑结构进行修改。 因此,必须对过滤器的设计进行准确的分析和整个系统的研究。

According to the application, there are different types of filters:
根据应用设备,有不同类型的过滤器: