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Electromagnetic disruptions are generated by almost every electronic device, which work is based on switching current with a huge frequency.The frequency of connections is from several dozens of Hz to several MHz. Higher harmonics of the current are not beneficial to the receivers, connected to the same power grid. They can cause overheating of cables and transformers, condensators in passive power compensation batteries, disrupted work of automatic switches. The propagation of disruptions of frequencies from 10MHz is conducted through conductivity, and over 30 MHz through radiation. Between 10 and 30 MHZ both ways of disruptions occur. 

RFI filters

To limit this unwanted occurrence, RFI filters are used. These filters effectively suppress current's higher harmonics in the range of 100 Hz – 30 MHz. With signals above 10 MHz, a significant effect on the filter's work has the way of montage of the fiter, its type and cable location. Filters are intended for use in devices such as: inverters, converters, pulse power supplies, medical devices, PC.