Band-go Filters only transmit a certain wavelength band and block Some others. The width of such a filter is expressed in the wavelength array it lets via, and might be something from a lot less than an Ångström to a couple hundred nanometers. Such a filter may be created by https://medium.com/@kheldiva/protective-relaying-for-symmetrical-faults-in-electrical-power-systems-43c4427ac9e2
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