The brochure discusses the equipment and devices of high-frequency channels of relay protection of power lines. The method of setting up the PVZK equipment is given. ICPD, UPZ-70 and EHF-ZM and actually high-frequency protection channels. Data on technical characteristics, methods of adjustment, inspection and testing of these devices are systematized, the encountered malfunctions and defects, methods of their elimination are indicated. Materials on instruments used during adjustment and operation of high-frequency equipment and protection devices, on registration of inspection and test results are given. The brochure is designed for electricians and foremen engaged in the adjustment and operation of relay equipment and including relay protections of power lines.