RFI source-locating on power lines-an update

The author describes a practical and efficient means for locating RI (radio interference) and TVI (television interference) sources on power lines, particularly those operating below 70 kV, where most complaints originate. The main emphasis is on locating sparking sources on overhead lines, but the location of RFI sources occurring in underground lines and the location of nonspeaking power line sources are also treated. Particular attention is given to the use of a vehicular locating set (VLS) and its auxiliary equipment. The VLS, with its oscilloscope presentation, tells the investigator if there is a single source of many sources, and makes it possible to handle these one at a time, and to get within one or two poles of a source. It is also shown that a hot-stick sniffer with a dual VHF/ultrasonic function is effective in rapidly pinpointing RFI sources on low-voltage transmission lines