Loop Transient Measurements in Cleveland, South Carolina

The design of telephone equipment must accommodate lightning and 60-Hz disturbances which may be present at the network-terminal interface. To characterize these disturbances more thoroughly, the Protection Engineering Group has engaged in a monitoring program from which results obtained at Washington, Connecticut, are reported elsewhere in this issue. 1 As described in that article, the telephone plant at Washington, Connecticut was aerial, the local power distribution was delta, and minimal exposure to power transmission systems existed. For the second phase of this program, a computer-based transient monitoring system (TMS) was developed and installed in Cleveland, South Carolina during 1978. In contrast to the Washington location, the cable plant at Cleveland was primarily buried, the local power distribution was multi-grounded neutral, and the cable route was exposed to several power transmission systems. It was desired to determine if different plant characteristics would produce major changes in the data obtained. The results from Cleveland are presented in this article and contrasted with previous measurements. 1645