Identification of measurement technology for online recording of transients in underground residential distribution system.

摘要

Underground Residential Distribution (URD) power cables are aged due to electrical, thermal, mechanical, and environmental stresses during their service. The recent dielectric conditions of the cables are of much interest for utilities. The existing offline diagnostic method requires forceful disconnection of the URD cable for maintenance. Online recording and Fast Fourier Transform analysis of intentionally created transients in URD is one of the promising methods to assess the current condition of the cable. For the larger goal of developing an online power cable condition assessment, the measurement techniques, which are required to be implemented, have to be evaluated. In order to implement the online measurement system, the requirements of the measurement system have to first be identified. URD system model was simulated using the Electro Magnetic Transient Program to identify the characteristics of induced transients. A list of requirements of the measurement system was created based on the simulation results.