CalTrans Roadway Core Tests. Conducted at LLNL Roadway Powered Electric Vehicle Test Facility

摘要

A three-day series of tests was conducted on the Roadway Powered Electric Vehicle (RPEV) test facility at Lawrence Livermore National Laboratory (LLNL). The purpose of the tests was to characterize sample roadway cores supplied by the California Department of Transportation (CalTrans). The sample cores were to be characterized by means of power supplied via the source conductors in the return path of the LLNL powered roadway section. Power was to be transferred to the pickup of the RPEV test vehicle and dissipated in a water-cooled load. The first day the LLNL powered roadway was characterized at high (406 Hz) and low (196 Hz) frequencies in preparation for tests of the CalTrans roadway core sections over the following two days. This characterization was necessary in order to determine the values of the LLNL Powered Roadway electrical variables and therefore, to provide a basis for comparison of the LLNL cores with the CalTrans-supplied cores. The second day tests involved installing the CalTrans cores on the test track, measuring the core temperature and magnetic field before the power pickup was installed, and, finally with the pickup installed and measuring the load voltage, current, and power at test frequency of 197 Hz. The third day tests obtained performance data at 394 Hz. The measured data are plotted. The results show that, generally, for both the LLNL and CalTrans cores the system efficiency and pickup efficiency are higher at the higher frequency, and that the apparent higher core losses in the coupled CalTrans core caused the lower performance of that system and pickup. (ERA citation 07:054332)