SYSTEM AND METHOD FOR MONITORING AN ELECTRICALLY-CONNECTED SYSTEM HAVING A PERIODIC BEHAVIOR

摘要

A method for monitoring a system having an electrical connection, the connection having at least two phases and respective currents, the system having a periodic behavior, the method including the steps of: connecting sensors to measure respective currents of two phases of the electrical connection; transforming the measured currents to create initial current information; making an initial determination of a normal operation of the system; performing training and modeling of the system, following the initial determination of normal operation of the system, the training and modeling including further current measurements yielding modeled current information; monitoring the system, including instant current measurements to yield instant current information indicative of instant operation status of the system; and making an instant determination of operation status of the system by comparing the instant current information with the modeled current information.

主权项

1. A method for monitoring a system having an electrical connection, the connection having at least two phases and respective currents, the system having a periodic behavior, the method comprising the steps of:
connecting sensors to measure respective currents of two phases of the electrical connection and transferring the measured current information to a PC host; using the PC host to transform the measured currents and to create initial current information whereby the initial current information includes: a normalized correlation frequency spectrum, derived from the cross power spectrum of the at least two phases; a non-trivial frequency spectrum derived from the normalized frequency spectrum; and a root-mean-square calculation of the non-trivial frequency spectrum; making an initial determination of a normal operation of the system using the PC host; operating the PC host to perform training and modeling of the system, following the initial determination of normal operation of the system, the training and modeling of the system including further current measurements yielding modeled current information; monitoring the system, which includes performing instant current measurements of the system and using the PC host to yield instant current information indicative of instant operation status of the system; and making an instant determination of operation status of the system by using the PC host to compare the instant current information with the modeled current information.