Patent ID: 9176171
Filing Date: 2015-11-03
Classification: G01R,H02J,Y02E,Y04S

Abstract:
1. A method for automatically aligning measured power-related data in a power monitoring system to a common reference point, comprising: receiving over a communications network from a reference monitoring device in the power monitoring system a voltage and a current measured by the reference monitoring device; retrieving from a memory model parameters of a transmission line model that characterizes a circuit including a conductor connected between the reference monitoring device and a second monitoring device in the power monitoring system; calculating a phase shift offset according to a function that includes the measured voltage, the measured current, and the model parameters, the phase shift offset indicating a phase difference of the current or voltage between the reference monitoring device and the second monitoring device; storing the phase shift offset associated with the reference monitoring device and the second monitoring device; adding the phase shift offset to a determined cycle count offset associated with the reference monitoring device and the second monitoring device to produce an aggregate offset, the cycle count offset representing an integer number of cycles that a measured characteristic by the reference monitoring device is to be added to or subtracted from a cycle count of the measured characteristic by the second monitoring device at a measured time, the cycle count representing a number of consecutive cycles of the measured voltage or current counted by the reference monitoring device or the second monitoring device; aligning the first voltage or current measured by the reference device temporally with the voltage or current measured by the second monitoring device using the aggregate offset; and adjusting at least one parameter of the second monitoring device based at least in part on the phase shift.