AUTOMATIC IDENTIFICATION OF MULTIPLE POWER GRIDS USING DATA SYNCHRONIZATION
First Claim
1. A method of automatically identifying a plurality of independent electrical grids in a utility system that includes a plurality of intelligent electronic devices (IEDs) communicatively linked to a master controller in the utility system, comprising:
- communicating from the master controller an instruction to each of the IEDs in a sequential order at a predetermined time interval (a) to begin storing variation data indicative of variations of an electrical characteristic in a corresponding monitored current or voltage signal being monitored by respective ones of the IEDs, and (b) to store a point on the signal as a periodic indicator value;
receiving from each of the IEDs the variation data and the corresponding periodic indicator value;
for a plurality of pair combinations of the IEDs, automatically correlating, via the master controller, the respective variation data from each of the pair combinations to produce a plurality of first correlation values and determining, responsive to the automatically correlating, via the master controller, whether a correlation criterion is satisfied for each of the pair combinations, wherein each of the first correlation values is associated with a corresponding first periodic indicator offset value, wherein the first periodic indicator offset value corresponds to a difference between the respective periodic indicator values for the pair combination; and
responsive to the correlation criterion not being satisfied for a flagged one of the pair combinations, storing an indication that the IEDs corresponding to the flagged pair combination are in different electrical grids.
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Accused Products
Abstract
A method of automatically identifying whether intelligent electronic devices (IEDs) in a power monitoring system are in multiple electrical grids. A controller sends an instruction to each IED in a predetermined time sequence such that each IED receives the instruction at a different time, commanding each IED to begin logging variation data indicative of frequency variations in a current/voltage signal monitored by the IED and to send the variation data to the controller and an associated cycle count of a point in the current/voltage signal. The controller receives the variation data and associated cycle count and determines a peak correlation using a data alignment algorithm on IED pair combinations. If the IEDs are on the same electrical grid, the peak correlations should occur at cycle count offsets that match the order that the IEDs received the instruction. Any discrepancies in the expected order of peak correlations are flagged, and the corresponding IEDs are determined to be on different grids.
56 Citations
20 Claims
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1. A method of automatically identifying a plurality of independent electrical grids in a utility system that includes a plurality of intelligent electronic devices (IEDs) communicatively linked to a master controller in the utility system, comprising:
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communicating from the master controller an instruction to each of the IEDs in a sequential order at a predetermined time interval (a) to begin storing variation data indicative of variations of an electrical characteristic in a corresponding monitored current or voltage signal being monitored by respective ones of the IEDs, and (b) to store a point on the signal as a periodic indicator value; receiving from each of the IEDs the variation data and the corresponding periodic indicator value; for a plurality of pair combinations of the IEDs, automatically correlating, via the master controller, the respective variation data from each of the pair combinations to produce a plurality of first correlation values and determining, responsive to the automatically correlating, via the master controller, whether a correlation criterion is satisfied for each of the pair combinations, wherein each of the first correlation values is associated with a corresponding first periodic indicator offset value, wherein the first periodic indicator offset value corresponds to a difference between the respective periodic indicator values for the pair combination; and responsive to the correlation criterion not being satisfied for a flagged one of the pair combinations, storing an indication that the IEDs corresponding to the flagged pair combination are in different electrical grids. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method of automatically identifying a plurality of independent electrical grids in a utility system that includes a plurality of intelligent electronic devices (IEDs) communicatively linked to a master controller in the utility system, comprising:
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communicating from the master controller an instruction to each of the IEDs to begin storing variation data indicative of variations of an electrical characteristic in a corresponding monitored current or voltage signal being monitored by respective ones of the IEDs; storing a first time that the instruction is communicated from the master controller to each of the IEDs; determining a second time corresponding to a time that the IED has started to store the variation data; receiving from each of the IEDs the variation data; for a plurality of pair combinations of the IEDs, automatically correlating, via the master controller, the respective variation data from each of the pair combinations to produce a plurality of first correlation values and determining, responsive to the automatically correlating, via the master controller, whether a peak one of the first correlation values occurs between the first time and the second time for one of the IEDs in the respective pair combination; and responsive to the peak one of the first correlation values not occurring between the first time and the second time, storing an indication that the IEDs corresponding to the pair combination are in different electrical grids. - View Dependent Claims (19, 20)
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Specification