Accidental mesh prevention relay

A power system, comprising:

• at least two portions of the power system that can be electrically separated from one another;
• a line relay electrically connecting the at least two portions of the power system;
• wherein the line relay comprises:
• a processor that measures voltage on either side of the line relay, calculates frequency on either side of the line relay, and determines correlation or mean absolute error (MAE) between the frequency on either side of a line relay, the processor compares the correlation or MAE between the determined frequencies over time and determines if a change in the correlation or MAE identifies that closing a specific switch would create or not create an unintentional loop in a power system, the processor sending out a signal to the line relay to close the line relay upon determining that closing the switch would not create an unintentional loop;
• and
• a switch for closing the electrical connection between the first and second power distribution circuits;
• wherein the MAE is determined by:
• MAE
• k
• =
• ∑
• i
• =
• k
• k
• +
• N
• ⁢
• ❘
• "\[LeftBracketingBar]"
• f
• 1
• ,
• i
• -
• f
• 2
• ,
• i
• ❘
• "\[RightBracketingBar]"
• N
• where k is the starting index of the MAE window, MAEk is the value of the MAE over the window starting at point k, f1 and f2 are the two vectors of frequency measurements, and N is the number of data points over which the MAE is calculated.

A method for preventing a closed loop in a power system, comprising:

• disposing between a first and a second power distribution circuit a line relay that determines a safe condition for closing the line relay;
• wherein the line relay comprises:
• a processor that measures voltage on either side of the line relay, calculates frequency on either side of the line relay, and determines correlation or mean absolute error (MAE) between the frequency on either side of a line relay, the processor compares the correlation or MAE between the determined frequencies over time and determines if a change in the correlation or MAE identifies that closing a specific switch would create or not create an unintentional loop in a power system, the processor sending out a signal to the line relay to close the line relay upon determining that closing the switch would not create an unintentional loop;
• and
• a switch;
• wherein the MAE is determined by:
• MAE
• k
• =
• ∑
• i
• =
• k
• k
• +
• N
• ⁢
• ❘
• "\[LeftBracketingBar]"
• f
• 1
• ,
• i
• -
• f
• 2
• ,
• i
• ❘
• "\[RightBracketingBar]"
• N
• where k is the starting index of the MAE window, MAEk is the value of the MAE over the window starting at point k, f1 and f2 are the two vectors of frequency measurements, and N is the number of data points over which the MAE is calculated.