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Table 3 Current through relay coils in grid-connected and islanded operating modes for 7-bus microgrid system

From: Coordination of dual setting overcurrent relays in microgrid with optimally determined relay characteristics for dual operating modes

Faulty line Relay pair Primary relay Backup relay (dual) Fault current through relay coils
Grid-connected (A) Islanded mode (A)
Primary Backup Primary Backup
L1 RP1 R1 R3 12.075 3.19 9.03 0.64
  RP2 R1 R5 12.075 2.53 9.03 1.76
  RP3 R2 R7 17.175 4.13 11.52 1.45
L2 RP4 R3 R1 9.561 4.10 8.07 2.39
  RP5 R3 R5 9.561 2.16 8.07 1.04
  RP6 R4 R14 16.075 2.64 5.35 1.59
  RP7 R4 R15 16.075 1.69 5.35 3.30
L3 RP8 R5 R1 17.196 3.27 12.4 2.32
  RP9 R5 R3 17.196 2.67 12.4 0.538
  RP10 R6 R16 16.785 6.18 11.72 2.60
L4 RP11 R7 R2 7.038 9.94 6.174 7.34
  RP12 R8 R9 16.793 2.34 6.134 2.80
L5 RP13 R9 R8 16.038 6.08 5.356 6.52
  RP14 R10 R11 11.634 10.86 8.65 7.85
L6 RP15 R11 R10 19.90 19.37 9.154 8.36
  RP16 R12 R13 7.18 22.15 4.94 15.11
L7 RP17 R13 R12 18.28 5.75 9.675 2.97
  RP18 R14 R4 11.04 5.51 6.43 6.37
  RP19 R14 R15 11.04 3.012 6.43 3.66
L8 RP20 R15 R4 17.728 3.047 9.52 5.22
  RP21 R15 R14 17.728 2.075 9.52 1.435
  RP22 R16 R6 9.734 9.145 8.14 6.165