Features

Protection Features

• Phase overcurrent elements:

• Three instantaneous elements with timers ( 50P[1], 50P[2], and

50P[3])

• Three inverse time overcurrent elements (51P[1], 51P[2], and

51P[3])

• 11 standard curves

• Instantaneous or time delay reset

• Voltage Restraint (51P[2], and 51P[3])

• Directional Control (All Elements)

• Ground overcurrent elements:

• Two instantaneous measured elements with timers (50X[1],

and 50X[2])

• Two instantaneous calculated elements with timers (50R[1],

and 50R[2])

• Two inverse time overcurrent measured elements (51X[1], and

51X[2])

• Two inverse time overcurrent calculated elements (51R[1], and

51R[2])

• 11 standard curves

• Instantaneous or time delay reset

• Directional Control (All Elements)

• Breaker failure (50BF) .

• Phase unbalance negative sequence overcurrent (46[1], 46[2])) .

• Phase voltage unbalance and sequence protection (47[1], 47[2]) .

• Main 3-phase under/overvoltage (27M[1], 27M[2], 59M[1], 59M[2])

• Auxiliary single-phase under/overvoltage (27A[1], 27A[2], 59A[1],

59A[2])

• Ground fault overvoltage relay (59N[1], 59N[2])

• 6 Frequency elements that can be assigned to: over frequency,

under frequency, rate of change, or vector surge (81[1], 81[2],

81[3], 81[4], 81[5], 81[6])

• Apparent and displacement power factor (55A[1], 55A[2], 55D[1],

55D[2]) .

• Forward and Reverse Watts (32[1], 32[2], 32[3])

• Forward and Reverse Vars (32V[1], 32V[2], 32V[3])

• Synch Check (25)

• Autoreclosing (79)

• Zone interlocking for bus protection (87B) .

• Switch onto fault protection

• Cold load pickup