2-6 Specifications Date Code 20011026
SEL-321/321-1 Instruction Manual
Settings Phase Residual Neg.-Seq.
Pickup 51PP 51NP 51QP
Curve Family (US or IEC) 51PC 51NC 51QC
Time Dial 51PTD 51NTD 51QTD
Reset Delay 51PRS 51NRS 51QRS
Torque Control 51PTC 51NTC 51QTC
Torque Control Options:
• Zone 2 Phase Mho (M2P) X X
• Zone 2 Ground Dist (Z2G) X X
• 32QF (forward) X X
• 32QR (reverse) X X
• Nondirectional X X X
Reset delay setting choices permit one-cycle resetting or slow resetting, which emulates
induction disk resetting.
Outputs
Phase Residual Neg.-Seq.
Pickup 51PP 51NP 51QP
Timed Out 51PT 51NT 51QT
Resetting 51PR 51NR 51QR
Supporting Drawings: Figure 2.23 through Figure 2.26.
TIME-OVERCURRENT ELEMENTS (SEL-321-1 RELAY ONLY)
Phase, negative-sequence, and residual time-overcurrent elements are available as enabled. Both
US and IEC curve shapes are supported. The phase element uses the highest measured phase
current, while the negative-sequence and residual current elements use 3I
2
and I
R
currents,
respectively.
Settings
Phase Residual Neg.-Seq.
Pickup 51PP 51NP 51QP
Curve Family (US or IEC) 51PC 51NC 51QC
Time Dial 51PTD 51NTD 51QTD
Reset Delay 51PRS 51NRS 51QRS
Torque Control 51PTC 51NTC 51QTC
Torque Control Options:
• Zone 2 Phase Mho (M2P) X X
• Load Encroachment X
• Zone 2 Ground Dist (Z2G) X X
• 32QF (forward) X X
• 32QR (reverse) X X
• Nondirectional X X X
Reset delay setting choices permit one-cycle resetting or slow resetting, which emulates
induction disk resetting.
To Next Page
Loading...
