Schweitzer Engineering Laboratories SEL-387E - Page 48

iv Protection Functions Date Code 20080110
SEL-387E Instruction Manual
TABLES
Table 3.1: Overcurrent Element Summary .............................................................................................3-35
FIGURES
Figure 3.1: Percentage Restraint Differential Characteristic ....................................................................3-2
Figure 3.2: Winding 1 Compensated Currents..........................................................................................3-3
Figure 3.3: Differential Element (87-1) Quantities...................................................................................3-4
Figure 3.4: Differential Element Decision Logic......................................................................................3-5
Figure 3.5: Differential Element Harmonic Blocking Logic ....................................................................3-6
Figure 3.6: Differential Element (87BL1) Blocking Logic ......................................................................3-7
Figure 3.7: DC Blocking (DCBL1) Logic ................................................................................................3-8
Figure 3.8: Winding Connections, Phase Shifts, and Compensation Direction......................................3-17
Figure 3.9: Example 1 for WnCTC Selection.........................................................................................3-19
Figure 3.10: Example 2 for WnCTC Selection.......................................................................................3-21
Figure 3.11: REF Enable/Block Logic....................................................................................................3-29
Figure 3.12: REF Directional Element ...................................................................................................3-30
Figure 3.13: REF Protection Output (Extremely Inverse-Time O/C).....................................................3-31
Figure 3.14: REF Function, 32IOP Setting Guide ..................................................................................3-33
Figure 3.15: 50Pn1 Phase Definite-Time O/C Element, Torque Controlled ..........................................3-36
Figure 3.16: 50Pn2 Phase Instantaneous O/C Element, Torque Controlled...........................................3-36
Figure 3.17: 50Pn3 and 50Pn4 Phase Instantaneous O/C Element, Nontorque Controlled....................3-37
Figure 3.18: 51Pn Phase Inverse-Time O/C Element, Torque Controlled .............................................3-37
Figure 3.19: 50Qn1 and 50Nn1 Sequence Definite-Time O/C Element, Torque Controlled.................3-38
Figure 3.20: 50Qn2 and 50Nn2 Sequence Instantaneous O/C Element, Torque Controlled..................3-39
Figure 3.21: 51Qn and 51Nn Sequence Inverse-Time O/C Element, Torque Controlled ......................3-39
Figure 3.22: Combined Overcurrent Example........................................................................................3-41
Figure 3.23: 51PC1 and 51NC1 Combined Inverse-Time O/C Elements ..............................................3-42
Figure 3.24: U.S. Moderately Inverse Curve: U1..................................................................................3-53
Figure 3.25: U.S. Inverse Curve: U2 .....................................................................................................3-53
Figure 3.26: U.S. Very Inverse Curve: U3 ............................................................................................3-53
Figure 3.27: U.S. Extremely Inverse Curve: U4....................................................................................3-53
Figure 3.28: U.S. Short-Time Inverse Curve: U5 .................................................................................3-54
Figure 3.29: I.E.C. Class A Curve (Standard Inverse): C1....................................................................3-54
Figure 3.30: I.E.C. Class B Curve (Very Inverse): C2 ..........................................................................3-54
Figure 3.31: I.E.C. Class C Curve (Extremely Inverse): C3..................................................................3-54
Figure 3.32: I.E.C. Long-Time Inverse Curve: C4 ................................................................................3-55
Figure 3.33: I.E.C. Short-Time Inverse Curve: C5................................................................................3-55
Figure 3.34: Overvoltage Element Logic Diagram.................................................................................3-56
Figure 3.35: Undervoltage Element Logic Diagram...............................................................................3-57
Figure 3.36: Undervoltage Block for Frequency Elements ....................................................................3-59
Figure 3.37: Frequency Element Logic...................................................................................................3-60
Figure 3.38: Volts/Hertz Element Logic Diagram..................................................................................3-62
Figure 3.39: Dual-Level Volts/Hertz Time-Delay Characteristic 24CCS=DD .....................................3-63
Figure 3.40: Composite Inverse/Definite-Time Overexcitation Characteristic, 24CCS=ID ..................3-63
Figure 3.41: Volts/Hertz Inverse-Time Characteristic, 24IC = 0.5.........................................................3-68
Figure 3.42: Volts/Hertz Inverse-Time Characteristic, 24IC = 1............................................................3-69
Figure 3.43: Volts/Hertz Inverse-Time Characteristics, 24IC = 2..........................................................3-70