Schweitzer Engineering Laboratories SEL-787-3 - Page 2

SEL-787-3, -4 Data Sheet Schweitzer Engineering Laboratories, Inc.
2
Table 2 Protection Element Table
Protection Elements
4 Windings
3 Windings With IN
Channel and 3-Phase
Voltages
3 Windings With
VS/VBAT Channel and
3-Phase Voltages
SEL-787-4X
SEL-787-3E SEL-787-3S
87 Phase Differential X X X
REF Restricted Earth Fault X
a
X
a
X
a
50P Phase Overcurrent X X X
50Q Neg.-Seq. Overcurrent X X X
50G Ground Overcurrent X X X
50N Neutral Overcurrent X
51P Phase Time-Overcurrent X X X
51Q Neg.-Seq. Time-Overcurrent X X X
51G Ground Time-Overcurrent X X X
51PC Combined Winding Phase Time-
Overcurrent
X X X
51GC Combined Winding Ground Time-
Overcurrent
XXX
51N Neutral Time-Overcurrent X
27P Phase Undervoltage X X
27PP Phase-to-Phase Undervoltage X X
27S VS Channel Undervoltage X
59P Phase Overvoltage X X
59PP Phase-to-Phase Overvoltage X X
59Q Neg.-Seq. Overvoltage X X
59G Ground Overvoltage X X
59S VS Channel Overvoltage X
24 Volts/Hz X X
25 Synchronism Check X
32 Directional Power X X
49RTD RTDs X X X
60LOP Loss of Potential X X
81 Over- and Underfrequency X X
BF Breaker Failure X X X
a
Refer to Table 3 for the available REF elements based on the configuration of Winding 3.
Table 3 Available Differential and REF Elements Based on the Configuration of Winding 3
Elements SEL-787-3E SEL-787-3S SEL-787-4X
Differential Protection Windings (Standard) 3 3 4
REF Elements (Standard) 1 0 0
Differential Protection Windings
(Winding 3 Configured for REF)
223
REF Elements
(Winding 3 Configured for REF)
322