Schweitzer Engineering Laboratories SEL-311L, Instruction Manual, Page: 369 / 734

Date Code 20010625 Setting the Relay 9-31
SEL----311L Instruction Manual
Row Bit Definition
Primary
Application
56 87L ORed combination of 87LA, 87LB, 87LC, 87L2, and
87LG (see Figure 3.17)
87LA A-Phase differential trip output (see Figure 3.17)
87LB B-Phase differential trip output (see Figure 3.17)
Testing, Control
87LC C-Phase differential trip output (see Figure 3.17)
87L2 Negative-sequence differential trip output
(see Figure 3.18)
87LG Zero-sequence differential trip output
(see Figure 3.19)
CHYAL
Status of Channel X (see Section 10 )
Alarming
CHXAL Status of Channel Y (see Section 10 )
57 87LOPA A-Phase differential current enable level detector
(see Figure 3.17)
87LAE A-Phase differential calculation enable
(see Figure 3.17)
R87LA A-Phase restrain region detection output
Testing, Control
CTAA A-Phase CT alarm level detector (see Figure 3.17)
PQ87LA Protection quality 87LA alarm (see Figure 3.17)
Alarming
TRIP87 Line current differential trip logic output asserted
(see Figure 5.1 and Figure 5.4) Tripping
BXYZ2 Negative-sequence CT saturation and outfeed block
BXYZG Zero-sequence CT saturation and outfeed block
Testing, Control
58 87LOPB B-Phase differential current enable level detector
(see Figure 3.17)
87LBE B-Phase differential calculation enable
(see Figure 3.17)
R87LB B-Phase restrain region detection output
(see Figure 3.17)
CTAB B-Phase CT alarm level detector (see Figure 3.17) Alarming
PQ87LB Protection quality 87LB alarm
BXYZA A-phase CT saturation and outfeed block
BXYZB B-phase CT saturation and outfeed block
Testing, Control
BXYZC C-phase CT saturation and outfeed block