11.37
Date Code 20171021
Instruction Manual
SEL-421 Relay
Relay Word Bits
Row Lists
16
XAG1
Zone 1 quad A-Phase-to-ground element
16
XBG1
Zone 1 quad B-Phase-to-ground element
16
XCG1
Zone 1 quad C-Phase-to-ground element
16
*
Reserved
16
XAG2
Zone 2 quad A-Phase-to-ground element
16
XBG2
Zone 2 quad B-Phase-to-ground element
16
XCG2
Zone 2 quad C-Phase-to-ground element
16
*
Reserved
17
XAG3
Zone 3 quad A-Phase-to-ground element
17
XBG3
Zone 3 quad B-Phase-to-ground element
17
XCG3
Zone 3 quad C-Phase-to-ground element
17
*
Reserved
17
XAG4
Zone 4 quad A-Phase-to-ground element
17
XBG4
Zone 4 quad B-Phase-to-ground element
17
XCG4
Zone 4 quad C-Phase-to-ground element
17
*
Reserved
18
XAG5
Zone 5 quad A-Phase-to-ground element
18
XBG5
Zone 5 quad B-Phase-to-ground element
18
XCG5
Zone 5 quad C-Phase-to-ground element
18
CVTBLH
CCVT transient blocking logic active—high-speed elements
Note:
The SEL-421-4 does not provide high-speed distance elements, so the CVTBLH Relay Word bit is unavailable.
18
CVTBL
CCVT transient blocking logic active
18
VPOLV
Polarizing voltage valid
18
M1P–M2P
Zone 1–2 Mho phase-distance element
19
M3P–M5P
Zone 3-5 Mho phase-distance element
19
M1PT–M5PT
Zone 1–5 Mho phase-distance, time-delayed
Table 11.4
Relay Word Bits: Series-Compensated Line Logic
Row
Name
Description
20
SERCAB
Series-compensated line AB-Phase output
20
SERCBC
Series-compensated line BC-Phase output
20
SERCCA
Series-compensated line CA-Phase output
20
SERCA
Series-compensated line A-Phase output
20
SERCB
Series-compensated line B-Phase output
20
SERCC
Series-compensated line C-Phase output
20
*
Reserved
20
*
Reserved
Table 11.3
Relay Word Bits: Distance Elements (Sheet 4 of 4)
Row
Name
Description
Summary of Contents for SEL-421-4
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