11.62
SEL-421 Relay Instruction Manual Date Code 20171021
Relay Word Bits
Row Lists
274 MBC1F Zone 1 filtered Mho BC phase element
274 MAB1F Zone 1 filtered Mho AB phase element
275 XAB3F Zone 3 quad AB phase element
275 MCA3F Zone 3 filtered Mho CA phase element
275 MBC3F Zone 3 filtered Mho BC phase element
275 MAB3F Zone 3 filtered Mho AB phase element
275 XCA2F Zone 2 quad CA phase element
275 XBC2F Zone 2 quad BC phase element
275 XAB2F Zone 2 quad AB phase element
275 MCA2F Zone 2 filtered Mho CA phase element
276 XCA4F Zone 4 quad CA phase element
276 XBC4F Zone 4 quad BC phase element
276 XAB4F Zone 4 quad AB phase element
276 MCA4F Zone 4 filtered Mho CA phase element
276 MBC4F Zone 4 filtered Mho BC phase element
276 MAB4F Zone 4 filtered Mho AB phase element
276 XCA3F Zone 3 quad CA phase element
276 XBC3F Zone 3 quad BC phase element
277 * Reserved
277 * Reserved
277 XCA5F Zone 5 quad CA phase element
277 XBC5F Zone 5 quad BC phase element
277 XAB5F Zone 5 quad AB phase element
277 MCA5F Zone 5 filtered Mho CA phase element
277 MBC5F Zone 5 filtered Mho BC phase element
277 MAB5F Zone 5 filtered Mho AB phase element
Table 11.53 Relay Word Bits: High-Speed Mho and Quad Ground-Distance (Sheet 1 of 2)
Row Name Description
278 MBG3H High-speed Zone 3 Mho BG ground element
278 MAG3H High-speed Zone 3 Mho AG ground element
278 MCG2H High-speed Zone 2 Mho CG ground element
278 MBG2H High-speed Zone 2 Mho BG ground element
278 MAG2H High-speed Zone 2 Mho AG ground element
278 MCG1H High-speed Zone 1 Mho CG ground element
278 MBG1H High-speed Zone 1 Mho BG ground element
278 MAG1H High-speed Zone 1 Mho AG ground element
279 XAG3H High-speed Zone 3 high-speed quad A-G ground element
279 XCG2H High-speed Zone 2 quad CG ground element
279 XBG2H High-speed Zone 2 quad BG ground element
279 XAG2H High-speed Zone 2 quad AG ground element
Table 11.52 Relay Word Bits: Full-Cycle Mho and Phase Quad Phase-Distance (Sheet 2 of 2)
Row Name Description
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