ABB RELION REX640 - Symbols and conventions; Symbols; Document conventions

4.1.2 Three-phase directional overcurrent protection DPHxPDOC (ANSI 67P/51P-1,
67P/51P-2)....................................................................................................................... 344
4.1.3 Three-phase voltage-dependent overcurrent protection PHPVOC (ANSI 51V)...... 369
4.1.4 Accidental energization protection GAEPVOC (ANSI 27/50)......................................378
4.1.5 Three-phase thermal protection for feeders, cables and distribution
transformers T1PTTR (ANSI 49F)................................................................................383
4.1.6 Three-phase thermal overload protection, two time constants T2PTTR (ANSI
49T/G/C)......................................................................................................................... 389
4.1.7 Motor load jam protection JAMPTOC (ANSI 50TDJAM).............................................. 398
4.1.8 Loss of load supervision LOFLPTUC (ANSI 37)............................................................. 402
4.1.9 Loss of phase, undercurrent PHPTUC (ANSI 37)...........................................................405
4.1.10 Thermal overload protection for motors MPTTR (ANSI 49M).................................... 410
4.1.11 Thermal overload protection for rotors RPTTR (ANSI 49R)........................................423
4.1.12 Generator shaft current leakage protection GSLPTOC ( ANSI 38,51)....................... 435
4.2 Earth-fault protection....................................................................................................................... 440
4.2.1 Non-directional earth-fault protection EFxPTOC (ANSI 51G/51N-1, 51G/51N-2,
50G/50N)........................................................................................................................440
4.2.2 Directional earth-fault protection DEFxPDEF (ANSI 67G/N-1 51G/N-1, 67G/N-1
51G/N-2).......................................................................................................................... 451
4.2.3 Transient-intermittent earth-fault protection INTRPTEF (ANSI 67NTEF/NIEF)..... 482
4.2.4 Admittance-based earth-fault protection EFPADM (ANSI 21NY)..............................490
4.2.5 Rotor earth-fault protection, injection method MREFPTOC (ANSI 64R)..................515
4.2.6 Harmonics-based earth-fault protection HAEFPTOC (ANSI 51NH)...........................521
4.2.7 Wattmetric-based earth-fault protection WPWDE (ANSI 32N).................................. 529
4.2.8 Third harmonic based stator earth-fault protection H3EFPSEF (ANSI 64TN)........ 541
4.2.9 Multifrequency admittance-based earth-fault protection MFADPSDE (ANSI
67NYH).............................................................................................................................553
4.2.10 Touch voltage based earth-fault current protection IFPTOC (ANSI 46SNQ/59N). 582
4.3 Differential protection....................................................................................................................... 643
4.3.1 Line differential protection with in-zone power transformer LNPLDF (ANSI 87L) 643
4.3.2 Stabilized and instantaneous differential protection for two-winding
transformers TR2PTDF (ANSI 87T)............................................................................ 680
4.3.3 Stabilized and instantaneous differential protection for two- or three-winding
transformers TR3PTDF (ANSI 87T3)........................................................................... 716
4.3.4 Numerically stabilized low-impedance restricted earth-fault protection
LREFPNDF (ANSI 87NLI)................................................................................................748
4.3.5 High-impedance based restricted earth-fault protection HREFPDIF (ANSI
87NHI)...............................................................................................................................759
4.3.6 High-impedance differential protection HIxPDIF (ANSI 87_A, 87_B, 87_C)..............772
4.3.7 Stabilized and instantaneous differential protection for machines MPDIF
(ANSI 87M/87G)..............................................................................................................788
4.3.8 High-impedance or flux-balance based differential protection MHZPDIF (ANSI
87HIM)............................................................................................................................. 806
4.4 Unbalance protection.........................................................................................................................819
Contents
REX640
Technical Manual
13