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1BPROTECTION FUNCTIONS
PROTECTION, CONTROL AND METERING FUNCTIONS
Figure 2-3 High level phase instantaneous overcurrent elements
2.1.2. NEUTRAL OVERCURRENT PROTECTION
2.1.2.1. GENERAL DESCRIPTION
Applicable for grounded-neutral systems; settings for the definite time, inverse time
and instantaneous functions are independent (functions 50N/51N).
2.1.2.2. TIME OVERCURRENT ELEMENTS (51N)
Figure 2-4 shows the logical diagram for the neutral time overcurrent function.
IFA
MED
IFA High pickup
blkAnyOC
blkAnyProt
r50HPaTrip
(trip)
r50HPaPkup
(pickup)
blk50
+
-
blk50HPa
+
-
IFB
MED
IFB High pickup
blk50HPb
IFC
MED
IFC High pickup
+
-
blk50HPc
IFN
MED
Def. Time
0
Def. Time
0
Def. Time
0
r50HPbPkup
(pickup)
r50HPbTrip
(trip)
blkAnyPhaseOC
I
r50HPcPkup
(pickup)
Summary of Contents for smART P500
Page 1: ...Instruction Manual Multifunction Protection Relay smART P500...
Page 23: ...2BTABLES INDEX THIS PAGE HAS BEEN LEFT BLANK INTENTIONALLY...
Page 39: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 9 Wye Wye Connection measured neutral...
Page 40: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 10 Wye Wye Connection sensitive neutral...
Page 41: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 11 Open Delta Connection measured neutral...
Page 42: ...5BHARDWARE FEATURES INTRODUCTION Figure 1 12 Open Delta Connection sensitive neutral...
Page 511: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 6 Moderately ANSI curve...
Page 513: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 7 Very inverse ANSI curve...
Page 515: ...2BANSI CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 8 Extremely inverse ANSI curve...
Page 532: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 14 Recloser Curves 101 119...
Page 535: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 15 Recloser Curves 120 142...
Page 538: ...4BRECLOSER CURVES 0BCURVES FOR TIME CHARACTERISTICS Figure I 16 Recloser Curves 151 202...