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1BIEC 255-4 AND BS142 CURVES
0BCURVES FOR TIME CHARACTERISTICS
Appendix I. CURVES FOR TIME CHARACTERISTICS
I.1. IEC 255-4 AND BS142 CURVES
Types:
Standard Inverse.
Very Inverse
Extremely Inverse
Short Inverse
Long Inverse
General equation
1
I
I
A
*
M
T
α
o
operate
−
=
2
o
dropout
I
I
1
tr
*
M
T
−
=
where:
T
OPERATE
: trip time (seg)
T
DROPOUT
: drop out time (seg)
M: Time index. Valid range from 0.05 to 1.09 in steps of 0.01
I: Messured current
Io: Configured pickup current
A,
α
, tr: Depending on the curve constants
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...