Siemens SIPROTEC 7UM62, Manual

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Table of Contents
vi
7UM62 Manual
C53000-G1176-C149-3
2.7.2 Setting Hints ......................................................................................................................... 44
2.7.2.1 Settings for the I>> Stage of the Definite-Time Overcurrent Protection ............................... 47
2.7.2.2 Information for the I>> stage of the Definite-Time Overcurrent Protection .......................... 47
2.8 Inverse-Time Overcurrent Protection (ANSI 51V) ................................................................ 48
2.8.1 Functional Description .......................................................................................................... 48
2.8.2 Setting Hints ......................................................................................................................... 52
2.8.2.1 Settings of the Inverse O/C Time Protection ........................................................................ 53
2.8.2.2 Information for the Inverse-Time Overcurrent Protection ..................................................... 54
2.9 Thermal Overload Protection (ANSI 49) ............................................................................... 55
2.9.1 Functional Description .......................................................................................................... 55
2.9.2 Setting Hints ......................................................................................................................... 59
2.9.2.1 Thermal Overload Protection Settings.................................................................................. 63
2.9.2.2 Information List for the Thermal Overload Protection ........................................................... 64
2.10 Unbalanced Load (Negative Sequence) Protection (ANSI 46)............................................. 65
2.10.1 Functional Description .......................................................................................................... 65
2.10.2 Setting Hints ......................................................................................................................... 67
2.10.2.1 Settings of the Unbalanced Load Protection ........................................................................ 69
2.10.2.2 Information for the Unbalanced Load Protection .................................................................. 70
2.11 Startup Overcurrent Protection (ANSI 51) ............................................................................ 71
2.11.1 Functional Description .......................................................................................................... 72
2.11.2 Setting Hints ......................................................................................................................... 72
2.11.2.1 Settings of the Startup Overcurrent Protection ..................................................................... 74
2.11.2.2 Information for the Startup Overcurrent Protection............................................................... 74
2.12 Differential Protection (ANSI 87G/87M/87T)......................................................................... 75
2.12.1 Functional Description .......................................................................................................... 75
2.12.1.1 Protected Object Generator or Motor: Particularities............................................................ 77
2.12.1.2 Protected Object Transformer: Particularities....................................................................... 78
2.12.1.3 Evaluation of Measured Quantities....................................................................................... 81
2.12.2 Setting Hints ......................................................................................................................... 89
2.12.2.1 Differential Protection for Generators and Motors ................................................................ 89
2.12.2.2 Differential Protection for Transformers................................................................................ 91
2.12.2.3 Settings of the Differential Protection ................................................................................... 95
2.12.2.4 Information for the Differential Protection ............................................................................. 96
2.13 Earth Current Differential Protection (ANSI 87GN, TN)........................................................ 98
2.13.1 Functional Description .......................................................................................................... 98
2.13.2 Setting Hints ....................................................................................................................... 103
2.13.2.1 Settings of the Earth Current Differential Protection........................................................... 105
2.13.2.2 Information for the Earth Current Differential Protection..................................................... 105
2.14 Underexcitation (Loss-of-Field) Protection (ANSI 40)......................................................... 106
2.14.1 Functional Description ........................................................................................................ 106
2.14.2 Setting Hints ....................................................................................................................... 109
2.14.2.1 Settings of the Underexcitation (Loss-of-Field) Protection ................................................. 113
2.14.2.2 Information for the Underexcitation (Loss-of-Field) Protection .......................................... 114
2.15 Reverse Power Protection (ANSI 32R)............................................................................... 115
2.15.1 Functional Description ........................................................................................................ 115
2.15.2 Setting Hints ....................................................................................................................... 116