277UM61 Manual
C53000-G1176-C127-3
Functions 2
This chapter describes the numerous functions available on the SIPROTEC
®
4
7UM61. It shows the setting possibilities for all the functions in maximum configura-
tion. Instructions for deriving setting values and formulae, where required are provid-
ed.
Additionally it may be defined which functions are to be used.
2.1 Introduction, Reference Systems 29
2.2 Functional Scope 31
2.3 Power System Data 1 34
2.4 Change Group 39
2.5 Power System Data 2 40
2.6 Definite-Time Overcurrent Protection (I>, ANSI 50/51) with Undervoltage
Seal-In 42
2.7 Definite-Time Overcurrent Protection (I>>, ANSI 50, 51, 67) with Direction
Detection 46
2.8 Inverse-Time Overcurrent Protection (ANSI 51V) 52
2.9 Thermal Overload Protection (ANSI 49) 59
2.10 Unbalanced Load (Negative Sequence) Protection (ANSI 46) 70
2.11 Underexcitation (Loss-of-Field) Protection (ANSI 40) 77
2.12 Reverse Power Protection (ANSI 32R) 85
2.13 Forward Active Power Supervision (ANSI 32F) 89
2.14 Impedance Protection (ANSI 21) 92
2.15 Undervoltage Protection (ANSI 27) 103
2.16 Overvoltage Protection (ANSI 59) 106
2.17 Frequency Protection (ANSI 81) 109
2.18 Overexcitation (Volt/Hertz) Protection (ANSI 24) 113
2.19 Rate-of-Frequency-Change Protection df/dt (ANSI 81R) 118
2.20 Jump of Voltage Vector 123
2.21 90-%-Stator Earth Fault Protection (ANSI 59N, 64G, 67G) 128
2.22 Sensitive Earth Fault Protection (ANSI 51GN, 64R) 136
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