Functions
This chapter describes the individual functions of the SIPROTEC 4 device 7UT6x. It shows the setting possibili-
ties for each function in maximum configuration. Guidelines for establishing setting values and, where
required, formulae are given.
Based on the following information, it can also be determined which of the provided functions should be
used.
2.1 General 28
2.2 Differential Protection 92
2.3 Restricted Earth Fault Protection 125
2.4 Time Overcurrent Protection for Phase and Residual Currents 136
2.5 Time Overcurrent Protection for Earth Current 161
2.6 Dynamic Cold Load Pickup for Time Overcurrent Protection 172
2.7 Single-Phase Time Overcurrent Protection 177
2.8 Unbalanced Load Protection 187
2.9 Thermal Overload Protection 200
2.10 RTD-Boxes for Overload Detection 211
2.11 Overexcitation Protection 218
2.12 Reverse Power Protection 224
2.13 Forward Power Supervision 229
2.14 Undervoltage Protection 233
2.15 Overvoltage Protection 236
2.16 Frequency Protection 239
2.17 Circuit Breaker Failure Protection 244
2.18 External Trip Commands 251
2.19 Monitoring Functions 254
2.20 Function Control 271
2.21 Disconnection of Measuring Locations 273
2.22 Auxiliary Functions 276
2.23 Average Values, Minimum and Maximum Values 301
2.24 Command Processing 303
2
SIPROTEC 4, 7UT6x, Manual 27
C53000-G1176-C230-5, Edition 09.2016
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General
