Functions
This chapter describes the numerous functions available on the SIPROTEC 4 device 7SJ80. It shows the setting
possibilities for each function in maximum configuration. Information with regard to the determination of
setting values as well as formulas, if required, are also provided.
Based on the following information, it can also be determined which of the provided functions should be
used.
2.1 General 30
2.2 Overcurrent Protection 50, 51, 50N, 51N 56
2.3 Directional Overcurrent Protection 67, 67N 82
2.4 Dynamic Cold Load Pickup 106
2.5 Single-Phase Overcurrent Protection 112
2.6 Voltage Protection 27, 59 122
2.7 Negative Sequence Protection 46 132
2.8 Frequency Protection 81 O/U 138
2.9 Undervoltage-controlled reactive power protection (27/Q) 142
2.10 Thermal Overload Protection 49 147
2.11 Monitoring Functions 154
2.12 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s) 172
2.13 Intermittent Ground Fault Protection 198
2.14 Dir. Intermittent earth fault protection 204
2.15 Automatic Reclosing System 79 209
2.16 Fault Locator 232
2.17 Breaker Failure Protection 50BF 235
2.18 Flexible Protection Functions 242
2.19 Reverse-Power Protection Application with Flexible Protection Function 253
2.20 Synchrocheck 261
2.21 Phase Rotation 274
2.22 Function Logic 275
2.23 Auxiliary Functions 277
2.24 Breaker Control 299
2.25 Notes on Device Operation 309
2
SIPROTEC 4, 7SJ80, Manual 29
E50417-G1140-C343-A8, Edition 12.2017
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