Siemens SIPROTEC 7ST6, Manual, Page: 25 / 356

25
7ST6 Manual
E50417-G1176-C251-A3
Functions
2
This chapter describes the individual functions of the SIPROTEC 4 device 7ST6. It
shows the setting possibilities for each function in maximum configuration. Guidelines
for establishing setting values and, where required, formulae are given.
Additionally, on the basis of the following information, it may be defined which func-
tions are to be used.
2.1 General 26
2.2 Distance Protection 47
2.3 Overcurrent Protection 76
2.4 High-Speed Overcurrent Protection 84
2.5 Emergency Overcurrent Protection 87
2.6 Overvoltage and Undervoltage Protection 90
2.7 Thermal Overload Protection 94
2.8 Circuit Breaker Failure Protection 103
2.9 Trip Supervision 109
2.10 Defrosting Protection 111
2.11 InRush Restraint 120
2.12 Automatic Reclosure Function 124
2.13 Synchronism and Voltage Check 142
2.14 Fault Locator 152
2.15 It Function (current-time integral) 156
2.16 Monitoring Function 166
2.17 Trip Circuit Supervision 170
2.18 Protection Function Control 174
2.19 Auxiliary Functions 186
2.20 Command Processing 194
2.21 Use in auto-transformer systems 205
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