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Functions
This chapter describes the numerous functions available on the SIPROTEC 4 device 7SK80. 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
2.2
Overcurrent Protection 50, 51, 50N, 51N
2.3
Directional Overcurrent Protection Ground 67, 67N
2.4
Dynamic Cold Load Pickup
2.5
Voltage Protection 27, 59
2.6
Negative Sequence Protection 46
2.7
Motor Protection (Motor Starting Protection 48, Motor Restart Inhibit 66, Load Jam Protection) 128
2.8
Frequency Protection 81 O/U
2.9
Thermal Overload Protection 49
2.10
Monitoring Functions
2.11
Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
2.12
Intermittent Ground Fault Protection
2.13
Dir. Intermittent earth fault protection
2.14
Breaker Failure Protection 50BF
2.15
Flexible Protection Functions
2.16
Reverse-Power Protection Application with Flexible Protection Function
2.17
Temperature Detection via RTD Box
2.18
Phase Rotation
2.19
Function Logic
2.20
Auxiliary Functions
2.21
Command Processing
2.22
Notes on Device Operation
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
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87
103
109
120
150
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164
185
207
213
218
224
237
245
256
258
260
286
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