Setting Notes - Siemens SIPROTEC 7SK80 Manual
Motor protection
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Figure 2-15
2.2.10
Setting Notes
General
When selecting the time overcurrent protection in DIGSI, a dialog box appears with several tabs for setting the
individual parameters. Depending on the functional scope specified during configuration of the protective func-
tions under addresses 112 Charac. Phase and 113 Charac. Ground, the number of tabs can vary. If
address FCT 50/51 was set to Definite Time, or Charac. Ground was set to Definite Time, then
only the settings for the definite time elements are available. The selection of TOC IEC or TOC ANSI makes
available additional inverse time characteristics. The superimposed high-set elements 50-2, 50-3 or 50N-2,
50N-3 are available in all these cases.
Parameter 250 50/51 2-ph prot can also be set to activate two-phase overcurrent protection.
Under address 1201 FCT 50/51, overcurrent protection for phases and under address 1301 FCT 50N/51N,
the ground overcurrent protection can be switched ON or OFF.
Pickup values, time delays, and Curves for ground protection are set separately from the pickup values, time
delays and characteristic curves associated with phase protection. Because of this, relay coordination for
ground faults is independent of relay coordination for phase faults, and more sensitive settings can often be
applied to directional ground protection.
Depending on the setting of parameter 251 CT Connect., the device can also be used in specific system
configuration with regard to current connections. Further information can be found under Section 2.1.3.2, „Cur-
rent Connections".
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A4, Release date 08.2010
Reverse interlocking protection scheme
2.2 Overcurrent Protection 50, 51, 50N, 51N
Functions
69
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