Special Variant Function 50-1, 50N-1 For Service Interlocking - Siemens 7SC80 Manual

Functions
2.2 Overcurrent Protection 50, 51, 50N, 51N
[7sjx_logic_51-phase, 1, en_US]
Figure 2-17
2.2.7

Special Variant Function 50-1, 50N-1 for Service Interlocking

The time overcurrent protection function provides one independent stage each for phase and ground specif-
ically for the duration of an active service interlocking. Use addresses 1270 50 HLT PICKUP, 1271 50 HLT
DELAY for the phase and 1370 50N HLT PICKUP, 1371 50N HLT DELAY for the parameterization of the
ground element. When service interlocking is inactive, these 2 elements are blocked. This is also signaled by
the indication 6090
the blocking of this element is reset.
The following figure applies analogously also to the ground current.
84
Logic diagram of the voltage-restraint inverse-time overcurrent protection
50 HLT BLOCKED or 6094 50N HLT BLOCKED . When service interlocking is activated,
SIPROTEC Compact, 7SC80, Manual
E50417-G1140-C486-A8, Edition 07.2017