Siemens 7SK80 - Page 190

Functions
2.11 Ground Fault Protection 64, 67N(s), 50N(s), 51N(s)
SIPROTEC, 7SK80, Manual
E50417-G1140-C344-A5, Release date 11.2012
190
Figure 2-64 Logic diagram of the V
N
> element for cos-ϕ /sin-ϕ measurement