Siemens siprotec SJ62 User Manual page 328

SIPROTEC 4, 7SJ62/63/64 Handbuch
C53000-G1140-C147-A, Edition 07.2015
Note
Since a directional coefficient of m < -4 is technically irrelevant, but could theoretically
be the result of incorrect settings, it is limited to -4. If a coefficient is smaller than -4,
the exponential function in the operating cycles diagram is deactivated. The maximum
number of operating cycles with Isc (263 OP.CYCLES Isc) is used instead as the
calculation result for the current number of operating cycles, see Figure 2-119.
Figure 2-119 Value limitation of directional coefficient
With the characteristics description, you can calculate the actual remaining lifetime
after each tripping.
2.23 Auxiliary Functions
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