0.0
0.5
1.0
1.5
0.0
1.0
2.0
3.0
IB/In
ID_COSPHI/ In
ID
IB
TRIPPING
NON TRIPPING
Trip value
GUID-9D592151-7598-479B-9285-7FB7C09F0FAB-ANSI V1 EN
Figure 145:
Operating characteristics of the stabilized ground-fault protection
function
GUID-4BF3E289-E355-4C31-B87E-151DFDDCEBA8-ANSI V1 EN
Figure 146:
Setting range of the operating characteristics for the stabilized differential
current principle of the ground-fault protection function
The
Trip value
setting is used for defining the characteristics of the function. The
differential current value required for tripping is constant at the stabilizing current values
0.0 < IB/In < 1.0, where In is the nominal current, and the In in this context refers to the
nominal of the phase current inputs. When the stabilizing current is higher than 1.0, the
slope of the operation characteristic (ID/IB) is constant at 50 percent. Different operating
characteristics are possible based on the
Trip value
setting.
Section 4
1MRS240050-IB C
Protection functions
304
REF615R
Technical Manual
Summary of Contents for RELION REF615R
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