Conclusion
This analysis showed three measurements of the
SF
value. The third version, using the C-class of the CT
and including the CT internal resistance in the voltage drop calculations is used to determine CT
saturation measurements in the calculations for the relay.
Setting Note 4. Slope Setting when CT Saturation Factor (SF) > 0.5
In this case, the maximum slope is set to 60 percent (S = 60). This occurs when poor CTs are used. This
situation should be avoided if possible, since no accurate calculations can be made to verify the security
of the protection.
The effect of this setting is illustrated in the following hypothetical case, where it can be seen that the
slope based on the linear operation may be too low when severe saturation occurs.
Figure D-12. I
R
in Multiples of TAP
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BE1-CDS240 Settings Calculations
D-27
Summary of Contents for BE1-CDS240
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Page 349: ...Figure 12 5 Horizontal Rack Mount Front View 9365200990 Rev F BE1 CDS240 Installation 12 5 ...
Page 361: ...Figure 12 17 Typical DC Connection Diagrams 9365200990 Rev F BE1 CDS240 Installation 12 17 ...
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