Rockwell Automation 865 Differential Protection Relay - Manual (Page 79)

Protection Functions 3-35
865-UM001A-EN-P – July 2009
Table 3.21 – Maximum Secondary Scaling Settings
RATED INPUT
Maximum secondary scaled setting enabling
inverse delay times up to 20x setting
Order code I L I’ L I 01 I 02 I L1 , I L2 , I L3
& I 0Calc
I’ L1 , I’ L2 , I’ L3
& I’ 0Calc
I 01 I 02
Allen-Bradley 865-1_ 1 1 2.5 A 2.5 A
Allen-Bradley 865-3_ 1 5 2.5 A 12.5 A
Allen-Bradley 865-4_ 5 1 12.5 A 2.5 A
Allen-Bradley 865-5_ 5 5 12.5 A 12.5 A
Allen-Bradley 865-_A 5 5 1.25 A 1.25 A
Allen-Bradley 865-_B 5 1 1.25 A 0.25 A
Allen-Bradley 865-_C 1 5 0.25 A 1.25 A
Allen-Bradley 865-_D 1 1 0.25 A 0.25 A
Standard Inverse Delays IEC, IEEE, IEEE2, RI
The available standard inverse delays are divided in four categories
IEC, IEEE, IEEE2 and RI called delay curve families. Each category
of family contains a set of different delay types according to the
following table.
Inverse Time Setting Error Signal
The inverse time setting error signal will be activated, if the delay
category is changed and the old delay type doesn't exist in the new
category.
Limitations
The minimum definite time delay start latest, when the measured
value is twenty times the setting. However, there are limitations at
high setting values due to the measurement range.