Basler BE1-CDS220, Instruction Manual, Page: 344 / 476

13-30 Testing And Maintenance BE1-CDS220
1 2 3 4 5
RESTRAINT CURRENT (IN MULTIPLES OF TAP)
O
PERAT
IN
G
CURRENT
(I
N MULT
IP
LES O
F
T
AP)
123
minimum pickup
= 0.10 x tap
Differential
current
Slope =
I
OP
*100/I
RESTR
= 15%
0.
1
D2857-12.vsd
10-13-99
Figure 13-12. Minimum Pickup Characteristic
Step 5. Verify that pickup occurred within the specified accuracy of the relay (see Table 13-15) as
indicated by the low and high limits in Table 13-16.
Table 13-15. Sensing Input Type Accuracy
CT secondary rating Accuracy
5 A
±
4% of setting or 75 milliamperes whichever is greater
1 A
±
4% of setting or 25 milliamperes whichever is greater
Step 6. Decrease the phase A, input 1 current until the relay drops out. Remove current.
NOTE
Testing all inputs at various sensitivity settings is optional.