ABB RER620 Technical Manual page 394

Section 7
Measurement functions
388
Figure 208: Integral deadband supervision
The deadband value used in the integral calculation is configured with the X deadband
setting. The value represents the percentage of the difference between the maximum and
minimum limit in the units of 0.001 percent * seconds.
The reporting delay of the integral algorithms in seconds is calculated with the formula:
− ×
(max min) deadband
=
t s ( )
Δ ×
Y 100 %
Example for IA, IB, IC:
A deadband = 2500 (2.5% of the total measuring range of 40)
I_INST_A = I_DB_A = 0.30
If I_INST_A changes to 0.40, the reporting delay is:
− ×
( 40 0 ) 2500 1000 /
=
t s ( )
− ×
0 40 0 30 100 . . %
/ 1000
=
10 s
1MAC309294-MB F
(Equation 43)
RER620
Technical Manual