ABB RELION 620 Series Technical Manual page 931

1MRS757644 H
Figure 499: Integral deadband supervision
The deadband value used in the integral calculation is configured with the
deadband setting. The value represents the percentage of the difference between
the maximum and minimum limit in the units of 0.001 percent x seconds.
The reporting delay of the integral algorithms in seconds is calculated with the
formula:
t s ( )
Example for CMMXU:
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:
( )
t s
Table 890: Parameters for deadband calculation
Function
Three-phase current meas-
urement (CMMXU)
Three-phase voltage meas-
urement (VMMXU)
Residual current measure-
ment (RESCMMXU)
Residual voltage measure-
ment (RESVMMXU)
Table continues on the next page
620 series
Technical Manual
(max min) − × deadband
=
Y
∆ × 100 %
( 40 0 ) 2500 1000 /
− ×
10
= =
0 40 0 30 100 . . %
− ×
/ 1000
s
Settings
A deadband
V Deadband
A deadband res
V deadband res
Measurement functions
X
(Equation 177)
Maximum/minimum
(=range)
40/0 (=40xIn)
4/0 (=4xUn)
40/0 (=40xIn)
4/0 (=4xUn)
931