ABB Relion 611 Series, Technical Manual

Page: 362 / 536

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Figure 173: 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 x seconds.
The reporting delay of the integral algorithms in seconds is calculated with the
formula:
t s
deadband
Y
( )
(max min) /
%
=
− ×
×
1000
100
∆
GUID-5381484E-E205-4548-A846-D3519578384B V1 EN
(Equation 34)
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 s ( )
( ) /
. . %
=
− ×
− ×
=
40 0 2500 1000
0 40 0 30 100
10
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Table 399: Parameters for deadband calculation
Function Settings Maximum/minimum (=range)
Three-phase current
measurement (CMMXU)
A deadband 40/0 (=40xIn)
Three-phase voltage
measurement (VMMXU)
V Deadband 4/0 (=4xUn)
Residual current measurement
(RESCMMXU)
A deadband res 40/0 (=40xIn)
Residual voltage measurement
(RESVMMXU)
V deadband res 4/0 (=4xUn)
Table continues on next page
Section 7
1MRS757454 D
Measurement functions
356 611 series
Technical Manual