ABB RELION REX640 Technical Manual page 1299

1MRS759142 C
REX640
Technical Manual
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:
( 40 0 ) 2500 1000 /
− ×
t s ( )
=
0 40 0 30 100 . . %
− ×
GUID-D1C387B1-4F2E-4A28-AFEA-431687DDF9FE V1 EN
Table 1211: Parameters for deadband calculation
Function
Three-phase current
measurement (CMMXU)
Three-phase voltage
measurement (VMMXU)
Single-phase voltage
measurement (VAMMXU)
Residual current measurement
(RESCMMXU)
Residual voltage measurement
(RESVMMXU)
Frequency measurement
(FMMXU)
Phase sequence current
measurement (CSMSQI)
Phase sequence voltage
measurement (VSMSQI)
Three-phase power and energy
measurement (PEMMXU)
In the three-phase power and energy measurement function
PEMMXU, the deadband supervision is done separately for the
apparent power S, and the power factor PF. These deadbands are fixed
and linear in the following way:
• A change of 10% x Sn is reported in one second.
• An absolute change of 0.1 in the PF value (-1..0..+1) is reported
in one second.
All the power measurement-related values (P, Q, S and PF) are
reported simultaneously each time either S or PF causes a reporting.
10 s
=
Settings
A deadband
V Deadband
V Deadband
A deadband res
V deadband res
F deadband
Ps Seq A deadband, Ng Seq A
deadband, Zro A deadband
Ps Seq V deadband, Ng Seq V
deadband, Zro V deadband
-
Section 8
Measurement functions
Maximum/minimum (=range)
40/0 (=40xIn)
4/0 (=4xUn)
4/0 (=4xUn)
40/0 (=40xIn)
4/0 (=4xUn)
75/35 (=40 Hz)
40/0 (=40xIn)
4/0 (=4xUn)
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