ABB RELION REX640 Technical Manual page 1298

Section 8
Measurement functions
1292
Function
Phase sequence voltage measurement
(VSMSQI)
Three-phase power and energy
measurement (PEMMXU)
Deadband supervision
The deadband supervision function reports the measured value according to
integrated changes over a time period. In
Y1, Y2, Y3 and Y4. There is no value report at the end of |A3 + A4 + A5 + A6 + A7|
because the positive and negative areas counteract each other. The integrated changes,
|A3 + A4 + A5 + A6 + A7|, equal approximately zero.
Y
A1 >= pre-set value
A >=pre-set value
Y2
Value Reported
(1st)
A
Y1
GUID-539672B5-CA8B-4A83-9FA7-43FA8CC3490A V1 EN
Figure 701: 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:
(max min)
deadband
− ×
( )
t s
=
Y 100 %
∆ ×
GUID-5381484E-E205-4548-A846-D3519578384B V1 EN
Settings for limit value supervision
High limit
Low limit
High-high limit
Low-low limit
High limit
Low limit
High-high limit
Low-low limit
Figure 701
A2 >= pre-set value
Y3
A1
Y4
Value
Value
Reported
Value
Reported
Reported
/ 1000
1MRS759142 C
Ps Seq V high limit, Ng Seq
V high limit, Zro V high limit
Ps Seq V low limit, Ng Seq V
low limit, Zro V low limit
Ps Seq V Hi high Lim, Ng
Seq V Hi high Lim, Zro V Hi
high Lim
Ps Seq V low low Lim, Ng
Seq V low low Lim, Zro V low
low Lim
-
-
-
-
the values are reported at points
A3 + A4 + A5 + A6 + A7+... ≈ 0
A2
A4
A6
A5
A7
A3
Technical Manual
t
(Equation 303)
REX640