ABB Relion 670 series, Technical Reference Manual

Page: 907 / 1232

absolute values of these integral values are added until the pre-set value is exceeded.
This occurs with the value Y2 that is reported and set as a new base for the following
measurements (as well as for the values Y3, Y4 and Y5).
The integral dead-band supervision is particularly suitable for monitoring signals with
small variations that can last for relatively long periods.
99000530.vsd
Y
t
Value Reported
(1st)
Y1
Value
Reported
A1 Y2
Value
Reported
Y3
Y4
A
Value
Reported
A2
Y5
A3
A4
A5
A7
A6
Value
Reported
A2 >=
pre-set value
A1 >=
pre-set value
A >=
pre-set value
A3 + A4 + A5 + A6 + A7 >=
pre-set value
IEC99000530 V1 EN
Figure 455: Reporting with integral dead-band supervision
15.1.2.2 Measurements CVMMXN
Mode of operation
The measurement function must be connected to three-phase current and three-phase
voltage input in the configuration tool (group signals), but it is capable to measure and
calculate above mentioned quantities in nine different ways depending on the available
VT inputs connected to the IED. The end user can freely select by a parameter setting,
which one of the nine available measuring modes shall be used within the function.
Available options are summarized in the following table:
1MRK505222-UUS C
Section 15
Monitoring
901
Technical reference manual