Functions
264
7UM62 Manual
C53000-G1176-C149-3
The measured values for power P, Q and
∆
P, as well as the phase angle, can be either
positive or negative. Where the monitoring is for a negative threshold value, the num-
ber line definition applies (–10 is smaller than –5).
Example:
The measured quantity P (active power) is allocated to MV1> and set to –5 %.
If the actual measured value is higher than –5 % (e.g. –4 % or even +100 %), the in-
dication “
” is output as a logical “1”, which means a pickup in terms
of protection engineering. A dropout signal (indication “
” logical “0”)
is output if the measured value drops to less than –5 %
⋅
1.05 = –5.25 %.
With the measured quantity P allocated to MV2<, the monitoring checks whether the
value drops below the threshold.
A pickup signal is output in that case if the measured value becomes less than –5 %
(e.g. –8 %). The dropout value is at –5 %
⋅
0.95 = –4.75 %.
Further Processing
of Indications
The indications of the 6 measured value monitoring blocks (see list of information) are
available in the configuration matrix for further logical processing by the CFC (see
System Manual, Chapter 5).
2.40.2.1 Settings of the Threshold Supervision
Note:
The measured values U1, U2, I0, I1 and I2 are always greater than 0. Care should be
taken here to use only positive threshold values which allow the indication to drop out.
When defining the power angle
ϕ
, it should be kept in mind that this angle is only de-
fined for ± 100 % (equivalent to ± 180°) or less. The threshold value should be chosen
accordingly, taking into account the dropout ratio.
Addr.
Setting Title
Setting Options
Default Setting
Comments
8501
MEAS. VALUE 1>
Disabled
Active Power P
Reactive Power Q
Change of Active Power
Delta P
Positive Sequence Voltage
U1
Negative Sequence Voltage
U2
Zero Sequence Current I0
Positive Sequence Current
I1
Negative Sequence Current
I2
Power Angle PHI
Disabled
Measured Value for Threshold
MV1>
8502
THRESHOLD MV1> -200..200 %
100 %
Pickup Value of Measured Value
MV1>
