proper direction orientation for distance or directional overcurrent protection
function.
The available measured values of an IED are depending on the actual
hardware (TRM) and the logic configuration made in PCM600.
All measured values can be supervised with four settable limits that is, low-low limit,
low limit, high limit and high-high limit. A zero clamping reduction is also supported,
that is, the measured value below a settable limit is forced to zero which reduces the
impact of noise in the inputs. There are no interconnections regarding any settings or
parameters, neither between functions nor between signals within each function.
Zero clampings are handled by
ZeroDb
for each signal separately for each of the
functions. For example, the zero clamping of U12 is handled by
ULZeroDb
in
VMMXU, zero clamping of I1 is handled by
ILZeroDb
in CMMXU.
Dead-band supervision can be used to report measured signal value to station level
when change in measured value is above set threshold limit or time integral of all
changes since the last time value updating exceeds the threshold limit. Measure value
can also be based on periodic reporting.
The measurement function, CVMMXN, provides the following power system
quantities:
•
P, Q and S: three phase active, reactive and apparent power
•
PF: power factor
•
U: phase-to-phase voltage amplitude
•
I: phase current amplitude
•
F: power system frequency
The output values are displayed in the local HMI under
Main menu/Tests/Function
status/Monitoring/CVMMXN/Outputs
The measuring functions CMMXU, VNMMXU and VMMXU provide physical
quantities:
•
I: phase currents (amplitude and angle) (CMMXU)
•
U: voltages (phase-to-earth and phase-to-phase voltage, amplitude and angle)
(VMMXU, VNMMXU)
It is possible to calibrate the measuring function above to get better then class 0.5
presentation. This is accomplished by angle and amplitude compensation at 5, 30 and
100% of rated current and at 100% of rated voltage.
The power system quantities provided, depends on the actual
hardware, (TRM) and the logic configuration made in PCM600.
Section 12
1MRK 505 291-UEN A
Monitoring
262
Application manual
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