Application - ABB REB670 Applications Manual

Section 14
Monitoring
14.1.2
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402

Application

Measurement functions are used for power system measurement, supervision and
reporting to the local HMI, monitoring tool within PCM600 or to station level for
example, via IEC 61850. The possibility to continuously monitor measured values of
active power, reactive power, currents, voltages, frequency, power factor etc. is vital for
efficient production, transmission and distribution of electrical energy. It provides to the
system operator fast and easy overview of the present status of the power system.
Additionally, it can be used during testing and commissioning of protection and control
IEDs in order to verify proper operation and connection of instrument transformers (CTs
and VTs). During normal service by periodic comparison of the measured value from the
IED with other independent meters the proper operation of the IED analog measurement
chain can be verified. Finally, it can be used to verify 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.
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.
Main menu/Measurement/Monitoring/Service values/CVMMXN
The measurement function, CVMMXN, provides the following power system quantities:
• P, Q and S: three phase active, reactive and apparent power
• PF: power factor
• V: phase-to-phase voltage magnitude
• I: phase current magnitude
• F: power system frequency
The measuring functions CMMXU, VMMXU and VNMMXU provide physical
quantities:
• I: phase currents (magnitude and angle) (CMMXU)
• V: voltages (phase-to-ground and phase-to-phase voltage, magnitude and angle)
(VMMXU, VNMMXU)
1MRK 505 337-UUS -
Application manual