Application - ABB RELION RET670 Applications Manual

Section 18
Monitoring
18.1.2
,
864

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 from 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:
1MRK 504 163-UUS A
Transformer protection RET670 2.2 ANSI
Application manual
SEMOD54488-4 v12