Application - Hitachi Relion 670 Series Applications Manual

Section 16
Monitoring
Function description
Current sequence component
measurement
Voltage sequence component
measurement
Phase-neutral voltage measurement
16.1.3

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.
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.
All measurement functions use fundamental frequency phasors (that is, DFT filtering) for internal
calculations and for reporting of measured values. However, from the following three measurement
functions CMMXU, VMMXU and VNMMXU it is also possible to report the total measured quantity (that
is, true RMS filtering). By selecting the RMS mode, the reported value will be in addition to the
fundamental magnitude also include harmonics.
Main menu /Measurement /Monitoring /Service values /CVMMXN
The measurement function, CVMMXN, provides the following power system quantities:
230
IEC 61850
identification
CMSQI
VMSQI
VNMMXU
The available measured values from an IED are depending on the actual hardware (TRM)
and the logic configuration made in PCM600.
© 2017 - 2023 Hitachi Energy. All rights reserved
IEC 60617 ANSI/IEEE C37.2
identification device number
-
I1, I2, I0
SYMBOL-VV V1 EN-US
-
U1, U2, U0
SYMBOL-TT V1 EN-US
-
U
SYMBOL-UU V1 EN-US
Phasor measurement unit RES670
1MRK511407-UUS Rev. N
SEMOD54488-4 v13
Application manual