ABB RELION 650 SERIES, Applications Manual

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Function description IEC 61850
identification
IEC 60617
identification
ANSI/IEEE C37.2
device number
Current sequence component
measurement
CMSQI
I1, I2, I0
SYMBOL-VV V1 EN-US
-
Voltage sequence measurement VMSQI
U1, U2, U0
SYMBOL-TT V1 EN-US
-
Phase-neutral voltage measurement VNMMXU
U
SYMBOL-UU V1 EN-US
-
12.4.2 Application
SEMOD54488-4 v8
Measurement functions is 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. 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
VLZeroDB 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:
1MRK 505 287-UUS B Section 12
Monitoring
Busbar protection REB650 191
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