Section 12
Monitoring
12.1
Measurements
12.1.1
Functionality
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 505 277-UUS C
Section 12
Monitoring
217
Technical Manual
Summary of Contents for REB650
Page 1: ...Relion 650 series Busbar protection REB650 ANSI Technical Manual ...
Page 2: ......
Page 34: ...28 ...
Page 52: ...46 ...
Page 128: ...122 ...
Page 150: ...144 ...
Page 192: ...186 ...
Page 222: ...216 ...
Page 360: ...354 ...
Page 378: ...372 ...
Page 437: ...IEC12000585 V1 EN 1MRK 505 277 UUS C Section 16 IED physical connections 431 Technical Manual ...
Page 438: ...IEC12000586 V1 EN Section 16 1MRK 505 277 UUS C IED physical connections 432 Technical Manual ...
Page 439: ...IEC12000587 V1 EN 1MRK 505 277 UUS C Section 16 IED physical connections 433 Technical Manual ...
Page 440: ...IEC12000588 V1 EN Section 16 1MRK 505 277 UUS C IED physical connections 434 Technical Manual ...
Page 441: ...IEC12000589 V1 EN 1MRK 505 277 UUS C Section 16 IED physical connections 435 Technical Manual ...
Page 442: ...IEC12000590 V1 EN Section 16 1MRK 505 277 UUS C IED physical connections 436 Technical Manual ...
Page 443: ...IEC12000591 V1 EN 1MRK 505 277 UUS C Section 16 IED physical connections 437 Technical Manual ...
Page 444: ...IEC12000592 V1 EN Section 16 1MRK 505 277 UUS C IED physical connections 438 Technical Manual ...
Page 454: ...448 ...
Page 503: ...497 ...