The TRM modules are individually AC-calibrated in the factory. The calibration data is
stored in the prepared area of the TRM EEProm. The pre-processor block is extended with
calibration compensation and a new angle reference method based on timestamps. The
AI3P output of the preprocessor block is used to provide the required information for each
respective PMUREPORT phasor channel. More information about preprocessor block is
available in the section
Signal matrix for analog inputs SMAI
.
6.2.7.1
Frequency reporting
By using patented algorithm RES670 (or any other product from 670 series) can track the
power system frequency in quite wide range from 9 Hz to 95 Hz. In order to do that, the
three-phase voltage signal shall be connected to the IED. Then IED can adapt its filtering
algorithm in order to properly measure phasors of all current and voltage signals
connected to the IED. This feature is essential for proper operation of the PMUREPORT
function or for protection during generator start-up and shut-down procedure.
This adaptive filtering is ensured by proper configuration and settings of all relevant pre-
processing blocks, see "RES670 Application Manual/Signal matrix for analog inputs
SMAI/Setting guidelines". Note that in all preconfigured RES670 IEDs such
configuration and settings are already made and the three-phase voltage are used as master
for frequency tracking. With such settings RES670 will be able to properly estimate the
magnitude and the phase angle of measured current and voltage phasors in this wide
frequency range.
One of the important functions of a PMU is reporting a very accurate system frequency to
the PDC client. In RES670, each of the PMUREPORT instances is able to report an
accurate frequency. Each voltage-connected preprocessor block (SMAI block) delivers
the frequency data, derived from the analog input AC voltage values, to the respective
voltage phasor channel. Every phasor channel has a user-settable parameter
(
PhasorXUseFreqSrc
) to be used as a source of frequency data for reporting to the PDC
client. It is very important to set this parameter to On for the voltage-connected phasor
channels. There is an automatic frequency source selection logic to ensure an
uninterpreted reporting of the system frequency to the PDC client. In this frequency
source selection logic, the following general rules are applied:
•
Only the voltage phasor channels are used
•
The phasor channel with a lower channel number is prioritized to the one with a
higher channel number
As a result, the first voltage phasor is always the one delivering the system frequency to
the PDC client and if, by any reason, this voltage gets disconnected then the next available
voltage phasor is automatically used as the frequency source and so on. If the first voltage
phasor comes back, since it has a higher priority compare to the currently selected phasor
channel, after 500 ms it will be automatically selected again as the frequency source.
1MRK 511 365-UUS A
Section 6
Wide area measurement system
Phasor measurement unit RES670 2.1 ANSI
139
Technical manual
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