ABB REG670 Applications Manual page 118

Relion 670 series generator protection
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Section 6
Wide area measurement system
112
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 Signal matrix for analog inputs in the Application manual.
Note that in all preconfigured IEDs such configuration and settings are already made
and the three-phase voltage are used as master for frequency tracking. With such
settings the IED 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 the IED, 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 uninterrupted 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. There is also an output available on the component which shows if
the reference frequency is good, error or reference channel unavailable.
It is possible to monitor the status of the frequency reference channel (frequency
source) for the respective PMUREPORT instance on Local HMI under Test/
Function status/Communication/Station Communication/PMU Report/
PMUREPORT:1/Outputs, where the FREQREFCHSEL output shows the selected
channel as the reference for frequency and FREQREFCHERR output states if the
reference frequency is good, or if there is an error or if the reference channel is
unavailable. For more information refer to the table PMUREPORT monitored data.
Table 14:
PMUREPORT Monitored data
Name
Type
TIMESTAT
BOOLEAN
FREQ
REAL
FREQGRAD
REAL
Table continues on next page
Generator protection REG670 2.2 IEC and Injection equipment REX060, REX061, REX062
Values (Range)
Unit
1=Ready
-
0=Fail
-
Hz
-
-
1MRK 502 071-UEN -
Description
Time synchronization
status
Frequency
Rate of change of
frequency
Application manual

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