ABB Relion 670 Series Applications Manual page 107

1MRK 511 401-UEN Rev. K
channel. Every phasor channel has a user-settable parameter (
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 16:
Name
TIMESTAT
FREQ
FREQGRAD
FREQREFCHSEL
FREQREFCHERR
FREQTRIG
DFDTTRIG
MAGHIGHTRIG
MAGLOWTRIG
6.2.3.2 Reporting filters
The PMUREPORT function block implements the reporting filters designed to avoid aliasing as
the reporting frequency is lower than the sample/calculation frequency. This means, the
synchrophasor and frequency data which are included in the C37.118 synchrophasor streaming
data are filtered in order to suppress aliasing effects, as the rate of the C37.118 data is slower
than the data rate for internal processing. For this purpose, there is an anti-aliasing filter
designed for each reporting rate. The correct anti-aliasing filter will be automatically selected
based on the reporting rate and the performance class (P/M) settings. The filters are designed
to attenuate all aliasing frequencies to at least -40 dB (a gain of 0.01) at M class.
Bay control REC670
Application manual
PMUREPORT Monitored data
Type Values (Range)
BOOLEAN
REAL
REAL
INTEGER
BOOLEAN
BOOLEAN
BOOLEAN
BOOLEAN
BOOLEAN
© Copyright 2017 Hitachi Power Grids. All rights reserved
Unit
1=Ready -
0=Fail
- Hz
- -
- -
0=Freq ref not -
available
1=Freq ref error
2=Freq ref
available
- -
- -
- -
- -
Wide area measurement system
PhasorXUseFreqSrc ) to be used
PID-6244-MONITOREDDATA v2
Description
Time synchronization status
Frequency
Rate of change of frequency
Frequency reference channel number
selected
Frequency reference channel error
Frequency trigger
Rate of change of frequency trigger
Magnitude high trigger
Magnitude low trigger
GUID-D39153B5-81CE-4C1F-A816-C7A4C3407048 v2
Section 6
101