ABB Relion 670 Series Applications Manual page 106

Section 6
Wide area measurement system
U
TRM
I
U
TRM
I
I/P
MIM
BIM
IEC140000146 V2 EN-US
Figure 38: Overview of reporting functionality (PMUREPORT)
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.
6.2.3.1 Frequency reporting
By using patented algorithm the IED 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 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
100
MU
SMAI
SMMI
MEAS.
OR
PROTECTION
OP
GPS /
IRIG-B
UP
OC
PPS time data
UV
© Copyright 2017 Hitachi Power Grids. All rights reserved
U/I samples
PMUREPORT1
PHASOR1
PHASOR2
IEEEC37.118 / 1344
messages
PHASOR32
ANALOG1
ANALOG2
ANALOG24
BINARY1
BINARY2
BINARY24
FREQTRIG
DFDTTRIG
MAGHIGHTRIG
MAGLOWTRIG
1MRK 511 401-UEN Rev. K
8 TCP
NUM
6 UDC
IEC140000146-1-en.vsd
GUID-4F3BA7C7-8C9B-4266-9F72-AFB139E9DC21 v2
Bay control REC670
Application manual