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556 D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
DATA LOGGER CHAPTER 11: METERING
same IRIG-B signal: either the same GPS receiver or IRIG-B generator. Otherwise, the
setpoints of the test set and the phasor measurement unit measurements should not be
compared as they are referenced to different time scales.
Figure 484: Testing synchrophasor measurement accuracy
Collecting synchronized measurements ad hoc
The phasor measurement unit one-shot feature can be used for ad hoc collection of
synchronized measurements in the network. Two or more phasor measurement units can
be pre-scheduled to freeze their measurements at the same time. When frozen the
measurements could be collected using EnerVista UR
Plus
Setup or a protocol client.
Data logger
The data logger samples and records up to 16 analog parameters at a user-defined
sampling rate. This recorded data may be downloaded to the EnerVista UR
Plus
Setup software and displayed with parameters on the vertical axis and time on the
horizontal axis. All data is stored in non-volatile memory, meaning that the information is
retained when power to the relay is lost.
For a fixed sampling rate, the data logger can be configured with a few channels over a
long period or a larger number of channels for a shorter period. The relay automatically
partitions the available memory for the channels in use.
Between the recording intervals, the data logger calculates the maximum, minimum, and
the average value of each channel. At the end of the interval either the maximum,
minimum, or average value is written to the data logger depending on the mode setting.
This ensures that data is not missed if a low rate setting is selected.
In addition, the maximum value, timestamp of maximum, minimum value, time stamp of
minimum are calculated for the channel for the duration of recording since the start of
recording. A high, low, high-high, and low-low alarm can be configured for each channel.
Data logger function configuration
Select the Settings > Metering > Data Logger > Function menu item to open the data
logger configuration window.
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