Quick start manual

STER PMU Quick Start Manual Using the Wamster web interface
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6.4 DEVICE COMPARATION
To compare measurements of your devices, use the Compare page, accessible from the navigation menu:
Figure 6.6: Measurement comparison page allows real-time and historical comparison
Left part of the page shows a map with geographical locations of your instruments (as reported by their GPS
devices). Each device balloon shows voltage (blue) and current (red) absolute symmetry components, which rotate
as the data is received. When more than two devices are connected, red dashed lines indicate which of the devices
is set as the reference device for comparison.
Central panel contains a table of devices with actual measurements: absolute current and voltage synchrophasor
measurements (positive symmetry components (U+, I+), as well as their relative (U+, I+) angles (compared to
the selected reference device). Each device entry also displays a visual gauge indicator, showing the relative
phasor angle difference (with a fixed range of -
, the gauge is not rescaled to keep the same scale as
other devices. This means that if the gauge is "floored", it may actually represent a difference outside this
range.
6.4.1 SETTING THE REFERENC E DEVICE FOR COMPARI SON
By clicking on a specific device balloon on the map, or the same device in the central panel, the device is selected
as a reference device, which is indicated by a red border around the device, as shown below:
Figure 6.7: Clicking on a device sets is as the reference device,
which is indicated with a red border.