GE 489 - Manual (Page 46)

3-14 489 Generator Management Relay GE Multilin
3.2 SOFTWARE INTERFACE 3 USER INTERFACES
3
3.2.6 WAVEFORM CAPTURE
The 489PC software can be used to capture waveforms from the 489 at the instant of a trip. A maximum of 64 cycles can
be captured and the trigger point can be adjusted to anywhere within the set cycles. A maximum of 16 waveforms can be
buffered (stored) with the buffer/cycle trade-off.
The waveforms captured are: Phase Currents A, B, and C; Neutral Currents A, B, and C; Ground Current; and Phase Volt-
ages A-N, B-N, and C-N
1. With 489PC running and communications established, select the Actual > Waveform Capture menu item to open the
waveform capture window.
2. The phase A current waveform for the last 489 trip will appear. The date and time of the trip is displayed at the top of
the window. The red vertical line indicates the trigger point of the relay.
3. Press the Setup button to enter the Graph Attribute page. Program the graphs to be displayed with the pull-down menu
beside each graph description. Change the Color, Style, Width, Group#, and Spline selections as desired. Select the
same Group# to scale all parameters together.
4. Click Save to store these graph attributes, then click OK to close the window.
5. Select the graphs to display by checking the appropriate checkboxes.
6. The Save button stores the current image on the screen, and Open recalls a saved image. Print will copy the window
to the system printer.
Figure 3–8: WAVEFORM CAPTURE
808730A2.CDR
MODE SELECT
Click to view Cursor Lines 1, 2, or
Difference (Delta) values for the
graph
TRIGGER
Click to manually trigger
and capture waveforms DATE/TIME
Displays the date and time
of the trigger cause
TRIGGER CAUSE
Displays the cause of
the trigger
WAVEFORM
The relay
waveform data
LEVEL
Displays the
value of the
graph at the
solid cursor
line
CHECK BOX
Toggle the check boxes
to view desired graphs BUTTONS
Print, Help, Save (to save
graph to a file), Open (to
open a graph file), Zoom In
and Out CURSOR LINES
To move lines, move the mouse
pointer over the cursor line; hold
the left mouse button and drag the
cursor line to a new location