GE Multilin 750/760 Feeder Management Relay 4-15
4 USER INTERFACES 4.2 750/760PC SOFTWARE INTERFACE
4
4.2.7 ADVANCED 750/760PC FEATURES
a) WAVEFORM CAPTURE (TRACE MEMORY)
The 750/760PC software can be used to capture waveforms (or view trace memory) from the 750/760 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: I
a
, I
b
, I
c
, I
g
, I
sg
, V
a
, V
b
, V
c
, and V
s
, as well as digital data for the output relays and contact
input states.
1. With 750/760PC 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 750/760 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.
Figure 4–6: GRAPH ATTRIBUTE WINDOW
4. Click Save to store these graph attributes, then click OK to close the window.
5. The Waveform Capture window will reappear with the selected graph attributes available for use. Select the graphs to
display by checking the appropriate checkboxes in the Legend (see diagram below).
6. The Save button stores the current image on the screen to a CSV (comma delimited) file, and Open recalls saved
waveforms in CSV format. Waveform captures can also be printed from this window.
Courtesy of NationalSwitchgear.com
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